Quantitative evaluation method for analyzing concrete workability based on bottom resistance

Abstract

The invention relates to a quantitative evaluation method for analyzing concrete workability based on bottom resistance. The quantitative evaluation method comprises the following steps: (1) carryingout a fresh concrete bottom resistance test; (2) drawing a time-varying curve of the displacement and speed of the steel sheet; (3) quantitatively evaluating the workability of the concrete based on the bottom resistance condition; according to the method, a newly-mixed concrete bottom resistance test can be effectively carried out, the concrete bottom insertion speed is calculated, a curve that the displacement and the speed change along with time is drawn, and the sinking condition of the newly-mixed concrete aggregate is quantitatively characterized through a concrete workability comprehensive coefficient, so that quantitative evaluation on the concrete workability is achieved; the defect that a traditional method is difficult to quantitatively characterize the concrete segregation degree is overcome.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating the workability of concrete, in particular to a method for quantitatively evaluating the workability of concrete based on bottom resistance analysis. Background technique [0002] In civil engineering construction, in order to obtain a dense and uniform concrete structure and facilitate construction operations (mixing, transportation, pouring, vibration, etc.), fresh concrete must have good construction performance, which is called the workability of concrete. The connotation of workability of concrete mixture is relatively complex, including many aspects of fluidity, cohesion and water retention. However, fresh concrete with poor workability has phenomena such as delamination, segregation, and bleeding, which have a relatively large negative impact on the construction process and process quality. [0003] Therefore, in order to ensure the quality of the project and the smooth progress of...

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Problems solved by technology

However, the conditions for indirect evaluation of concrete properties using concrete rheological properties are relatively harsh. The expensive price and huge equipment volume of this method limit its application range to the laboratory, which lacks economy and convenience.

[0006] At the same time, the actual construction site basically uses visual inspection and construction experience to evaluate the cohesion and water retention of fresh concrete. The test results often fluctuate greatly with the differences of testers. This method lacks accuracy and cannot be quantified. standardization

[0007] Fresh concrete with poor workability is prone to bleeding and segregation. Generally, these two phenomena occur at the same time. Once the concrete bleeds, the water and mud float up, and the sinking stones are tightly bonded to the base. Knotted together, it will greatly increase the resistance to insertion into the concrete bottom

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