![]() When batching, it is of critical importance to account for this water. Most commonly, aggregates will have a moisture content that is either below or above this absorption limit. The absorption of the aggregate indicates the quantity of water which will be absorbed into the pore structure. In practice, aggregates in stockpiles, plants, and in the mixture are rarely, if ever, at these moisture conditions. Both of these are laboratory definitions. The second, saturated surface dry condition, is defined as the condition in which all of the pore space within the aggregate is full of water, but no water is present on the surface. The aggregates, which contain pore spaces of their own, have those pore space filled only with air. The first, oven dry, means exactly what it sounds like. In the laboratory, and when designing concrete mixtures, we really talk of only two moisture conditions. But what isn’t understood as well is that the water-cement ratio controls the pore volume and pore sizes in the concrete, thereby determining not only the strength but also durability. We are all familiar with Abrams Law, which states that, all other things being equal, compressive strength of concrete is dependent on the ratio of mass of water to cementitious material. The moisture condition of aggregates in concrete is very important.
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