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Nano cement-based crystal-nucleated early strength agent and preparation method and application thereof

A cement-based, early-strength agent technology, applied in the field of concrete admixtures, can solve the problems of poor compatibility between nano-based crystal nucleus-type early-strength agents and concrete, and achieve optimized cement stone pore structure, good compatibility, The effect of accelerating the hydration process

Active Publication Date: 2019-10-08
WUHAN UNIV OF TECH
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Problems solved by technology

[0005] In view of this, the present invention aims to propose a preparation method of nano cement-based crystal nucleus type early strength agent, to solve the problem of poor compatibility between existing nanometer crystal nucleus type early strength agent and concrete

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  • Nano cement-based crystal-nucleated early strength agent and preparation method and application thereof

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Embodiment Construction

[0023] With the development of nanotechnology, it is found that in cement-based materials, the incorporation of nanomaterials can improve the early strength of concrete. However, nanoparticles are very easy to agglomerate, and if they cannot be well dispersed and compatible with concrete, the early strength cannot be effectively improved; at the same time, the cost of nanomaterials such as nano-silica, nano-calcium carbonate, and carbon nanotubes is high, which will seriously restrict its use. Promotion and application in the construction industry. Therefore, in order to enhance the compatibility between the early strength agent and concrete and reduce production costs, the present invention provides a nano-cement-based crystal nucleus type early-strength agent, which uses nano-scale cement to provide crystal nuclei for the hydration of cement-based materials. Induce its rapid hydration; the median particle size of the prepared nano-cement-based crystal nuclei is 50-100nm. Whe...

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Abstract

The invention provides a nano cement-based crystal-nucleated early strength agent and a preparation method and application thereof. The nano cement-based crystal-nucleated early strength agent mainlycomprises, by weight, 20-35 parts of cement, 1-3 parts of a dispersant, 0.5-1 part of a retarder, and 64.5-79.5 parts of water. Nano cement is used to provide a crystal nucleus for hydrating of the cement-based material herein, the crystal nucleus induces rapid hydration of the cement-based material; after the nano cement is added to the cement-based material, pore structure and induced nucleatingcan be improved to arrive at early strength; in addition, no harmful ions are introduced, the early strength agent herein is well compatible with cement and never causes alkali-aggregate reaction, scumming and the like.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a nano cement-based crystal nucleus type early strength agent and its preparation method and application. Background technique [0002] Concrete early strength agent is a very common concrete admixture, it can promote the early hydration of cement and improve the early strength of concrete. Now there is a great demand for early strength agent in the direction of precast concrete assembly structure. Traditional accelerators can be divided into three types according to their composition: organic type, inorganic type and compound type. There are still many problems in these early strength agents, such as easy to cause corrosion of steel bars, alkali-aggregate reaction or blooming. In addition, the new generation of accelerators provide crystal nucleus inducers for the early stage of cement hydration, which will reduce the nucleation barrier of early hydration products, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B103/10
CPCC04B40/0039C04B2103/10C04B7/02C04B24/163C04B24/06C04B24/10
Inventor 谭洪波张迅邓秀峰李懋高聂康峻贺行洋苏英
Owner WUHAN UNIV OF TECH
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