SOUTH AFRICAN NATIONAL STANDARD

Transcription

1 ISBN SOUTH AFRICAN NATIONAL STANDARD Concrete floors Part 1: Bases to concrete floors Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: Fax: SABS

2 Table of changes Change No. Date Scope Amdt Amended to update referenced standards. Acknowledgement The SABS Standards Division wishes to acknowledge the valuable assistance rendered by the Cement and Concrete Institute in providing material for this document. Foreword This South African standard was approved by National Committee SABS SC 59A, Construction standards Cement, lime and concrete, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in June This document supersedes SANS :2009 (edition 3). SANS consists of the following parts, under the general title Concrete floors: Part 1: Bases to concrete floors. Part 2: Finishes to concrete floors. A vertical line in the margin shows where the text has been technically modified by amendment No. 1 Annex A forms an integral part of this document.

3 Contents Page Acknowledgement Foreword 1 Scope Normative references Definitions Subgrades and subbases General Subgrades General requirements Soil strength and density Subgrade uniformity Subgrade strength Subbases General Thickness of subbases Materials for subbases Underfloor dampproof course Concrete for floor slabs General Materials General requirements Cements Aggregates Admixtures Fibres Evaporation retardants Curing compounds Concrete mix proportioning General Proportioning Fresh concrete Hardened concrete Strength of the concrete Design of the thickness of floor slabs General Thickness-design objectives and determinants The strength of the subgrade/subbase Loads on floor slabs General Dynamic (vehicle-wheel) loads

4 Contents (concluded) Post loads Distributed loads Unusual loads Floor-slab thickness design Joints Functions of joints Control of cracking Load transfer General Aggregate interlock Keyways Dowels and tie bars Types of joint General Contraction joints Construction joints Isolation joints Sealing of joints General Sealants Types of floor slab General Jointed unreinforced floor slab Continuously reinforced floor slab Jointless prestressed floor slab Fibre reinforced floors Methods of construction of floor slabs General Methods of laying of floor slabs Applicability of types of joint Figures 1 to Tables 1 to Annex A (normative) Reinforcement in floor slabs on the ground Bibliography Page 2

5 Concrete floors Part 1: Bases to concrete floors 1 Scope This part of SANS covers the design, detailing, materials and construction of types of concrete floors that are cast on the ground and are subjected to industrial and commercial loads. This part of SANS does not cover domestic floors or floors that are subjected to vibrating loads. NOTE 1 Bases to suspended concrete floors are covered by SANS NOTE 2 Finishes to concrete floors are covered by SANS Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Information on currently valid national and international standards can be obtained from the SABS Standards Division. AASHTO M 145, The classification of soils and soil-aggregate mixtures for highway construction purposes. ASTM C 260, Standard specification for air-entraining admixtures for concrete. ASTM C 309, Standard specification for liquid membrane-forming compounds for curing concrete. ASTM C 494, Standard specification for chemical admixtures for concrete. ASTM D 2240, Standard test method for rubber property Durometer hardness. ASTM D 2487, Standard practice for classification of soils for engineering purposes. SANS 110, Sealing compounds for the building industry, two-component, polysulphide base. SANS 920, Steel bars for concrete reinforcement. SANS 1024, Welded steel fabric for reinforcement of concrete. 3