A method for measuring the volume of concrete paste after mixing

Abstract

The invention discloses a method for measuring the volume of mixed concrete slurry, which comprises the steps of 1) testing the volume V0 of mixed concrete; 2) sieving the mixed concrete by a first sieve, drying, and testing the mass m1 and density [rho]1 of the material left on the first sieve; 3) sieving the material passing through the first sieve by a second sieve, drying, and testing the massm2 and density [rho]2 of the material left on the second sieve; 4) firstly sieving stone samples by the first sieve, then sieving the stone samples by the second sieve, and testing the mass fractionx21 and density [rho]21 of stones passing through the first sieve and the mass fraction x22 of stones left on the second sieve; 5) sieving sand samples by the second sieve, and testing the mass fraction x3 of sand passing through the second sieve to the total amount of concrete sand and the density [rho]3 of the sand passing through the second sieve; and 6) calculating the volume of the slurry. The actual slurry volume of the fresh mixed concrete can be obtained according to the method, and the accuracy is high.

Description

technical field [0001] The invention belongs to the field of building materials and relates to concrete, in particular to a method for measuring the volume of concrete slurry after mixing. Background technique [0002] Concrete is an artificial stone made of cementitious materials, coarse and fine aggregates, water and other admixtures in appropriate proportions. Concrete aggregate refers to the granular loose material that acts as a skeleton or filling in concrete. Coarse aggregate and fine aggregate. Aggregate with a particle size greater than 4.75 mm is called coarse aggregate, commonly known as stone. Aggregate with a particle size below 4.75mm is called fine aggregate, commonly known as sand. The total volume of coarse and fine aggregates generally accounts for 70% to 80% of the concrete volume. [0003] Modern concrete mix ratio design is calculated according to the traditional mass method and volume method. Such methods are often used in standard laboratories, aft...

AI Technical Summary

Problems solved by technology

[0009] For the concrete of the same material, this method can be used for the preliminary design of the mix ratio, which is convenient for calculation and operation, and has good practicability. However, whether the assumed concrete slurry volume is accurate is the key to the test results. The concrete slurry volume is reduced by the admixture. The influence of the water rate and the adaptability of the admixture and the glue, and the water reduction rate of the admixture recommended by the manufacturer is only for the water reduction rate measured by the national standard GB 8076-2008 method, which cannot truthfully reflect the real situation of the admixture in the ratio