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Early-strength sulphoaluminate cement paste capable of being easily pumped, and preparation method thereof

A technology of sulphoaluminate cement and strong sulphoaluminate, which is applied in the field of cement performance adjustment, can solve the problems that it is difficult to meet the construction process requirements of construction projects, the setting time is not easy to control, and the loss of fluidity is fast, so as to shorten the initial setting and final setting time, promote the secondary hydration reaction, and promote the effect of setting and hardening

Inactive Publication Date: 2018-08-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, some shortcomings of sulfoaluminate cement limit its wide application, such as concentrated hydration heat release, rapid loss of fluidity, difficult control of setting time, and uneven slurry, which make it difficult to meet the construction process requirements of construction projects.

Method used

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  • Early-strength sulphoaluminate cement paste capable of being easily pumped, and preparation method thereof
  • Early-strength sulphoaluminate cement paste capable of being easily pumped, and preparation method thereof
  • Early-strength sulphoaluminate cement paste capable of being easily pumped, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Sulphoaluminate cement accounts for 80% of the total mass of the cementitious material, and fly ash accounts for 20% of the total mass of the cementitious material, and 0.0125wt.% lithium carbonate (chemically pure reagent) is added outside; first lithium carbonate is mixed with water Evenly, then pour the cementitious material, put it on the cement slurry mixer and stir slowly for four minutes, test the initial setting and final setting time of the cement slurry, fluidity, and test the compressive strength of the cement slurry within 28 days strength.

[0028] like Figures 1 to 3 As shown, when the amount of lithium carbonate was 0.0125wt.%, the initial setting and final setting time of the cement slurry were significantly shortened, and the fluidity of the cement slurry was slightly reduced (the influence of the fluidity was very small). The compressive strength continued to increase.

Embodiment 2

[0030] Sulphoaluminate cement accounts for 80% of the total mass of the cementitious material, and fly ash accounts for 20% of the total mass of the cementitious material, and 0.025wt.% lithium carbonate (chemically pure reagent) is added outside; first lithium carbonate is mixed with water Evenly, then pour the cementitious material, put it on the cement slurry mixer and stir slowly for four minutes, test the initial setting and final setting time of the cement slurry, fluidity, and test the compressive strength of the cement slurry within 28 days strength.

[0031] Test situation: if Figures 4 to 6 As shown, when the amount of lithium carbonate was 0.025wt.%, the initial setting and final setting time of the cement slurry were significantly shortened, and the fluidity of the cement slurry was slightly reduced (the influence of the fluidity was very small), and at the same time within 28 days of age The compressive strength continued to increase.

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Abstract

The invention provides an early-strength sulphoaluminate cement paste capable of being easily pumped, and a preparation method thereof. The accumulation of industrial waste materials can be reduced, the practical input of cement can be reduced, and economic cost is lowered. The preparation method for the early-strength sulphoaluminate cement paste capable of being easily pumped is characterized inthat the sulphoaluminate cement paste is taken as a base stock, high-calcium fly ash is taken as modifier, and lithium carbonate is taken as modified modifier to be blended to obtain the early-strength sulphoaluminate cement paste, wherein the mass ratio of the sulphoaluminate cement, the high-calcium fly ash to lithium carbonate is (75-85):(15-25):(0.01-0.025). According to the early-strength sulphoaluminate cement paste, the initial setting time and the final setting time of the sulphoaluminate cement can be obviously shortened, in addition, the fluidity of the cement can not be excessivelyaffected, the secondary hydration reaction of the high-calcium fly ash can be fully accelerated, and the compressive strength of the sulphoaluminate cement paste base material can be effectively enhanced.

Description

technical field [0001] The invention belongs to the technical field of cement performance adjustment, and in particular relates to an early-strength sulphoaluminate cement slurry which is easy to pump and a preparation method thereof. technical background [0002] Sulphoaluminate cement is the cement clinker with anhydrous calcium sulphoaluminate and dicalcium silicate as the main mineral components obtained by calcining raw materials with appropriate components, mixed with different amounts of limestone and appropriate amount of gypsum to grind together production. According to different purposes and use environments of special applications, different varieties of sulphoaluminate cement can be formed by adjusting the amount of limestone and gypsum. For this reason, sulfoaluminate cement has a lot of variability, and by adjusting these constituent materials, cement and concrete with different functional properties can be produced. [0003] However, some shortcomings of sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B18/08C04B22/10
Inventor 桂雨郭大卫廖宜顺刘高鹏鞠家佳袁正夏
Owner WUHAN UNIV OF SCI & TECH
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