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Q-phase aluminate cement expanding agent and preparation method thereof

A technology of phase aluminate and expansion agent is applied in the field of Q-phase aluminate cement expansion agent and its preparation, which can solve the problems of inability to compensate the late shrinkage of cement-based materials, and achieve the advantages of being beneficial to mass production, compensating for late shrinkage, Simple formula for effect

Inactive Publication Date: 2014-04-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the existing sulphoaluminate expansion agent with ettringite as the expansion source cannot compensate for the shrinkage of cement-based materials in the middle and late stages, the present invention provides a kind of hydration speed that not only has the advantages of fast hydration, but also has Q-phase aluminate cement expansion agent with advantages of middle and late expansion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of Q-phase cement clinker: Prepare 1000 grams of Q-phase cement raw material with a ratio of 52.57% bauxite, 38.35% limestone and 9.08% dolomite; crush it with a jaw crusher, then enter it into a planetary mill for grinding, and shape it , and then calcined in a silicon carbon rod electric furnace, the normal heating rate (10°C / min), the firing temperature is controlled at 1250-1300°C, and the holding time is 30min; the Q-phase cement clinker is obtained, and the content of the Q-phase aluminate minerals is 80%, CA content is 15%, C 12 A 7 The content is 5%;

[0025] Preparation of cement expansion agent containing Q-phase aluminate: Prepare 400 grams of raw materials according to the ratio of 60% Q-phase cement clinker and 40% industrial dihydrate gypsum; respectively crush the Q-phase cement clinker and industrial dihydrate gypsum, Mix evenly then; Adopt planetary mill to carry out pulverization, particle size is controlled at passing through 200 mesh sq...

Embodiment 2

[0028] Preparation of Q-phase cement clinker: Prepare 1000 grams of Q-phase cement raw material with a ratio of 50% bauxite, 40% limestone and 10% dolomite; crush it with a jaw crusher, then enter it into a planetary mill for grinding, and shape it , and then calcined in a silicon carbon rod electric furnace, the normal heating rate (10°C / min), the firing temperature is controlled at 1250-1300°C, and the holding time is 30min; the Q-phase cement clinker is obtained, and the content of the Q-phase aluminate minerals is 90%, CA content is 5%, C 12 A 7 The content is 5%;

[0029] Preparation of cement expansion agent containing Q-phase aluminate: prepare 400 grams of raw materials according to the ratio of 50% Q-phase cement clinker and 50% industrial dihydrate gypsum; crush the Q-phase cement clinker and industrial dihydrate gypsum respectively, Mix evenly then; Adopt planetary mill to carry out pulverization, particle size is controlled at passing through 200 mesh square hole...

Embodiment 3

[0032] Preparation of Q-phase cement clinker: Prepare 1000 grams of Q-phase cement raw material with a ratio of 54% bauxite, 36% limestone and 8% dolomite; crush it with a jaw crusher, then enter it into a planetary mill for grinding, and shape it , and then calcined in a silicon carbon rod electric furnace, the normal heating rate (10°C / min), the firing temperature is controlled at 1250-1300°C, and the holding time is 30min; the Q-phase cement clinker is obtained, and the content of the Q-phase aluminate minerals is 85%, CA content is 10%, C 12 A 7 The content is 5%;

[0033] Preparation of cement expansion agent containing Q-phase aluminate: prepare 400 grams of raw materials according to the ratio of 40% Q-phase cement clinker and 60% industrial dihydrate gypsum; crush the Q-phase cement clinker and industrial dihydrate gypsum respectively, Then mix evenly; then mix evenly; adopt planetary mill to carry out pulverization, particle size is controlled at passing through 200...

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Abstract

The invention relates to a Q-phase aluminate cement expanding agent and a preparation method thereof, which belong to the technical field of additives of cement and concrete materials. The Q-phase aluminate cement expanding agent consists of 60-40 percent of Q-phase cement clinker and 40-60 percent of industrial dihydrate gypsum, wherein the Q-phase cement clinker contains 80-99.9 percent of Q-phase aluminate minerals. Compared with concrete prepared by using the conventional expanding agent (a sulfoaluminate expanding agent taking ettringite as an expanding source), concrete prepared by using the Q-phase aluminate cement expanding agent has the advantages that: the free swell ratio at middle and later periods is increased remarkably; in particular, the free swell ratio is much higher than that of the conventional expanding agent 30 days later; and later-period contraction of concrete can be compensated.

Description

technical field [0001] The invention relates to a Q-phase aluminate cement expansion agent and a preparation method thereof, belonging to the technical field of admixtures for cement and concrete materials. Background technique [0002] Cement expansion agent is a chemical admixture that is added to cement. When the cement sets and hardens, its volume expands to compensate for shrinkage, tension the steel bars to generate prestress, and fully fill the cement gap. At present, although the traditional sulphoaluminate expansion agent with ettringite as the expansion source has the advantage of fast hydration speed, its expansion mainly occurs before 7 days, and it is difficult to compensate for the late shrinkage of cement-based materials. and other shortcomings. Contents of the invention [0003] In order to solve the technical problem that the existing sulphoaluminate expansion agent with ettringite as the expansion source cannot compensate for the shrinkage of cement-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/14
Inventor 姜奉华
Owner UNIV OF JINAN