Concrete with strength grade of C70 for section steel concrete composite structure
A combination structure and strength grade technology, applied in the field of concrete, can solve the problems of loss of use function and even bearing capacity, heavy strength but light durability, casualties and building facilities, etc., to achieve high economy, improved bonding performance, and good society benefit effect
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[0030] (1) Raw materials:
[0031] 1. Cement
[0032] Choose P.O 52.5R cement with stable quality and performance, and conduct a fluidity test with superplasticizer before use, so as to select cement varieties with good compatibility with superplasticizer. Selected cement performance indicators (including fineness, SO 3 content, MgO content, initial setting time, final setting time, 3-day strength, 28-day strength) must meet the requirements of relevant national standards.
[0033] 2. Aggregate
[0034] The fine aggregate is medium-coarse river sand with smooth particles, hard texture, and good collection and distribution. The quality of the sand should meet the high-quality sand standard specified in GB / T14684-93 Construction Sand Standard. Its fineness modulus is between 2.5 and 3.4 (the higher the grade of the prepared concrete, the upper limit of the sand fineness modulus should be adopted as much as possible), and the mud content is controlled below 1.0%.
[0035] Coa...
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