Part-04 Unit Masonry

4
4.1
4.1.1
4.1.2
4.1.3
4.2
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.3
4.3.1
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.4
4.6
4.6.1
4.7
4.7.1
4.7.2
4.7.3
4.7.4
4.7.5
4.7.6
4.7.7
4.7.8
4.7.9
4.7.10
4.8
4.8.1
4.8.2
4.8.3
4.8.4
UNIT MASONRY...................................................................................................................... 2

general ..................................................................................................................................... 2 Scope 2 References 2 Definitions: 3
clay masonry units ................................................................................................................... 3 Clay Bricks 3 Clay Blocks 3 Classification of Clay Masonry Units 3 Requirements of Clay Masonry Units 3 Marking of Clay Blocks 5 Testing of Clay Blocks 5 Criteria of Technical Conformity of Clay Blocks 5
Calcium Silicate Bricks............................................................................................................. 6 General Requirements 6
concrete masonry units ............................................................................................................ 6 Concrete Blocks 6 Manufacture of Concrete Blocks 8 Block Dimensions 9 Precast Concrete Bricks 9
glass units .............................................................................................................................. 10 General Requirements 10 Submittals 10 Material Storage and Handling 10 Laying 10
gypsum units .......................................................................................................................... 11 General Requirements 11
STONE Work ......................................................................................................................... 11

General Requirements Anchorage Devices Mortar Fabrication Installation Wall Cladding Paving and Flooring Erection Tolerances Submittals Visual Mock-ups 11 11 12 12 12 13 13 14 14 14
CASt stone ............................................................................................................................. 15

General Requirements 15
Submittals 15
Product Delivery, Storage and Handling 15
Anchorage Devices 15

4 UNIT MASONRY
4.1 GENERAL
4.1.1 Scope
1 This Part specifies clay and concrete masonry units.
2 Approval from Qatar Standards shall be obtained for masonry units intended to be used in elements subject to thermal insulation.
3 Related Parts and Sections are as follows: This Section
Part 1 Part 2 Part 3 Part 5
Section 1 Section 5 Section 15

4.1.2 References
General Mortar And Grout Accessories Masonry Laying
General Concrete Thermal Insulation of Buildings
The following standards are referred to in this Part:
ASTM C270................Standard Specification for Mortar for Unit Masonry
ASTM C1364..............Standard Specification for Architectural Cast Stone

BS 187........................Calcium silicate bricks
BS 1217 .....................Cast stone
BS 6073-2 ..................Precast concrete masonry units. Guide for specifying precast concrete

masonry units BS EN 771 .................Specification for masonry units BS EN 772-2 ..............Methods of test for masonry units. Determination of percentage area
of voids in masonry units (by paper indentation) BS EN 771-3 ..............Specification for masonry units. Aggregate concrete masonry units (dense and light-weight aggregates) BS EN 771-5 ..............Specification for masonry units. Manufactured stone masonry units
EN 771-1 ....................Specification for masonry units. Clay masonry units
EN 771-2 ....................Specification for masonry units. Calcium silicate masonry units
EN 998-2 ....................Specification for mortar for masonry. Masonry mortar

PD 6678 .....................Guide to the specification of masonry mortar

4.1.3 Definitions:
1 Aggregate: granular material used in construction and may be natural, manufactured or recycled.
2 Natural aggregate: aggregate from mineral sources which has been subjected to nothing more than mechanical processing.
3 Manufactured aggregate: aggregate of mineral origin resulting from an industrial process involving thermal or other modification.
4 Recycled aggregate: aggregate resulting from the processing of inorganic material previously used in construction.
5 Lightweight aggregate: aggregate of mineral origin having a particle density not exceeding 2,000 kg/m3 or a loose bulk density not exceeding 1,200 kg/m3.

4.2 CLAY MASONRY UNITS
4.2.1 Clay Bricks
1 A clay brick is a masonry unit not exceeding 290 mm in length and 115 mm in height. 2 Semi-solid bricks are bricks having up to 25 % holes or cavities of their gross volume. 3 Cellular bricks contain the same voids as hollow bricks but with the cavities closed at one
end. 4 Clay bricks to conform to the requirement of EN 771-1.

4.2.2 Clay Blocks
1 A clay block is a masonry unit which exceeds in any of its normal dimensions the maximum dimensions given for clay bricks in Clause 4.2.1-1.

4.2.3 Classification of Clay Masonry Units
1 Units shall be classified as follows:
(a)
non-load-bearing blocks

(b)
blocks produced for use in non-load-bearing walls

(d)
blocks produced for use in load-bearing walls.

