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Method for quickly determining water-cement ratio of industrial-cinder-doped concrete

A rapid determination of water-binder ratio technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of increasing the difficulty of concrete, and achieve the effect of short operation time, high precision and small test error

Inactive Publication Date: 2013-06-19
SINOHYDRO BUREAU 14 CO LTD
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AI Technical Summary

Problems solved by technology

The addition of ash and slag significantly increases the difficulty of quickly testing the quality of concrete, especially the difficulty of quickly testing the water-binder ratio of fresh concrete

Method used

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Examples

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Embodiment Construction

[0024] According to the method of directly testing the water-binder ratio, combined with the "Hydraulic Concrete Test Regulations" (DL / T5150-2001) for testing. Use a 5mm sieve to sieve out the cement mortar from the concrete mixture, weigh the mass of the mortar in the air and water, respectively, clean the mortar in a 0.16mm sieve, and weigh its mass in water, using the above equations Calculate the water-binder ratio directly.

[0025] Specific steps are as follows:

[0026] 1) Test the mass M of the freshly mixed industrial slag (fly ash) concrete mortar after screening in the air 1 and the mass M in water 2 , wash the mortar in a 0.16mm sieve, weigh the mass S of the sand in water 2 , meanwhile, and the pre-tested cement density ρ c , sand apparent density ρ s The following three equations can be established:

[0027] W+C+S=M 1 (1)

[0028] C / ρ c ×(ρ c -1) +S / ρ s ×(ρ s -1)=M 2 (2)

[0029] S 2 / (ρ s -1) × ρ s =S (3) ...

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Abstract

The invention relates to a method for quickly determining water-cement ratio of industrial-cinder-doped (fly-ash-doped) concrete, which comprises the following steps: testing mass M1 of screened freshly-mixed concrete mortar in air and mass M2 in water, cleaning the mortar in a 0.16mm screen, weighing mass S2 of sand in water, previously testing cement weight rho[c] and sand apparent density rho[s], and establishing the following 3 equations: W+C+S=M1, C / rho[c]*(rho[c]-1)+S / rho[s]*(rho[s]-1)=M2, and S2 / (rho[s]-1)*rho[s]=S; directly calculating sand mass in the mortar according to the equations, thereby calculating other variables and the water-cement ratio; and carrying out error correction to obtain the concrete water-cement ratio W' / C', substituting rho[c] with rho[B] (rho[B]=rho[c]*C / B+rho[a]*A / B) to obtain the mass B of cement in the mortar, and finally obtaining the water-cement ratio of the industrial-cinder-doped concrete W' / B'. The invention can quickly, directly and precisely test the water-cement ratio of the field concrete, and has the advantages of small errors and high precision.

Description

technical field [0001] The invention belongs to the technical field of concrete engineering, in particular to a method for quickly measuring the water-binder ratio of concrete doped with industrial slag (fly ash). Background technique [0002] The quality of concrete engineering is a matter of great concern to the production and construction of concrete components. At present, the quality of concrete with concrete strength as the main acceptance index, the standards and specifications of almost all countries in the world can only be known 28 days after concrete pouring. Due to the long period of this test method, it is impossible to control and judge the quality of concrete in time. Over the years, the early testing of concrete quality has developed rapidly in developed countries, and has also been highly valued by many experts and scholars in China. In recent years, in order to improve the overall performance of concrete, a large amount of industrial ash, such as fly ash ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 史明兴鹿永久唐自琴魏小龙
Owner SINOHYDRO BUREAU 14 CO LTD
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