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A method for measuring the reaction degree of each substance in a three-phase composite system of fly ash, silica fume and cement

A technology of reaction degree and fly ash, which is applied to the reaction degree of each substance in the cement three-phase composite system. High degree and novel method

Active Publication Date: 2020-04-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problem that existing methods cannot distinguish the reaction degree of silica fume and fly ash, the purpose of the present invention is to provide a kind of accurate determination of powder ash that provides guidance and theoretical basis for the design of high-performance and ultra-high-performance concrete. Method for the degree of reaction of each substance in a three-phase composite system of coal ash, silica fume and cement

Method used

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  • A method for measuring the reaction degree of each substance in a three-phase composite system of fly ash, silica fume and cement
  • A method for measuring the reaction degree of each substance in a three-phase composite system of fly ash, silica fume and cement
  • A method for measuring the reaction degree of each substance in a three-phase composite system of fly ash, silica fume and cement

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Embodiment 1

[0044]The cement used in this embodiment is P.II 52.5 Portland cement, the fly ash is grade I fly ash, the silica fume is 95 grade silica fume, the water reducer is polycarboxylate high-efficiency water reducer, and the water is tap water. Using cement: fly ash: water mass ratios of 75:25:35, 65:35:35 and 65:35:50 to form three kinds of cement slurry test blocks of 40mm×40mm×160mm, disassembled after 1 day The standard curing ages are 3 days, 7 days, and 28 days respectively. Take the central sample to pass the experiment and calculate that the unit fly ash reacts to produce 0.32 chemically bound water. Then form cement: fly ash: silica fume: water reducing agent: water mass ratio of 60:25:15:2:18 and mix ratio 40mm×40mm×160mm cement slurry test block.

[0045] After 28 days of hydration reaction, the cement hydration degree was determined to be 49.2% according to the quantitative x-ray diffraction analysis method; according to the thermogravimetric analysis, the chemically b...

Embodiment 2

[0048] The cement used in this embodiment is P.II 52.5 Portland cement, the fly ash is grade I fly ash, the silica fume is 95 grade silica fume, the water reducer is polycarboxylate high-efficiency water reducer, and the water is tap water. Using cement: fly ash: water mass ratios of 75:25:35, 65:35:35 and 65:35:50 to form three kinds of cement slurry test blocks of 40mm×40mm×160mm, disassembled after 1 day The standard curing ages are 3 days, 7 days, and 28 days respectively. Take the central sample to pass the experiment and calculate that the unit fly ash reacts to produce 0.32 chemically bound water. Then form cement: fly ash: silica fume: water reducing agent: water mass ratio of 60:25:15:2:18 and mix ratio 40mm×40mm×160mm cement slurry test block.

[0049] After 3 days of hydration reaction, the cement hydration degree was determined to be 47.7% according to the quantitative x-ray diffraction analysis method, and the chemically bound water content was 7.284% according t...

Embodiment 3

[0052] The cement used in this embodiment is P.II 52.5 Portland cement, the fly ash is grade I fly ash, the silica fume is 95 grade silica fume, the water reducer is polycarboxylate high-efficiency water reducer, and the water is tap water. Using cement: fly ash: water mass ratios of 75:25:35, 65:35:35 and 65:35:50 to form three kinds of cement slurry test blocks of 40mm×40mm×160mm, disassembled after 1 day The standard curing ages are 3 days, 7 days, and 28 days respectively. Take the central sample to pass the experiment and calculate that the unit fly ash reacts to produce 0.32 chemically bound water. Then molded cement: fly ash: silica fume: water reducer: water mass ratio of 50:35:15:2:18 cement slurry test block with a mixing ratio of 40mm××40mm×160mm.

[0053] After 28 days of hydration reaction, the cement hydration degree was determined to be 62.5% according to the quantitative x-ray diffraction analysis method, and the chemically bound water content was 8.228% accor...

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Abstract

The invention discloses a method for measuring the reaction degree of each matter in a coal ash-silica fume-cement three-phase composite system. The method comprises the following steps: with a coal ash and cement system and a coal ash, silica fume and cement system with certain ages as the raw materials, firstly replacing free water in the raw materials with an alcohol solution, and carrying outpower grinding and drying; carrying out thermogravimetric analysis so as to obtain the percentage contents of chemical bound water of the two raw materials, carrying out X-ray diffraction analysis soas to obtain cement hydration degrees of the two raw materials, and carrying out selective dissolving so as to obtain the masses of insoluble substances of the two raw materials; and calculating, so as to obtain the reaction degree of each matter in the coal ash and cement system and the coal ash, silica fume and cement system. The method has the beneficial effects that a testing result of a formula is accurate and reliable, the reaction degrees, which are difficult to be distinguished, of the silica fume and the coal ash in the three-phase composite system can be effectively distinguished, and powerful basis is provided for the design of high-performance and super-high-performance concrete structures.

Description

technical field [0001] The invention relates to the technical field of civil engineering materials, in particular to a method for measuring the reaction degree of each substance in a three-phase composite system of fly ash, silica fume and cement. Background technique [0002] Cement concrete is the most widely used and most used man-made material in society at present. Ultra-high performance concrete is a new type of cement-based material, which is characterized by ultra-high compressive strength and excellent anti-permeability. Due to its good performance, this material can meet many engineering applications in extreme environments. The high compressive strength and impermeability of ultra-high performance concrete benefit from the addition of mineral admixtures such as silica fume. At an extremely low water-binder ratio, the filler effect and size effect of silica fume are greatly reduced. Porosity and pore size in concrete structures. At present, the mineral admixtures...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00G01N23/207G01N1/28
CPCG01N1/286G01N5/00G01N23/207G01N2001/2866
Inventor 蒋金洋郑雪皎刘加平武胜萍
Owner SOUTHEAST UNIV