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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Tools > Frequently Asked Questions
Q. Can trial mixtures be made with full-size batches at the start of a job? A. Yes, with the necessary improvements in succeeding batches. By starting with an over-mortared mixture, the adjustment to the desired workability can be made with less difficulty. The best practice is to make the full-size batches before the start of the job to enable appropriate adjustments in proportions if the specified concrete properties are not obtained. If small laboratory batches are made, still some adjustments in field batches may be necessary because of differences between laboratory and field conditions. References: SP-1(02); ACI PRC-211.1-22 Topics in Concrete: Mixture Proportioning; Testing of Concrete
Q. Can trial mixtures be made with full-size batches at the start of a job?
A. Yes, with the necessary improvements in succeeding batches. By starting with an over-mortared mixture, the adjustment to the desired workability can be made with less difficulty. The best practice is to make the full-size batches before the start of the job to enable appropriate adjustments in proportions if the specified concrete properties are not obtained. If small laboratory batches are made, still some adjustments in field batches may be necessary because of differences between laboratory and field conditions.
References: SP-1(02); ACI PRC-211.1-22
Topics in Concrete: Mixture Proportioning; Testing of Concrete
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