General requirements

0344 Methods of Measurement

Precast units shall be understood as including moulds, concrete, reinforcement, placing in position and finishing face of units.

Precast units shall be measured by length or enumerated stating sizes.

035 CONCRETE ANCILLARIES

0351 DEFINITION

Concrete ancillaries shall include expansion joints in fiber board, plastic material & plastic, metal and other water stops, permanently or temporarily embedded in concrete.

0352 EXPANSION JOINTS

Where shown, expansion joints shall be formed between the concrete faces, or between concrete and other adjacent work, by means of incorporating in the formwork an approved impregnated fiberboard or other filler to the thickness shown on the drawings.

The Exposed edges of expansion joints shall be sealed. Filler boards shall be adequately wound into adjoining concrete to prevent their falling out when the joint opens.
In-situ ground slabs laid on backing material shall be cast in bays not exceeding 40m2 in area. The layout of construction joints in the slab shall be approved in advance. Fabric reinforcement shall be so arranged that laps shall occur along the joints as detailed on drawings.
Steps necessary, such as sealing of joints shall be taken to prevent escape of grout which would lead to staining of brick, stone, block works and exposed concrete surfaces when the in-situ topping is laid.
0353 WATER STOPS

The material, sizes and location of water stops in concrete joints shall be as detailed in drawings.

Water stops shall be as long as practicable to ensure that end joints are reduced to the minimum.
Water stops shall be overlapped, welded or fixed otherwise at end joints, in order to attain the water tightness and flexibility required by the continuous section of the water stop material.
0354 OTHER EMBEDDED MATERIALS

Embedded materials to form ties for other adjacent work, block outs for service pipes, conduits and anchors shall be placed prior to concreting.

Embedded materials shall be accurately placed and set secure in position in order to ensure that no cutting of concrete is required after casting and the embedded items are protected against displacement.
Precaution shall be taken in removing embedded materials after concreting if such items are required to form block outs.
Grouting to temporary opening after placement of anchors, pipes, etc., shall be done in the same class of concrete as used for the concrete work under consideration.

0355 METHODS OF MEASUREMENT

Expansion, materials, water stops, block outs, etc shall be measured in length or enumerated stating sizes and understood as including removal if material is placed as temporary measure only.