I.S. 20:1974

1 SCOPE
2 DEFINITIONS
3 DIMENSIONS
4 CEMENT
5 AGGREGATE
6 ADDITIVES OR ADMIXTURES
7 FORM
8 CAVITIES
9 JOINTS
10 SURFACE
11 BLOCKS WITH SPECIAL FACES
12 DENSITY
13 STRENGTH
14 DRYING SHRINKAGE
15 WETTING EXPANSION
16 CERTIFICATE
17 INDEPENDENT TESTS AND SAMPLING
18 COST OF INDEPENDENT TESTING
19 MARKING
APPENDIX A METHOD FOR THE MEASUREMENT OF DIMENSIONS
APPENDIX B METHODS FOR THE DETERMINATION OF BLOCK DENSITY,
           AND WIDTH AND VOLUME OF CAVITY
APPENDIX C METHOD FOR THE DETERMINATION OF COMPRESSIVE STRENGTH
APPENDIX D METHOD FOR THE DETERMINATION OF TRANSVERSE BREAKING
           LOAD
APPENDIX E METHODS FOR THE DETERMINATION OF DRYING SHRINKAGE
           AND WETTING EXPANSION
APPENDIX F ROUTINE RAPID CONTROL TEST OF COMPRESSIVE STRENGTH
           BY MANUFACTURER

Applicable to solid, hollow or cellular blocks, including aerated blocks designated according to their properties and gives the uses for which they are intended. Also gives requirements for dimensions, materials, surface, density, strength, drying shrinkage and wetting expansion. It covers special blocks. Provisions are included for sampling, certification and marking.