Method for measuring unit water use and water-binder ratio of fresh concrete

Abstract

The invention discloses a method for measuring unit water use and water-binder ratio of fresh concrete. The data measured in the method can be calculated in three parts by the following formulas: (1) the design volume weight of the fresh concrete is equal to beta measurement / (1+delta VC-delta VS), wherein beta measurement is the actual volume weight of the fresh concrete; delta VC is the volume change of cement after the cement comes across water; delta VS is the total volume change of water and sand after the sand absorbs the water; (2) the unit water use is equal to ( (MC+MF+MS+MG)-beta*(VC+VF+VS+VG+A / 100)) / (beta / 1000-1), wherein MC is the cement content; MF is dosage of admixture; MS is sand consumption; MG is amount of pebbles; VC is the volume of the cement; VF is the volume of the admixture; VS is the volume of the sand; VG is the volume of the pebbles; A is gas content; (3) the water-binder ratio is equal to W water / (MC+MF)*100.

Description

[0001] Field [0002] The content of the invention belongs to a method for measuring the unit water consumption and water-binder ratio of concrete by the bulk density method. The invention belongs to the technical field of on-site detection of fresh concrete water consumption and water-binder ratio. Background technique [0003] On-site quality inspection of fresh concrete, there is no standard and method in my country's commercial concrete industry, but the quality of fresh concrete plays an important role in the quality of the project after construction, and the control of concrete in the construction process is strengthened Very important. [0004] For example, in the concrete mixing plant of mixed engineering, it is often seen that piles of stones, sand and other materials are placed in the open air, exposed to wind, sun and rain, and the internal and external moisture content of the material is very different. When the material moisture content cannot respond to the mix r...

AI Technical Summary

Problems solved by technology

The uncertainty of the material composition in the concrete mix ratio has a very serious negative impact on the quality of the project, especially for national key projects. If the structure collapses, it will seriously endanger the national interests and the loss of safety.

[0006] At present, in the process of concrete production, there is no practical way to detect whether the unit water consumption and water-binder ratio of concrete meet the design requirements or are consistent with the laboratory trial mix, and there is no way to know whether the hardened concrete meets the construction requirements. Therefore, Concrete quality during production has long been unmeasurable