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Plastic expanding agent used for cement base material shrinkage and compensation, its preparation method and its application

A technology of cement-based materials and plastic expansion agents, which is applied in the field of plastic expansion agents for shrinkage compensation of cement-based materials and its preparation and application, can solve problems affecting the performance and interface properties of cement-based materials, and achieve crack prevention and good compatibility The effect of high utilization rate of performance and expansion performance

Inactive Publication Date: 2012-06-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the tensile stress exceeds a certain limit, early settlement and cracking are more likely to occur, which greatly affects the performance and interface properties of cement-based materials

Method used

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  • Plastic expanding agent used for cement base material shrinkage and compensation, its preparation method and its application
  • Plastic expanding agent used for cement base material shrinkage and compensation, its preparation method and its application
  • Plastic expanding agent used for cement base material shrinkage and compensation, its preparation method and its application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]

[0042]The plastic expansion agent for shrinkage compensation of cement-based materials prepared in the above ratio is mixed into C40 concrete according to 10% of the amount of cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is 0%, the 28d free expansion rate reaches 0.15%, and the 28-day compressive strength is increased by 5% compared with the benchmark concrete.

Embodiment 2

[0044]

[0045] The plastic expansion agent for shrinkage compensation of cement-based materials prepared in the above ratio is mixed into C40 concrete according to 10% of the amount of cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is -0.11%, the 28-day free expansion rate reaches 0.10%, and the 28-day compressive strength is 15% lower than that of the reference concrete.

Embodiment 3

[0047]

[0048]

[0049] The plastic expansion agent for shrinkage compensation of cement-based materials prepared in the above ratio is mixed into C40 concrete according to 10% of the amount of cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is -0.05%, the 28-day free expansion rate reaches 0.15%, and the 28-day compressive strength is 18% lower than that of the benchmark concrete.

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Abstract

The invention relates to a novel plastic expanding agent used for cement base material shrinkage and compensation, concretely relates to the concrete expanding agent which is capable of generating expansion in a plastic phase to compensate cement base material shrinkage in the plastic phase, and continuously generating certain expansion in a hardening phase to compensate the anaphase shrinkage and cracking of the cement base material. The plastic expanding agent comprises the following ingredients by weight part: 2-30 parts of kelp powder or seaweed powder, 5-35 parts of calcium sulphoaluminate expanding agent, 0.005-0.5 parts of air-entrainer, 0.2-1 part of neopentylene glycol, 0-1.2 parts of micro synthesized fiber, 10-40 parts of levigated slag powder and 5-30 parts of bentonite. The plastic expanding agent can be widely used in the cement base materials of cement mortar, concrete, grouting materials, repairing mortar and the like, and can be used in concrete engineering of water conservancy, electric power, building, transportation and the like.

Description

technical field [0001] The invention relates to a new type of plastic expansion agent for shrinkage compensation of cement-based materials, in particular to a plastic expansion agent that not only produces expansion in the plastic stage to compensate for the shrinkage of cement-based materials in the plastic stage, but also continuously produces a certain expansion in the hardening stage to compensate for the later stage of cement-based materials. A concrete expansion agent for shrinkage compensation of cement-based materials that shrinks and cracks. It can be widely used in cement-based materials such as cement mortar, concrete, and grouting materials, and can be used in concrete projects in the fields of water conservancy, electric power, construction, and transportation. Background technique [0002] One of the essential characteristics of cement-based materials, such as cement mortar, concrete and grouting materials, cement-based self-leveling materials and other special ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/02
Inventor 蒋正武黎良青邓子龙
Owner TONGJI UNIV
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