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Method for detecting content of fly ash in newly stirred concrete

A detection method and concrete technology, applied in the detection field, can solve problems such as no effective detection method, and achieve the effect of promoting resource utilization, simple detection method and less detection equipment

Inactive Publication Date: 2005-03-16
重庆市建筑科学研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to determine whether the content of fly ash in concrete meets the standard requirements and ensure the quality of concrete, there is no effective detection method at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment is carried out with two groups of freshly mixed mortar parallel samples, and the mixing ratio of freshly mixed mortar samples is

[0038] Cement: fly ash: sand = 45:15:40 (weight ratio)

[0039] Cement: fly ash = 45 / 2.92: 15 / 2.20 = 15.41: 6.82 = 69.32%: 30.68% (volume ratio)

[0040] The measured cement density in the raw material is 2.92, the fly ash density is 2.20,

[0041] Adhesive mixture theoretical density: Y h =69.32%×2.92+30.68%×2.2=2.70;

[0042] The theoretical mass ratio of fly ash in the glue mixture: 15 / (45+15)×100%=25%

[0043] The theoretical mass ratio of fly ash in fresh mortar: 15 / 100 = 15%

[0044] The specific implementation process is:

[0045] ①Mix the raw materials evenly, then add 30ml of water (water-to-binder ratio is 0.5), stir repeatedly 60 times, let stand for hydration for 5 minutes after mixing, then add 100ml of acetone to stop hydration, and dry at 105°C for 10 hours to constant weight;

[0046] ② Grind the sample f...

Embodiment 2

[0066] This embodiment is carried out with two groups of freshly mixed concrete parallel samples, and the mixing ratio of freshly mixed concrete samples is

[0067] Cement: fly ash: sand: gravel = 45:13.5:100:180:28.5 (weight ratio)

[0068] Cement: fly ash = 45 / 2.92: 13.5 / 2.20 = 15.41: 6.14 = 71.51%: 28.49% (volume ratio)

[0069] The measured cement density in the raw material is 2.92, the fly ash density is 2.20,

[0070] Adhesive mixture theoretical density: Y h =Y c ×71.51%+Y f × 28.49% = 2.715;

[0071] The theoretical mass ratio of fly ash in the glue material mixture: 13.5 / (45+13.5)=23.08%

[0072] Theoretical mass ratio of fly ash in fresh concrete: 13.5 / (45+13.5+100+180)=3.99%

[0073] The specific implementation process is:

[0074] ①Dry cement, sand, stone, and fly ash at 105°C for later use. After drying, pass the crushed stone through a 4.75mm sieve, and pass the sand through a 75μm sieve;

[0075] ②Accurately weigh (measure) 45g of cement, 13.5g of fly ...

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Abstract

It is a measurement for content of fly ash in the new-mixed concrete and especially relates to the measurement for concrete content. The method in this invention is the following: first to separate through partition method carpolite, sand and mixture of cement and fly ash in the specimen of new-mixed concrete and to weigh them after cooling and drying; then to measure the cement, fly ash density in the material used in the concrete or sand plasm and density of the recycled mucus mixture; then to measure the fly ash content through simple calculation. This invention improves the measurement for the concrete content and can be widely used in the measurement of the solid waste such as fly ash in the new-mixed concrete.

Description

1. Technical field [0001] The invention relates to detection technology, in particular to a detection method of concrete components. 2. Background technology [0002] Fly ash is industrial waste discharged from coal-fired power plants, which not only pollutes the environment, but also takes up a lot of land for stacking. However, due to its potential reactivity, fly ash is a good admixture for concrete. After mixing fly ash in concrete, it can not only reduce the water demand of concrete, improve the pumping performance, but also improve the compactness, fluidity and plasticity of concrete, and reduce bleeding segregation and slump loss. Therefore, using fly ash as a concrete admixture is one of the important ways to turn waste into treasure and make full use of waste resources. The relevant departments of my country's construction industry have also given active support and encouragement. [0003] For a long time, the only way to detect the content of concrete components ...

Claims

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Application Information

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IPC IPC(8): G01N5/00G01N9/36
Inventor 杨再富钱觉时宋开伟
Owner 重庆市建筑科学研究院有限公司
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