ASTM Pros

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Ontario, the cements at these different locations may perform differently when they chemically react with an admixture due to the nature of the semetitious material at that plant. When testing an admixture across many different cements it becomes more evident that admixtures do not react the same with cements from different location even if they are of the same type. By this it is meant that some cements may result in higher compressive strengths, while other cements may yield very little change or may turn results with side effects such as entrained air.
The dilemma then lies in the reality that the cements were not manufactured to be "admixture friendly". The LAOP was designed to find the superior and most consistent admixture to work on a variety of cements and to be indiscriminate of location. The tests were conducted on four Type-10 cements from four different Lafarge manufacturing locations and it is expected that Type-10 cements from other Lafarge locations will ...

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can come in very handy in such a situation to slow down the hardening rate of the concrete.
Of course most often a better concrete means a stronger concrete and in this report that is exactly what it means. The admixtures will be tested to see which of them can yield the highest strength and do it consistently across cements from Lafarge locations all over Ontario.
The theory holds that to achieve a higher strength in concrete water must be reduced, however if the water content for a given mix design is reduced to much, the concrete becomes to dry and the cement will not hydrate properly causing poor bonds between the mortar and the aggregate. This in turn may result in even a ...

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