4.2.4 Requirements of Clay Masonry Units
1 Clay masonry units shall be of a uniform shape, free from surface cracks which decrease its properties. Its outer surface shall be serrated to increase the bonding force with the mortar. It should be well burnt, of a uniform texture and free from pebbles of lime.
2 The dimensions of the clay masonry blocks for walls to be as given in Table 4.1.

Table 4.1
Dimensions of Clay Masonry Blocks

Nominal Dimensions (mm) Actual Dimensions (mm)
Length Width Height Length Width Height
300 300 300 400 400 400 100 150 200 100 150 200 200 200 200 200 200 200 290 290 290 390 390 390 100 150 200 100 150 200 190 190 190 190 190 190

The tolerance in the actual dimensions of the blocks shall be ±4 %, provided that the difference between the largest actual dimension and the smallest one in the same consignment does not exceed 5 % as shown in Table 4.2.
Table 4.2
Dimensional tolerance

Dimension Size (mm) Permissible size (mm) Permissible difference between largest actual size and smallest one in one (consignment)
Largest Smallest
Length Width Height 390 290 200 150 190 406 302 208 156 198 375 278 192 144 182 20 15 10 7.5 10

4 Adjacent faces of the units are to be at right angles, and the tolerance of the squareness not to exceed 2 mm for each 100 mm length.
5 The faces should have a plain surface, and the tolerance not to exceed 5 mm from the straight line.
6 Water absorption of the units shall not exceed 25 % by weight for the individual block and 20 % by weight for the average of tested blocks.
7 The compressive strength of the units, calculated for the total area including holes shall not to be less than the limits shown in Table 4.3.
Table 4.3
Compressive Strength

Class of Block Minimum Value for Compressive Strength of One Block Minimum Average of the Compressive Strength
N/mm² (kg/cm²) N/mm² (kg/cm²)
Class 6 Class 12 6 12 (60) (120) 7.5 15 (75) (150)

4.2.5 Marking of Clay Blocks
1 Every clay block is to be marked with the name of the manufacturer and/or his registered mark.
2 The class of block should be shown on every load-bearing block.

4.2.6 Testing of Clay Blocks
1 The following tests are to be carried out on the representative sample taken according to Clause 4.2.6-3 of this Part:
(a)
appearance

(b)
dimensions

(d)
water absorption (optional)

2 Appearance and dimension tests are to be carried out on the same units that are to be tested for compressive strength and water adsorption. Appearance and dimension tests are to be carried out before the other referenced tests.
3 A representative sample is to be taken from the consignment not exceeding 15,000 blocks as shown in Table 4.4. As for consignments exceeding that number, one excess block is to be taken for each 1,000 additional blocks. The sample is to be taken at random during loading or unloading by dividing the consignment into a convenient number of real or imaginary sections. From each section, a corresponding number of units are to be taken, provided that the total number of samples units is equal as shown in Table 4.4.
Table 4.4
Sample Sizes

Number of units in consignment Number of units for each test
Appearance and size measurements (mandatory)
Compressive strength (mandatory) Water absorption (optional)
5,000 or less More than 5,000 and up to 10,000 More than 10,000 and up to 15,000 5 10 15 3 5 10

4 The methods of test for clay bricks shall be in accordance with the relevant provisions of EN 771-1.
4.2.7 Criteria of Technical Conformity of Clay Blocks
1 The consignment is to be accompanied with a certificate indicating its conformity with all the requirements of this standard.
2 The consignment is to be considered complying with this standard if the representative sample passes all the mandatory tests mentioned in this standard.

3 Compressive test : the consignment will be considered complying with this standard if the following two conditions are fulfilled:
(a)
each of the tested blocks meets the minimum limit of compressive strength mentioned in this standard

(b)
the tested blocks meet the minimum limit of the average compressive strength mentioned in this standard.

4 Water absorption : the consignment is to be considered complying with this standard if the following two conditions are fulfilled:
(a)
each tested block should meet the minimum limit of water absorption mentioned in this standard

(b)
the average water absorption for the tested blocks will meet the minimum limit of the average water absorption mentioned in this standard.

5 If the tested units do not comply with the requirements of the appearance, dimension and/or absorption tests, other units may be taken for testing. If these units do not pass the test(s), the consignment is to be considered non-complying with this standard.

4.3 CALCIUM SILICATE BRICKS
4.3.1 General Requirements
1 Calcium silicate bricks are to conform to the requirements of EN 771-2.
2 The brick is to be constructed of sand consisting mainly of quartz or uncrushed siliceous gravel or crushed siliceous gravel or crushed rock or a combination of such materials.
3 Suitable pigments may be mixed into the constituents to produced bricks of the required colour.

4.4 CONCRETE MASONRY UNITS
4.4.1 Concrete Blocks
1 Blocks are to be made with Portland cement unless used below ground level in which case sulphate resisting Portland cement shall be used.
2 All blocks are to be manufactured, supplied and tested in accordance with BS EN 771-3, BS 6073-2, and approved by Qatar Standards.
3 Recycled Aggregates may be used to replace up to 50% of natural coarse aggregates when the average compressive strength is equal to or greater than 7.0 MPa (N/mm2).
4 Recycled Aggregates may be used to replace up to 100% of natural aggregates (fine and coarse) when the average compressive strength is less than 7.0 MPa (N/mm2).
5 Aggregate shall meet the following requirements:
(a)
The manufacturer shall declare the materials to be used, the percentage of each material, their grading and shall be responsible for their suitability.

(b)
The acid soluble sulphate, as measured by BS EN 1744-1, shall not exceed 0.8% by weight of aggregate.

The use of blocks shall comply with Table 4.5. The minimum compressive strength of the average of 3 blocks shall be as given in Table 4.5. The associated mortar requirements for use with different applications for blocks is also provided in Table 4.5. Details of mixes for the class of mortar specified is provided in Part 2 of this Section.
Table 4.5
Compressive Strength

Classification Minimum Compressive Strength (N/mm2) Uses for which Blocks are Suitable Class of Mortar
Classes Average of 3 Blocks Lowest Individual Block
1 7.0 5.6 External non-load bearing walls M6
2 10.4 8.3 Load bearing walls M6
3 17.4 14 Load bearing walls below ground M12
4 14.0 11.2 Soakaways and manholes M12
5 4.0 3.6 Internal non-load bearing walls M6
5 4.0 3.6 Roof Block M4
5 4.0 3.6 Protective skins to foundations M6

7 Manufacturer should label or clearly define the classification or the uses of the blocks in factory.
8 Consultant or contractor should also mention the classification or the uses of the blocks in request sheet when the samples submit for testing in laboratory.
9 The volume of the cavities in the block shall not exceed 50 % of the gross volume of the block. The overall dimensions and wall and web thicknesses shall comply with Table 4.6.
Table 4.6
Block Dimensions and Wall and Web Thicknesses

Coordinating (nominal) size Minimum Thickness (mm)
(mm) Work size (mm) Wall Web
400 x 200 x 100 390 x 190 x 100 19 19
400 x 200 x 150 390 x 190 x 150 25 25
400 x 200 x 200 390 x 190 x 200 32 30

Notes:
(a) (b) Co-ordinating size is the size of the space allocated to the block including the joints and tolerances. Work size is the actual size for manufacture within the tolerances specified.

Subject to the tolerances specified in Table 4.7 and to any requirement for blocks with special faces, all surfaces should be flat and rectangular and adjacent surfaces are to be at right angles to one another with clearly defined undamaged arises.
Table 4.7
Block Tolerances

Dimensions Work Size of Block
Length Height Thickness + 3 mm to -5 mm + 3 mm to -5 mm . 2 mm for any measurement . 1.5 mm for the average of 7 measurements in any one block.

11 Unless otherwise specified, all block faces are to provide a satisfactory bond for mortar, plastering or rendering.
12 Each block manufactured from sulphate resisting cement is to be colour coded with an identifying mark.
13 All connections between masonry walls or partitions and concrete columns or walls shall be made using propriety stainless steel ties secured to stainless steel fixing channels embedded in the concrete.
14 Full Water Absorption:
The average water absorption of the tested sample shall not exceed 7% and no individual block shall have a water absorption greater than 7.5% (in accordance with CML Method 997).
15 Water absorption by capillarity method:
The manufacturer shall declare in g/m²s the maximum water absorption coefficient due to capillarity action of the exposed face of the unit.(according to EN 771-3:2003 )

4.4.2 Manufacture of Concrete Blocks
1 Blocks are to be manufactured in a vibrated/pressure block making machine using cement and aggregate in the proportions required to produce the minimum strengths given in Table
4.5.
2 The design of the cavities and webs in hollow blocks is to be submitted to the Engineer for approval before production commences.
3 The materials to be mixed in a mechanical mixer and placed in the block-making machine in layers not exceeding 100 mm, each layer being thoroughly vibrated and compacted before the addition of the next.
4 Immediately after manufacture the blocks are to be stacked on clean, level, non-absorbent pallets in honeycomb fashion. The pallets are to be marked with the date of production (in English and Arabic) and stored in a level curing and stacking area in such a manner that one
day’s production is separated from the next.

