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5.3 It is difficult to produce self-consolidating concrete that is both flowable and nonsegregating using coarse aggregates larger than 25 mm [1 in.].
Therefore, this test method is considered applicable to self-consolidating concrete having coarse aggregate up to 25 mm [1 in.] in size.
Combining values from the two systems may result in non-conformance with the standard.
1.3 The text of this standard references notes and footnotes that provide explanatory material.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard.
It can be also categorized as high performance concrete as the ingredients are the same, but in this type of concrete workability is increased.
Increased fines contents can be achieved by increasing the content of cementititious materials or by incorporating mineral fines.
Admixtures that affect the viscosity of the mixture are especially helpful when the grading of available aggregate sources cannot be optimized for cohesive mixtures or with large source variations.
Many factors need to be taken into account, from the cost of the various additives and aggregates, to the trade offs between the "slump" for easy mixing and placement and ultimate performance.
A mix is then designed using cement (Portland or other cementitious material), coarse and fine aggregates, water and chemical admixtures.
These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes.