High-chlorine fly ash cementing material and preparation method thereof

A technology for cementitious materials and fly ash, applied in the field of building materials, can solve the problems of small water-cement ratio control range, high requirements on working performance and mechanical properties of cementitious materials, slow reaction speed, etc., so as to achieve a perfect hardening system, The effect of promoting chemical binding capacity and reducing transport capacity

Active Publication Date: 2021-06-15
广东能源集团科学技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual construction, the control range of the water-cement ratio is small, and the work performance and mechanical properties of the cementitious material are high, which leads to the limited improvement effect of the traditional method on the chloride ion erosion resistance of the cement paste.
Moreover, due to the high concentration of free chloride ions in high-chloride fly ash, whether it

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  • High-chlorine fly ash cementing material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The raw material of high chlorine fly ash cementitious material described in the present embodiment comprises:

[0037] 60 parts by weight of high chlorine fly ash, 40 parts by weight of slag, 10 parts by weight of silica fume, 10 parts by weight of rice husk ash, 5 parts by weight of drought strength agent, and 3 parts by weight of alkali activator.

[0038] The preparation method of described high chlorine fly ash cementitious material, comprises the steps:

[0039] (1) Dry the high-chlorine pulverized coal at 105°C until the moisture content is ≤1%;

[0040] (2) After high-chlorine fly ash, slag, silica fume and rice husk ash are ball milled respectively, mix them evenly;

[0041] (3) uniformly mixing the mixture obtained in step (2) with an early strength agent and an alkali activator to obtain the high-chloride fly ash cementitious material.

[0042] The specific surface area of ​​the high chlorine fly ash, slag, silica fume and rice husk ash after the ball milli...

Embodiment 2

[0044] The raw material of high chlorine fly ash cementitious material described in the present embodiment comprises:

[0045] 40 parts by weight of high chlorine fly ash, 60 parts by weight of slag, 30 parts by weight of silica fume, 20 parts by weight of rice husk ash, 1 part by weight of drought strength agent, and 1 part by weight of alkali activator.

[0046] The preparation method of described high chlorine fly ash cementitious material, comprises the steps:

[0047] (1) Dry the high-chlorine pulverized coal at 103°C until the moisture content is ≤1%;

[0048] (2) After high-chlorine fly ash, slag, silica fume and rice husk ash are ball milled respectively, mix them evenly;

[0049] (3) uniformly mixing the mixture obtained in step (2) with an early strength agent and an alkali activator to obtain the high-chloride fly ash cementitious material.

[0050] The specific surface area of ​​the high chlorine fly ash, slag, silica fume and rice husk ash after the ball milling...

Embodiment 3

[0052] The raw material of high chlorine fly ash cementitious material described in the present embodiment comprises:

[0053] 90 parts by weight of high chlorine fly ash, 30 parts by weight of slag, 20 parts by weight of silica fume, 30 parts by weight of rice husk ash, 3 parts by weight of drought strength agent, and 10 parts by weight of alkali activator.

[0054] The preparation method of described high chlorine fly ash cementitious material, comprises the steps:

[0055] (1) Dry the high-chlorine pulverized coal at 107°C until the moisture content is ≤1%;

[0056] (2) After high-chlorine fly ash, slag, silica fume and rice husk ash are ball milled respectively, mix them evenly;

[0057] (3) uniformly mixing the mixture obtained in step (2) with an early strength agent and an alkali activator to obtain the high-chloride fly ash cementitious material.

[0058] The specific surface area of ​​the high chlorine fly ash, slag, silica fume and rice husk ash after the ball mill...

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Abstract

The invention discloses a high-chlorine fly ash cementing material as well as a preparation method and application thereof. The preparation method of the high-chlorine fly ash cementing material comprises the following steps: (1) respectively carrying out ball milling on high-chlorine fly ash, slag and mineral micro-powder for 4-8 hours; (2) uniformly mixing the ball-milled high-chlorine fly ash, slag and mineral micro-powder; and (3) adding an early strength agent and an alkali activator into the mixture obtained in the step (2), and uniformly mixing to obtain the high-chlorine fly ash cementing material. The potential volcanic ash activity of the high-chlorine fly ash is excited through a composite activation process, namely physical and chemical activation methods, so that the optimal effect of curing chloride ions is achieved. According to the high-chlorine fly ash cementing material disclosed by the invention, the raw material components in the cementing material are mutually cooperated and excited to form rich hydration products, namely Friedel salt, AFt crystals and C-S-H gel, so that the chemical binding capacity of minerals and chloride ions in the hydration process and the physical adsorption capacity of the hydration products to the chloride ions are promoted, and meanwhile, the mechanical property of the high-chlorine fly ash cementing material is also improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a high-chlorine fly ash gelling material and a preparation method thereof. Background technique [0002] Fly ash is the main solid waste discharged during the power generation process of coal-fired power plants, and it is an artificial pozzolanic material. At present, the largest and most important way of comprehensive utilization of fly ash is still in construction and building materials, such as for the production of cement or as an admixture for concrete. The content of chloride ions in high-chloride fly ash is relatively high. If high-chloride fly ash is prepared as a cementitious material and used in concrete, it will have a certain impact on the durability of concrete. In ordinary environments, corrosive ions such as chloride ions migrate inwards through concrete cracks and capillary pores, causing destructive expansion such as steel corrosion and salt crystalli...

Claims

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Application Information

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IPC IPC(8): C04B7/28C04B7/26C04B7/153C04B7/36
CPCC04B7/243C04B7/1535C04B7/36Y02P40/10
Inventor 姚勇刘国军吴志超何玉海张文超汪牧
Owner 广东能源集团科学技术研究院有限公司
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