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High-intensity and super-sulphur ardealite slag cement concrete and preparation method thereof

A slag cement and concrete technology, applied in the field of building materials, can solve the problems of concrete strength reduction, early strength reduction, delaying ettringite, etc., and achieve the effect of shortening the setting time, improving early strength, and easy mixing

Active Publication Date: 2018-09-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the cementitious material is hydrated to a certain extent and has a certain strength, due to the delayed formation of ettringite, it will cause local volume expansion and eventually lead to cracking.
Secondly, phosphorus, fluorine, and various organic impurities in phosphogypsum will react with calcium ions in the slurry when the phosphogypsum-based cementitious material is hydrated to form insoluble matter that adheres to the surface of phosphogypsum and hinders the continuous dissolution and dissolution of phosphogypsum. Hydration, or weaken the intermolecular force in the cementitious material, thereby prolonging the setting time of phosphogypsum and its products and reducing the early strength
In addition, there are many kinds of cementitious materials compounded in phosphogypsum-based cement concrete, and the agglomeration of cementitious materials is serious, which will reduce the hydration area of ​​concrete, and the hydration products with strength will be less, resulting in a decrease in concrete strength. It will also cause uneven distribution of cementitious materials, and the delayed ettringite generation in local areas of concrete is much higher than in other areas, causing serious cracking of concrete

Method used

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  • High-intensity and super-sulphur ardealite slag cement concrete and preparation method thereof
  • High-intensity and super-sulphur ardealite slag cement concrete and preparation method thereof
  • High-intensity and super-sulphur ardealite slag cement concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] To prepare a high-strength ultra-sulfur phosphogypsum slag cement concrete, the raw materials used are: phosphogypsum (average particle size 0.5mm) dried in an oven at 40°C until the moisture content is less than 0.1%, S95 grade slag powder, first-grade pulverized coal Ash (average particle size about 20 μm), P.O.42.5 cement produced by Huaxin Cement Factory, polycarboxylate water reducer (solid content 20%), sand with a particle size of less than 5 mm, stones with a particle size of 5 to 25 mm, and water. Concrete preparation method steps are as follows:

[0039] 1) Phosphogypsum ball milling pretreatment: put 3000g of phosphogypsum, 20g of fly ash, 40g of cement, 18.36g of water reducer and 1683g of water in a ball mill tank for wet grinding for 20min, then sieve out and perform aging treatment for 8h to obtain phosphorus gypsum slurry;

[0040] 2) Preparation of supersulfophosphogypsum slag cement concrete: Add 8.55Kg sand, 12.8Kg stone and 0.43Kg water into the con...

Embodiment 2

[0042] To prepare a high-strength ultra-sulfur phosphogypsum slag cement concrete, the raw materials used are: phosphogypsum (average particle size 0.5mm) dried in an oven at 40°C until the moisture content is less than 0.1%, S95 grade slag powder, first-grade pulverized coal Ash (average particle size about 20 μm), P.O.42.5 cement produced by Huaxin Cement Factory, polycarboxylate water reducer (solid content 20%), sand with a particle size of less than 5 mm, stones with a particle size of 5 to 25 mm, and water. Concrete preparation method steps are as follows:

[0043] 1) Phosphogypsum ball milling pretreatment: put 3000g of phosphogypsum, 20g of fly ash, 40g of cement, 18.36g of water reducer and 1683g of water in a ball mill tank for wet grinding for 20min, then sieve out and perform aging treatment for 8h to obtain phosphorus gypsum slurry;

[0044] 2) Preparation of supersulfophosphogypsum slag cement concrete: Add 8.55Kg sand, 12.8Kg stone and 0.43Kg water into the con...

Embodiment 3

[0046] To prepare a high-strength ultra-sulfur phosphogypsum slag cement concrete, the raw materials used are: phosphogypsum (average particle size 0.5mm) dried in an oven at 40°C until the moisture content is less than 0.1%, S95 grade slag powder, first-grade pulverized coal Ash (average particle size about 20 μm), P.O.42.5 cement produced by Huaxin Cement Factory, polycarboxylate water reducer (solid content 20%), sand with a particle size of less than 5 mm, stones with a particle size of 5 to 25 mm, and water. Concrete preparation method steps are as follows:

[0047] 1) Phosphogypsum ball milling pretreatment: put 3000g of phosphogypsum, 20g of fly ash, 40g of cement, 18.36g of water reducer and 1683g of water in a ball mill tank for wet grinding for 20min, then sieve out and perform aging treatment for 8h to obtain phosphorus gypsum slurry;

[0048] 2) Preparation of supersulfophosphogypsum slag cement concrete: Add 8.55Kg sand, 12.8Kg stone and 0.43Kg water into the con...

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Abstract

The invention relates to high-intensity and super-sulphur ardealite slag cement concrete and a preparation method thereof. The high-intensity and super-sulphur ardealite slag cement concrete is prepared by the following method with the steps of (1) ardealite ball milling pretreatment: putting ardealite, fly ash, cement, water reducing agents and water into a ball milling tank to perform wet milling; then performing sieving and aging treatment to obtain ardealite slurry; (2) high-intensity and super-sulphur ardealite slag cement concrete preparation: adding sand, stone coarse aggregates and water into a concrete stirring machine for stirring; after the uniform mixing, adding fine aggregate cement and mineral powder into the concrete stirring machine for continuous stirring; after the uniform stirring, slowly adding the ardealite slurry; finally adding water and water reducing agents; after the sufficient stirring, performing concrete shaping and maintenance, thus obtaining the high-intensity and super-sulphur ardealite slag cement concrete. The high-intensity and super-sulphur ardealite slag cement concrete provided by the invention has the advantages of high intensity, short setting time, good volume stability and difficult cracking.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a preparation method of high-strength supersulfur phosphogypsum slag cement concrete. Background technique [0002] Phosphogypsum is mainly the solid waste residue produced by the wet process of phosphoric acid production in phosphoric acid plants, detergent plants and other chemical fertilizers and daily chemical fields. Its main component is calcium sulfate dihydrate, and it also contains a small amount of phosphorus, fluorine compounds and organic matter. Important renewable gypsum resource. At present, phosphogypsum is mainly used in construction gypsum, cement retarder and gypsum bricks, etc. Although there are many ways to use phosphogypsum, the actual utilization effect is not ideal. For example, in 2016, the production of phosphogypsum reached 76 million tons, but the utilization The volume is only 27.7 million tons, and the utilization rate is only 36.5%. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/34
CPCC04B28/143C04B2111/343C04B2201/50C04B18/08C04B7/02C04B2103/302C04B22/002C04B14/06C04B14/02C04B18/141
Inventor 王桂明颜秉建孙涛盖珂瑜
Owner WUHAN UNIV OF TECH
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