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High-performance cement expansive material

An expansion agent and concrete technology, applied in the field of building materials, can solve the problems affecting the early strength of concrete, large slump loss, etc., and achieve the effects of good expansion effect, reduced shrinkage rate, and enhanced crack resistance.

Inactive Publication Date: 2009-02-04
蔡九德 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current concrete expansion agent still has the disadvantages of affecting the early strength of concrete, large slump loss and obvious drying shrinkage in the later stage.

Method used

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  • High-performance cement expansive material
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: MgO in the calcium clinker is 15%, CaO is 65%; MgO in the expansion agent is 4.5%, MgO and CaO are 10%, and the balance is aluminum material and calcium sulfate, aluminum material and sulfuric acid Calcium forms ettringite. When mixed with cement, the expansion agent accounts for 6% of the total.

Embodiment 2

[0052] Embodiment 2: MgO in the calcareous clinker is 14%, CaO is 70%; MgO in the expansion agent is 4%, MgO and CaO are 11%, and the balance is aluminum material and calcium sulfate, aluminum material and sulfuric acid Calcium forms ettringite. When mixed with cement, the expansion agent accounts for 7% of the total.

Embodiment 3

[0053] Embodiment three: the MgO in the calcareous clinker is 13%, and the CaO is 75%; the MgO in the expansion agent is 3%, MgO and CaO are 12%, and the balance is aluminum material and calcium sulfate, aluminum material and sulfuric acid Calcium forms ettringite. When mixed with cement, the expansion agent accounts for 8% of the total.

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Abstract

The invention belongs to the technical field of building materials and relates to a high-performance concrete expansion agent which is composed of calcium clinker, aluminium material and calcium sulfate by mixing and matching, the calcium clinker contains magnesium oxide which is not more than 5 percent of the total weight, calcium oxide and magnesium oxide of 7 to 12 percent; the aluminium material and the calcium sulfate form ettringite. The high-performance expansion agent of the invention adopts the mutual action of three expansion sources of the CaO, the ettringite and the MgO and simultaneously carries out the utilization, the expansion of the three are appropriately combined to make up for deficiencies of each other, thereby obtaining the most appropriate expansion amount and the expansion exertion, better compensating the concrete shrinkage, improving the anti-crack effect of a product, overcoming the shortcoming of volumetric shrinkage and improving the durability of a building and the safety of the use.

Description

【Technical field】 [0001] The invention belongs to the technical field of building materials, in particular to a high-performance concrete expansion agent. 【Background technique】 [0002] As we all know, volume stability is one of the key factors affecting the performance and life of cement-based materials, and it is also the basis for the safe use of buildings. The cracking of building concrete is a very common phenomenon, and it has become a major technical problem facing the high performance of cement-based materials. [0003] The newly implemented cement standard has aggravated the temperature shrinkage and drying shrinkage of concrete. Due to the new standard in order to meet the demand of early strength of concrete, the cement clinker batching is promoted to high C 3 S, high C 3 The development of A and high specific surface area, coupled with the low water-cement ratio of high-performance pumping concrete, high cement content, and the use of ultra-fine mineral admix...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B22/06
CPCC04B22/008
Inventor 蔡九德江云安
Owner 蔡九德
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