A seed crystal for improving early strength of concrete and its application

An early strength and concrete technology, applied in the field of building materials, can solve the problems of insufficient concrete strength, concrete cracking, steel bar corrosion, etc., and achieve the effect of accelerating the setting and hardening speed, reducing processing costs, and improving early strength

Active Publication Date: 2011-12-28
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chloride admixtures, such as sodium chloride and calcium chloride, can improve the early strength of cement, but the presence of chloride ions will corrode steel bars and cause concrete cracking; sulfate admixtures, such as sodium sulfate, can increase The early strength of cement, but too much mixing will cause the concrete to swell and crack in the lat

Method used

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  • A seed crystal for improving early strength of concrete and its application
  • A seed crystal for improving early strength of concrete and its application
  • A seed crystal for improving early strength of concrete and its application

Examples

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Example Embodiment

[0011] Example 1

[0012] The present invention is a seed crystal used to improve the early strength of concrete, which is made of cement stone after grinding, and the specific surface area of ​​the crushed and ground cement seed is 8000m 2 / kg. Among them, the cement stone for preparing the seed crystals is ordinary Portland cement mixed with 3% by mass of sodium chloride and cured for a certain age, and the curing time is 35 days.

[0013] The invention uses a seed crystal for improving the early strength of concrete, and the specific surface area obtained by grinding cement stone is 8000m 2 / kg of seed crystals are added to the concrete, the mixing amount of the seed crystals is 1% of the concrete mass, and the mixing ratio of the concrete is: cement: fine aggregate: water=1:2.5:0.5.

Example Embodiment

[0014] Example 2

[0015] The present invention is a seed crystal for improving the early strength of concrete, which is made of cement stone after grinding. The specific surface area of ​​the crushed and ground cement seed is 10000m 2 / kg. Wherein, the cement stone for preparing the seed crystal is obtained by curing for a certain age after adding 3% by mass calcium chloride to ordinary Portland cement, and the curing time is 50 days.

[0016] The present invention uses a seed crystal for improving the early strength of concrete, and the specific surface area obtained by grinding cement stone is 10000m 2 / kg of seed crystals are added to the concrete, the mixing amount of the seed crystals is 3% of the concrete mass, and the mixing ratio of the concrete is: cement: fine aggregate: water = 1:2.5:0.5.

Example Embodiment

[0017] Example 3

[0018] The present invention is a seed crystal for improving the early strength of concrete, which is made of cement stone after grinding, and the specific surface area of ​​the crushed and ground cement seed is 15000m 2 / kg. Among them, the cement stone for preparing the seed crystals is ordinary Portland cement mixed with 3% by mass of sodium sulfate and cured for a certain age, and the curing time is 35 days.

[0019] The invention uses a seed crystal for improving the early strength of concrete, and the specific surface area obtained by grinding cement stone is 15000m 2 / kg of seed crystals are added to the concrete, the mixing amount of the seed crystals is 1% of the concrete mass, and the mixing ratio of the concrete is: cement: fine aggregate: water=1:2.5:0.5.

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Abstract

The invention discloses a crystal seed used for improving concrete early stage strength, and an application thereof. The crystal seed is characterized in that: the crystal seed is prepared from grinded cement stones, wherein the specific surface area of the crushed and grinded crystal seed is 8000 to 15000m<2>/kg. The cement stones are obtained through steps that: a certain amount of inorganic salt is doped into common portland cement, and the mixture is cured for a certain age, such that the cement stones are obtained. The application of the crystal seed comprises steps that: the crystal seed is added to concrete, wherein an adoption amount takes 0.8 to 3% of the mass of the concrete. The crystal seed is an additive with advantages of cheap price, good quality, and environment friendliness. When the crystal seed is added to concrete, early stage strength of concrete is improved, and later stage strength of concrete is ensured. Therefore, durability of concrete is improved.

Description

technical field [0001] The invention relates to a building material, in particular to a crystal seed for improving the early strength of concrete and its application. Background technique [0002] The so-called crystal seed means to form a crystal nucleus by adding an insoluble additive, that is, a seed crystal, to accelerate or promote the growth of enantiomer crystals with the same crystal form or stereo configuration, thereby increasing the early strength. It is a special Early strengthening agent. Crystal seeds have the following functions in concrete. On the one hand, it can reduce the nucleation barrier of hydration products in the early stage of cement hydration, induce rapid hydration of cement, thereby improving the early strength of concrete and speeding up the construction progress of concrete projects; on the other hand , due to the acceleration of the early hydration of cement, it can provide more favorable activity for the mineral admixture to stimulate the ex...

Claims

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Application Information

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IPC IPC(8): C04B22/00
Inventor 柳俊哲贺智敏李玉顺张国良陈剑斌
Owner NINGBO UNIV
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