2 selecting proportions for normal-density and high-density concrete—guide (aci prc-211.1-22) increased resistance to alkali-aggregate reaction and sulfate attack (ACI 225R and ACI 233R), reduced heat of hydra-

trusion of aggressive solutions (See ACI 225R and ACI 226.1R). 2.2. The selection of concrete proportions involves a balance between economy and requirements for placeability, strength, durability, density, and appearance. The required characteristics are governed by the use to which the concrete will be put and by conditions expected to be ...

Most structural lightweight aggregate concrete mixture propor-tions are reported in the oven-dry condition. However, in the field they are not SSD, but in a damp or wet condition. This condition is usually achieved by sprinkling, soaking, ther-mal quenching, or vacuum saturation.

This guide to concrete proportioning provides background information on, and a procedure for, selecting and adjusting concrete mixture proportions. It applies to normal-density concrete, both with and without chemical admixtures, supplementary cementitious materials, or both.

This publication describes methods for selecting and adjusting proportions for normal weight concrete. The procedures take into consideration the requirements for placeability, consistency, strength, and durability. Example calculations are shown, including adjustments based on the characteristics of the first trial batch.

2023年6月14日 · special properties, or achieve economy (ACI 212.2R). It is beyond the scope of this discussion to review the theories of concrete proportioning that have provided the background and sound technical basis for the relatively simple methods of this Standard Practice. More detailed information can be obtained from the list of references in Chapter 8.

2022年8月17日 · ACI Committee 211–Proportioning Concrete Mixtures, has revised the entire guide to include the latest information on supplementary cementitious materials, chemical admixtures, particle packing, and more.