Part 04: Unit Masonry
5 Blocks manufactured from mobile machines are to be cast on to a clean concrete
hardstanding. Each day’s production shall be easily identifiable and kept separate from the
next.
6 All blocks, however manufactured, are to be immediately protected from the effects of the sun and wind by suitable moisture retaining coverings.

4.4.3 Block Dimensions
1 Block dimensions are to be measured in accordance with BS EN 772-2.
2 Blocks not exceeding 75 mm thick and blocks for use in the ground are to be solid unless otherwise directed. All other blockwork is to be hollow.

4.4.4 Precast Concrete Bricks
1 Precast concrete bricks are to conform to the requirements of BS 6073-2.
2 Precast concrete bricks are to be manufactured by compacting concrete under high pressure into a mould.
3 The pressure employed is to be such that a high initial strength is achieved, enabling the brick to be removed immediately, by extrusion, from the mould.
4 The cement used should be rapid hardening Portland cement and conform to the requirements Part 3 of Section 5.
5 The aggregate used to be sand or manufactured sand.

4.5 GLASS UNITS
4.5.1 General Requirements
1 Glazing units shall incorporate expansion-contraction thermal foam tape, sealants, flashings, and other items necessary for complete installation.

4.5.2 Submittals
1 The Contractor shall submit assembly instructions and installation drawings as required to indicate methods on construction, location and spacing of anchorage, joinery, finishes, sizes, shape, thickness of all materials and relationship to the adjoining work.

4.5.3 Material Storage and Handling
1 Material shall be stored in a dry place, off the ground, where temperature will not exceed 32 ºC handle material to prevent damage to finished surfaces. Do not install scratched or damaged components.
2 After installation, finished surfaces shall be protected from damage caused by ensuing work.

4.5.4 Laying
1 The Contractor shall verify all applicable field dimensions and adjust as necessary to accommodate the glazed wall.
2 The glass block grid system for the wall shall be assembled and sealed in accordance with instructions furnished by the manufacturer.
3 The assembled glass block grid system frame shall be placed into a properly prepared and sized rough opening and adjust until plumb and level. The grid system shall be screwed or nailed into place utilising all predrilled holes in the nailing flange.
4 A foam tape gasket shall be adhered to each of the glass blocks according to instructions furnished by manufacturer of the glass block grid system. The glass blocks shall be carefully inserted into the grid system from the exterior side of the wall so that each block is pressed against the T-Bar and the foam tape does not roll back.
5 Sealant to completely fill the channel shall be applied around each glass block and wipe flush with the surface. The sealant shall be applied to the exterior frame corners according to instruction furnished by the grid system manufacturer.
6 All exposed surfaces of the glass block grid system shall be cleaned with a clean, soft cloth and mild hand soap using gentle rubbing action. Abrasive or solvent-type cleaner, detergents or paint removers shall not be used.
7 All labels shall be removed from the glass blocks and cleaned with a soft cloth and water.

4.6 GYPSUM UNITS
4.6.1 General Requirements
1 Blocks for claustra walls are to be manufactured and built generally in accordance with the preceding clauses for blockwork, except where otherwise noted below.
2 Blocks may be constructed of either
(a)
white gypsum plaster

(b)
concrete

(c)
white concrete using white Portland cement and white aggregates, as described in the relevant provisions of Section 5, Concrete, or as described in the Project Documentation.

3 All blocks are to be finished with a fine finish to an approved ornamental pattern and are to be 100 m thick unless otherwise noted with slots in ends of blocks to receive reinforcement.
4 Claustra walls should be built with vertical straight joints reinforced with 12 mm mild steel reinforcing bars vertically at each straight joint pinned to structure at each end and surrounded solid with mortar.
5 Blocks are to be bedded in a mixture of white cement and sand (1:4) and struck pointed to approval.

4.7 STONE WORK
4.7.1 General Requirements
1 Stone work includes rough cut stone, marble, limestone, granite.
2 Stone work shall be executed by an approved specialist sub-Contractor
3 Stone should be sound and free from defects which would impair strength, durability or appearance. Each species of stone is to be provided from a single quarry. Quarries and fabrication plants should be available for inspection by the Engineer.
4 All stone to be of soundness (hardness and density), texture, graining colour, tone and range
matching the Engineer’s sample.
5 Dielectric separator: Bituminous paint is to be used in accordance with the manufacturer’s instructions and shall be approved by the Engineer.
6 Cushions: Clear plastic or neoprene, 25 by 50 mm, thickness as required.

4.7.2 Anchorage Devices
1 Anchors, dowels, cramps, plug anchors, angles, relieving anchors: Fabricated of stainless steel or non ferrous metal (e.g. bronze) complying with thickness as required to system imposed loads but not less than 5 mm.

2 Embedded items shall be of malleable iron castings or steel fabrications, thickness as required to sustain imposed loads but not less than 5 mm thick products to be stainless steel or non-ferrous. Devices embedded in concrete or masonry include the following:
(a)
edge inserts with tee-shaped wedge-action slot, with askew head bolt, washer and nut

(b)
dovetail anchor slots of size to receive specified anchor, filled with waterproof filler and open face sealed

3 Reinforcing mesh used for anchorage shall be stainless steel.

4.7.3 Mortar
1 Mortar shall comply with the relevant provisions of Part 2 of this Section. The cement used for stone work mortar shall be white Portland cement. The Class of mortar
2 Mortar for setting stone flooring, steps and treads shall be Class M7 mortar. The grout shall incorporate a waterproofing additive for wet area flooring.
3 Mortar for setting all other stone shall be Class M3 mortar. The mortar shall incorporate a waterproofing additive for wet areas and exterior stone. The mortar shall incorporate a shrinkage-reducing accelerator diluted with water in the ratio as recommended by the manufacturer.
4 Pointing mortar: shall be Class M5 mortar with a mineral colouring admixture as required to match the stone. The mortar shall incorporate a waterproof additive for exterior and wet area pointing.

4.7.4 Fabrication
1 The Contractor shall accurately cut, dress, drill, fit and finish stonework to shapes and dimension shown on the approved Shop Drawings. Exposed plane surfaces shall be made true in line and exposed curved surfaces true in radius. The thickness of the stone shown is the minimum thickness.
2 For wall facings, the Contractor shall do the following:
(a)
cut exposed external corners of stone as shown

(b)
ease exposed external edges where shown

(d)
make arises straight, sharp, true and continuous at joints

(e)
cut curved stone panels true to radius as shown to produce an even, flush curved surface.

4.7.5 Installation
1 Dovetail anchor slots, wedge type inserts, and other items requiring building in to concrete or masonry work shall be furnished in sufficient time so as not to delay the progress of the work. Tie inserts shall be wired into reinforcing to prevent displacement. No forced entry anchorage device will be allowed.

2 Stone shall be set in accordance with the approved Shop Drawings, level, plumb, square and true with uniform joints, accurately aligned with grain running in the direction as approved by the Engineer unless otherwise stated elsewhere in the Project Documentation. The work shall match mock-ups.
3 Dowels, anchors and ties in shall be provided in sufficient quantity to eliminate “rattle” or loose pieces and to ensure a rigid installation. The extent of the anchorage and installation details shown are intended to indicate minimum requirements. In general, a minimum of one anchor per 0.18 m2 is required, with additional anchorage provided where necessitated by the size, thickness and setting or shape.
4 Steel backup support shall be provided for the stone work where shown on the Project Drawings and as required to provide rigid installation. Steel support framing shall be anchored securely to the building structure.

4.7.6 Wall Cladding
1 Relieving angles shall be set as required for the proper support of stone. Before setting, the Contractor shall clean the stones and the backing. The stone shall be saturated with water before setting in mortar in order to prevent total absorption of moisture from the mortar.
2 Stone shall be set with two cushions per stone in every horizontal joint, extending full depth of the stone and to within the dimension from the face as shown. Secure with anchors, dowels, and cramps of approved construction, as required for a rigid and secure installation. Fill anchorage holes with accelerated setting mortar. Rigidly secure strap anchors to the backing.
3 Flashing materials shall be repaired to their original condition where they have been punctured by anchorage or damaged during setting.
4 Cavities shall be kept behind the facing free of mortar or other foreign material.
5 Fill and seal joints as indicated in the Project Documentation.

4.7.7 Paving and Flooring
1 The following shall be performed by the Contractor when laying paving and flooring:
(a)
place reinforcing mesh in the setting bed

(b)
tamp the stone into the setting bed with mallet until firmly bedded to the proper level

(c)
remove stone, cover the back of the stone with wet cement and return to position on the setting bed; before applying the wet cement, wet the back of the stone to prevent major absorption of moisture from the cement

(d)
use cushions and spacers to maintain uniform jointing and setting.

