Cement-slag powder gel system with desulfurized gypsum as excitant

A technology of desulfurized gypsum and slag powder, applied in the field of building materials, can solve the problems of low utilization rate and poor prospect of desulfurized gypsum, and achieve the effect of stable development

Inactive Publication Date: 2009-01-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the geographical characteristics of our country, the demand for gypsum products is not large, and the natural gypsum deposits are

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, the cement-slag gelling system using desulfurized gypsum as the activator, is prepared by weight ratio: cement 30, slag powder 65 and desulfurized gypsum 5. The resulting product is mixed with water. When the water-binder ratio is 0.5, the compressive strengths of the gelling systems 3d, 7d and 28d are 17.8MPa, 34.2MPa and 45.6MPa, respectively. The strength of 60d can reach 58.6MPa.

Embodiment 2

[0021] Example 2, the cement-slag gelling system using desulfurized gypsum as the activator, is prepared by weight ratio: cement 25, slag powder 65 and desulfurized gypsum 10. The resulting product is mixed with water. When the water-binder ratio is 0.5, the compressive strengths of the gelling systems 3d, 7d and 28d are: 17.0MPa, 35.9MPa and 47.3MPa, respectively. The strength of 60d can reach 53.4MPa.

Embodiment 3

[0022] Example 3, the cement-slag gelling system using desulfurized gypsum as the activator, is prepared by weight ratio: cement 20, slag 72.5 and desulfurized gypsum 7.5. The obtained product is mixed with water. When the water-binder ratio is 0.5, the compressive strengths of the gelling systems 3d, 7d and 28d are 18.1MPa, 34.4MPa and 46.9MPa, respectively. The 60d strength can reach 60.9MPa.

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Abstract

The invention relates to a cement-slag powder cementing material system which adopts the desulfurization gypsum as an activator, belonging to the technical field of the building materials. The cement-slag powder cementing material system is composed of cement, slag powder and desulfurization gypsum. With the cement-slag powder cementing material system adopted, on the condition that the proportion of the slag powder is 60 percent to 90 percent, the early mechanical properties can reach the standard of the cement of P.O 42.5 grade, and the later strength develops stably. The cement-slag powder cementing material system can be used to prepare a cementing system of very high green degree, and can effectively avoid the problem that the early strength of the high-blending slag powder cementing system develops slowly, for the problem affects the process and the quality of the project. The cement-slag powder cementing material system is applicable to being used as the raw material in the commercial concrete mixing station and the commercial mortar mixing station, and is more suitable for preparing the marine concrete and the sulfate resistant mortar in the project.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement-slag powder gelling system using desulfurized gypsum as an activator. Background technique [0002] During the "Eleventh Five-Year Plan" period, focus on economic development, to ensure that the energy consumption per 10,000 yuan of GDP is reduced by about 20% compared with 2005, the water intake of 10,000 yuan of industrial added value is reduced by 35%, and the GDP output of 15 major mineral resources is increased by about 20%; The recycling amount of renewable resources will increase by more than 65%, and the utilization rate of industrial solid waste will increase to more than 60%. In the concrete industry, to achieve this goal, it is possible to increase the replacement rate of cement by mineral admixtures. However, due to the low early activity of most mineral admixtures, the early strength of the cementitious system is low, which limits Its...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/12C04B22/14
CPCC04B2111/24C04B2111/23C04B28/02Y02W30/91C04B18/141C04B22/145
Inventor 孙振平庞敏
Owner TONGJI UNIV
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