The scope of this procedure covers the control of installation of in-situ concrete paving surfaces including finishes to ensure compliance with the contract specifications.
.1All activities connected with concrete pavings will be carried out in accordance with the contract specifications. In any circumstances where specifications are not provided or unclear, clarification will be sought from the Consultant’s representative.
.2 Where necessary a method statement shall be prepared and approved by the Project Director/Manager. It shall include:
i) The agreed tolerance on level and surface regularity.
ii) Site protection and safety.
iii) Mix design details for wearing surfaces.
iv) Method of placing, compacting and finishing concrete.
v) Method of curing.
.3Source certificates of basic constituents of concrete to be obtained from the supplier to verify compliance with the specifications.
.4Ensure that the proposed sequence of work is commenced in compliance with the contract programme. While framing the construction schedule, additional allowance shall be made for the following:
i) Laying under floor services,
ii) Curing and drying of the base concrete before the flooring is laid.
iii) Curing of the flooring,
iv) Period of protection of the completed floor from damage by other trades, including restriction of access.
.5Special care while laying concrete finishes and wearing surfaces:
i) Where a structural concrete slab itself forms the flooring or where a topping is laid monolithically or bonded to a hardened base, the wearing surface shall be adequately protected against damage during subsequent building operations.
ii) In hot or drying conditions, care shall be taken that the concrete mixes do not stiffen or dry out to an extent that prevents full compaction. After compaction and finishing, the surface shall not be allowed to dry out quickly and this may be achieved by protection by plastic sheeting or other suitable means. In addition where concrete is laid in the open, its surface shall be protected from the effects of the sun and wind to limit the risk of cracking.
iii) Compaction of concrete shall be carried out in such a way that an excess of `laitance’ is not brought to the surface.
For the highest abrasion resistance, the final trowelling shall be made when considerable pressure is required to make any impression on the surface. However, excessive trowelling should be avoided to prevent the production of a polished or slippery finish. Water shall not be applied between trowelling operations as this may cause surface weakness.
iv) Curing shall be done as specified.
v) When topping is laid separately and bonded, the surface of the base shall be thoroughly prepared as specified to ensure proper bond between the topping and the base concrete.
|PROJECT: PROJECT NAME SITE NO.:|
CHECK SHEET FOR CONCRETE PAVINGS
SECTION OF WORK _________________________________ LOCATION _________________
1. Establish datums for finished level of finished surface.
2. Check mix design details.
3. Check materials (cement and aggregate) to specification.
4. Check surface preparation.
APPROVAL TO PROCEED.
5. Check compaction (no bleeding shall occur).
6. Check an excess of `Laitance’ is not brought
to the surface.
7. Check surface finishing
8. Check curing technique being followed.
9. Check finished levels are within tolerance.
10. Protect surface against damage.
11. Check adhesion between concrete topping and
base by tapping for hollowness.
APPROVAL TO PROCEED
QA/QC – Quality Assurance/Quality Control, PE – Project Engineer, SE – Site Engineer,
SU – Surveyor, GF – General Foreman
Download Concrete Pavings Method Statement in word format: CONCRETE PAVINGS METHOD STATEMENT