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https://www.concrete.org/committees/getagendaminutes.aspx?DocID=58128
o If the specification has a maximum w/c of 0.45, you should see 28 day strengths averaging 4500 psi. Half of the tests will be below 4500 and half will be above 4500 psi, indicating that the producer and contractor supplied and placed concrete with a w/c around 0.45. Through test data I have seen, 4500 psi can be achieved with 3500 pound
https://www.engr.psu.edu/ce/courses/ce584/concrete/library/materials/Admixture/AdmixturesMain.htm
The WRA that retards the initial setting time more than three hours later is classified as WRA with retarding effect (Type D). Commonly used WRA is lignosulfonates and hydrocarboxylic (HC) acids. The use of HC acids as WRA requires higher water content compared to the lignosulfonates. Rapid bleeding is a problem for concrete treated with HC acids.
https://aussie-hours.com/canterbury-new-south-wales/bwc-concrete-construction-pty-ltd-519936
Find opening & closing hours for B.w.c. Concrete Construction Pty Ltd in 20 Charles Street, Canterbury, New South Wales, 2193 and check other details as well, such as: map, phone number, website.
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