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Cement concrete strength promoter and preparation method thereof

A technology of cement concrete and accelerator, applied in the field of building materials, can solve the problems of large water absorption, less than 10% utilization rate of phosphogypsum, environmental pollution, etc., and achieve the effect of improving strength

Active Publication Date: 2015-02-04
JIANGMEN XINHUI DISTRICT TIANHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's annual emissions are about 80 million tons, and the cumulative accumulation of phosphogypsum has exceeded 500 million tons. For every ton of phosphoric acid produced, about 5 tons of phosphogypsum will be produced. Currently, the utilization rate of phosphogypsum is less than 10%. Fluoride, free phosphoric acid, P 2 o 5 Impurities such as phosphate and phosphate are the main factors that cause environmental pollution during the storage of phosphogypsum
After proper calcination and grinding of kaolin, metakaolin can be obtained. Metakaolin contains a large amount of active silicon and aluminum. It is a very effective strength accelerator, but its water absorption is large, which may easily increase the water demand of concrete. , or reduce the workability of concrete, so it is difficult to obtain good comprehensive benefits when used alone

Method used

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  • Cement concrete strength promoter and preparation method thereof
  • Cement concrete strength promoter and preparation method thereof
  • Cement concrete strength promoter and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019]A cement concrete strength accelerator, it is made up of cement slurry dehydration phase, metakaolin, phosphogypsum, and water reducer, and its weight percentage of each component is as shown in Table 1, wherein, the cement slurry dehydration phase follows the steps Preparation: 1) Firstly, the waste concrete is separated and crushed to a certain extent, the large aggregates are removed, and the waste cement slurry is selected, and then crushed, ground and sieved, and the sieve of 0.075mm sieve is taken , which is the powder; 2) The obtained powder was calcined at a temperature of 750°C for 4 hours, and rapidly cooled to room temperature at a cooling rate of 50°C / min to obtain a dehydrated cement slurry phase. Metakaolin is prepared according to the following steps: 1) First, put a large piece of kaolin into a ball mill for 30 minutes of grinding to obtain kaolin powder; 2) Calcinate the kaolin powder at a temperature of 700°C for 6 hours, and put it into a ball mill afte...

Embodiment 2

[0029] A cement concrete strength accelerator, the weight percentage of each component is shown in Table 1, wherein the cement paste dehydration phase is prepared according to the following steps: 1) Firstly, the waste concrete is separated and crushed to remove large pieces Aggregate, select the waste cement slurry, and then after crushing and grinding for 30 minutes, sieve, and take the sieve of 0.075mm sieve, which is the powder; 2) Put the obtained powder at a temperature of 1000℃ Calcined for 0.5 hours, then rapidly cooled to room temperature at a cooling rate of 80°C / min to obtain a dehydrated cement paste phase. Metakaolin is prepared according to the following steps: 1) First, put a large piece of kaolin into a ball mill for 20 minutes of grinding to obtain kaolin powder; 2) Calcinate the kaolin powder at a temperature of 1000°C for 1 hour, cool it and put it into a ball mill Medium grinding for 20min until the specific surface area is 8000m 2 / kg to get metakaolin. ...

Embodiment 3-6

[0033] A cement concrete strength accelerator, the weight percentage of each component is shown in Table 1, wherein the cement paste dehydration phase is prepared according to the following steps: 1) Firstly, the waste concrete is separated and crushed to remove large pieces Aggregate, select the waste cement slurry, and then after crushing, grinding, sieving, take the sieve of 0.075mm sieve, which is the powder; 2) Calcinate the obtained powder at a temperature of 500°C for 6 Hours, rapidly cooled to room temperature at a cooling rate of 120°C / min to obtain the dehydrated phase of the cement slurry. Metakaolin is prepared according to the following steps: 1) Firstly, put a large piece of kaolin into a ball mill for 40 minutes of grinding to obtain kaolin powder; 2) Calcinate the kaolin powder at a temperature of 550°C for 4 hours, and put it into Grind in a ball mill for 25 minutes until the specific surface area is 15000m 2 / kg to get metakaolin. The preparation process of...

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Abstract

The invention specifically relates to a cement concrete strength promoter and a preparation method thereof, belonging to the technical field of building materials. The cement concrete strength promoter is prepared from the following raw materials by weight: 10 to 60 parts of a cement mortar dehydrated phase, 15 to 70 parts of metakaolin, 1 to 50 parts of phosphogypsum, 0.1 to 5 parts of a water reducer and the like. According to the invention, since solid waste is used as a raw material, full and high-added value utilization of the solid waste is realized, and the prepared cement concrete strength promoter can effectively improve the strength of cement concrete at early, middle and later stages. The cement concrete strength promoter is used to substitute 5 to 15% of cement, and the strength of obtained cement concrete is improved by more than 40% in 28 d compared with the strength of reference concrete. The cement concrete strength promoter provided by the invention has the advantages of low cost for the raw materials and convenience in usage and can be extensively applied in rush-pair projects for ports and piers, highways, railways, bridges, airfield runways and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement concrete strength accelerator and a preparation method thereof. Background technique [0002] High early strength concrete is developed along with the ever-increasing construction requirements and use requirements of construction projects. In recent years, with the high-rise, long-span, lightweight, underground and harsh use environment of modern buildings, higher requirements have been placed on the strength and durability of concrete, making high-strength and high-performance concrete rapidly develop. In project construction, improving project quality and reducing project cost are common contradictions. Under the premise of ensuring project quality, shortening the construction period can not only open up traffic in advance, but also reduce a lot of maintenance and construction costs. High-strength concrete was applied earlier in foreign countri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B22/14
Inventor 水中和陆建鑫田素芳王桂明丁沙曾潇
Owner JIANGMEN XINHUI DISTRICT TIANHAI
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