2 Joints shall be grouted with water and neat cement by buttering the edges of the stones as they are laid. Surplus joint cement cleaned from face of the stone immediately.

3 Where grinding is required to completely align and level joints, permit a minimum of six days of setting time to elapse before commencing grinding. Perform grinding by wet abrasion, in a manner as to retain the finish, to match the balance of stone paving, and so as to be free of depressions and grind marks. The Contractor shall exercise care to avoid damage to or soiling of adjacent work.

4.7.8 Erection Tolerances
1 The following maximum non-cumulative erection tolerances shall be complied with:
(a)
variation from plumb +/-3 mm in storey height

(b)
variation from level +/-3 mm in any bay

(d)
edge alignment 1.5 mm

4.7.9 Submittals
1 Submittals shall be made in accordance with the relevant provisions of Section 1, General and the following Clauses.
2 Shop Drawings: The Contractor shall submit shop drawings of the stonework showing in detail the layout, jointing, anchors and dowels, dimensions, sizes and locations of cut-outs, adjoining work, etc. Each piece on the Shop Drawings is to correspond to the identification number on the back of each stone. The Contractor shall co-ordinate all components which are specified elsewhere (flashing, insulation) which comprise the system into this submittal. Shop Drawings shall be co-ordinated with all related trades.
3 Samples: The Contractor shall submit to the Engineer 600 x 600 mm sample panels with cross-joints to show the sealant materials of each type and finish of stone required. The samples shall show the full range of colour and texture expected in the finished work. In addition the Contractor shall submit one (1) full size sample of each type and finish, falling in the average colour and texture range. The Engineer’s review and approval of the sample is to be for colour, texture and pattern only. Compliance with all other requirements is the exclusive responsibility of the Contractor.

4.7.10 Visual Mock-ups
1 Following the approval of the samples, the Contractor shall construct mock-ups for approval by the Engineer prior to installation. Mock-ups to be provided shall be as follows:
(a)
wall facing: assembled to simulate the final condition, direction of graining, and indicating joint conditions, use of spacers, shims, anchorage, relieving angles, supports, and all other features of the final work

(b)
flooring: samples of flooring/skirting, etc, of each type of stone work specified is to consist of a full pattern and be complete with all anchors, bedding, jointing, sealers, etc., in accordance with approved shop drawings

4.8 CAST STONE
4.8.1 General Requirements
1 The requirements for manufactured stone for vertical applications and for trim, including copings and sills shall comply with the relevant provisions of BS 1217 or ASTM C1364 and reconstructed masonry shall comply with the relevant provisions of BS EN 771-5.
2 Cast stone work is to be executed by an approved specialist subcontractor.
3 All cast stone is to be sound and free from defects which would impair strength, durability or appearance. Each type of stone is to be supplied from the same quarry. Quarries and fabrication plants are to be available for inspection by the Engineer.
4 Joint sealing compounds used with stone will conform to Section 24, Part 15.

4.8.2 Submittals
1 Samples: The Contractor shall supply cast stone sample panels, size 200 x 200 x 300 mm, for each colour and finish of stone for approval by the Engineer.
2 Shop Drawings: The Contractor shall provide drawings of cast stone work showing anchorages for the approval of the Engineer.
3 Certificates: The Contractor shall provide certification documentation as necessary, describing in detail testing laboratory facilities and qualifications of its principals and key personnel. The Contractor shall also provide certification that the cast stone meets requirements of the Project Documentation.

4.8.3 Product Delivery, Storage and Handling
1 Cast stone shall be cured for a minimum of 30 days before delivery. Each unit is to have the date of manufacture impressed in the back of the stone.
2 Cast stone shall be stored under waterproof covers on boarding clear of the ground and shall be protected from handling damage, dirt, stain, water and wind.

4.8.4 Anchorage Devices
1 Coping stones shall be anchored to the masonry with no less than two dowels to each stone. Dowels may be either 8 mm stainless steel pipe 75 mm long or 12 mm diameter stainless steel bars 75 mm long.
2 Course stones shall be anchored to the backing with one metal anchor for each 600 mm in length. Each stone shall have not less than two anchors. Anchors are to be stainless steel 4 mm x 30 mm with the end in the stone turned down 25 mm and other end turned up to 50 mm
END OF PART