By John Newman, B S Choo
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Extra resources for Advanced Concrete Technology 1: Constituent Materials (Advanced Concrete Technology Set)
In addition, some UK cement standards include cements with strength classes and properties outside the scope of BS EN 197-1 for common cements. For example, BS 146:2002, includes a low early strength class (L) for blastfurnace slag cements and there is a low 28-day class (22,5) in BS 6610:1996 for Cements pozzolanic fly ash cement. Both of these standards will be withdrawn when European Standards covering the same scope are eventually published. 12. 0% in clinker Upper limits for loss on ignition (LOI) and insoluble residue (IR) have featured in cement standards since their first introduction.
They also describe the test procedures to be used to determine cement composition and cement properties. Although it is now rather out of date, particularly in relation to the standards in place in European countries, the publication by Cembureau, (1991) provides a useful review of cement types produced around the world. In the past, national cement standards in many countries have been strongly influenced by those developed in the UK and published by the British Standards Institution (BSI) and by those developed in the USA and published by the American Society for Testing and Materials (ASTM).
These solid hydrates occupy more space than the anhydrous particles and the result is a rigid interlocking mass whose porosity is a function of the ratio of water to cement (w/c) in the original mix. Provided the mix has sufficient plasticity to be fully compacted, the lower the w/c, the higher will be the compressive strength of the hydrated cement paste/mortar/concrete and the higher the resistance to penetration by potentially deleterious substances from the environment. Cement hydration is complex and it is appropriate to consider the reactions of the silicate phases (C3S and C2S) and the aluminate phases (C3A and C4AF) separately.
Advanced Concrete Technology 1: Constituent Materials (Advanced Concrete Technology Set) by John Newman, B S Choo