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Method for improving frost resistance of excess-sulfate phosphogypsum slag cement product

A technology of slag cement and phosphogypsum, which is applied in the field of building materials, can solve the problems that cement concrete products cannot be applied, is unfavorable for wide-scale promotion, and has high additive dosage, achieves important economic and environmental benefits, is beneficial to environmental protection, and has a simple process. Effect

Inactive Publication Date: 2016-10-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are few literatures about the antifreeze performance of phosphogypsum slag cement in my country, and the patent (200710133461.6) named as a kind of environmental protection and energy-saving concrete antifreeze discloses a kind of antifreeze by adding rubber powder, magnesium oxide and alum. The concrete antifreeze agent made by applying the antifreeze agent in concrete can improve the frost resistance of concrete while ensuring the slump. Although this patent provides a solution to enhance the frost resistance of cement, the antifreeze The amount of rubber powder and alum in the composition of the freezing agent is too large, the amount of additives is high, and the cost is high, which is not conducive to large-scale promotion, and is not suitable for all types of cement concrete products

Method used

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  • Method for improving frost resistance of excess-sulfate phosphogypsum slag cement product
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  • Method for improving frost resistance of excess-sulfate phosphogypsum slag cement product

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Embodiment 1～7

[0025] A method for improving the antifreeze performance of phosphogypsum slag cement products, comprising the following steps:

[0026] 1) Preparation of persulfophosphogypsum slag cement products: After mixing phosphogypsum, slag powder, and cement clinker powder (P.O 42.5 cement) according to the proportioning conditions described in Table 1, add standard sand, and then press "cement mortar "Strength Test Method" (ISO method) (GB / T17671-1999) to form a persulfur gypsum slag cement mortar test block;

[0027] 2) Carbonization curing: the obtained phosphogypsum slag cement mortar test block was maintained in the air for 3 days, then placed in normal temperature water for 14 days, and then placed in an air atmosphere with a volume concentration of carbon dioxide of 20% for 28 days. After another 25 freeze-thaw cycles, the strength of the samples at each stage was tested, and the results are shown in Table 2.

[0028] Table 1 Formula of persulfur gypsum slag cement products

...

Embodiment 8～10

[0034] A method for improving the antifreeze performance of phosphogypsum slag cement products, comprising the following steps:

[0035] 1) Preparation of persulfur gypsum slag cement products: After mixing phosphogypsum, slag powder, and cement clinker powder (P.O 42.5 cement) according to the ratio described in Table 3, add standard sand (mortar ratio is 1:3), Then according to the "Cement Mortar Strength Test Method" (ISO method) (GB / T 17671-1999) type, the persulfur gypsum slag cement mortar test block is obtained;

[0036] 2) Carbonization curing: the obtained phosphogypsum slag cement mortar test block was cured in the air for 3 days, then placed in normal temperature water for 14 days, and then placed in a carbon dioxide volume concentration of 10-30% (see Table 4). Continue curing in the air atmosphere for 28 days, and then go through 25 freeze-thaw cycles to test the strength of the samples at each stage.

[0037] Table 3 Formula of persulfur gypsum slag cement produ...

Embodiment 11～13

[0043] A method for improving the antifreeze performance of phosphogypsum slag cement products, comprising the following steps:

[0044] 1) Preparation of persulfur gypsum slag cement products: After mixing phosphogypsum, slag powder, and cement clinker powder (P.O 42.5 cement) according to the proportioning conditions described in Table 3, add standard sand, and then press "cement mortar "Strength Test Method" (ISO method) (GB / T17671-1999) to form a persulfur gypsum slag cement mortar test block;

[0045] 2) Carbonization curing: the obtained phosphogypsum slag cement mortar test block was cured in the air for 3 days, then placed in normal temperature water for 3 days, 7 days, and 14 days, and then placed in air with a volume concentration of carbon dioxide of 20%. Continue curing in the atmosphere for 28 days, and then go through 25 freeze-thaw cycles to test the strength of the samples at each stage. The results are shown in Table 5.

[0046] It can be seen from Table 5 th...

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Abstract

The invention belongs to the field of building materials and particularly relates to a method for improving frost resistance of an excess-sulfate phosphogypsum slag cement product. The excess-sulfate phosphogypsum slag cement product is prepared from phosphogypsum, cement clinker powder, slag powder, sand and water. A sulfur-phosphorus gypsum slag cement product is put in an air condition with the concentration of carbon dioxide being 10%-30% to be cured, the internal structure of the product is changed through a carbonization reaction of the sulfur-phosphorus gypsum slag cement product by means of carbon dioxide, a compact structure is obtained, and the frost resistance is improved. The process of the method is simple, high-temperature curing is not required, energy consumption is little, the amount of doped clinker powder is small, the cost is low, secondary pollution cannot be caused, a large quantity of industrial waste slags such as phosphogypsum can be used, and the method has important environmental and economic benefits.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for improving the antifreeze performance of phosphogypsum slag cement products. Background technique [0002] Phosphogypsum is an industrial by-product of wet process production of phosphoric acid in the phosphating industry, and its main component is dihydrate gypsum (Ca 2 SO 4 2H 2 O), usually dihydrate gypsum in phosphogypsum is 85-95%, and contains a small amount of phosphorus, fluorine, organic matter and other impurities, and its content is related to the composition of phosphate rock used in production. At present, the annual by-production of phosphogypsum in my country is more than 80 million tons, only about 20% of which are utilized. A large amount of phosphogypsum is stored as solid waste. The accumulated accumulated phosphogypsum has exceeded 200 million tons. cause environmental pollution. Accelerating the resource utilization of phosphogypsu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/02C04B11/30
CPCC04B11/30C04B40/0231C04B28/143
Inventor 林宗寿韩亚
Owner WUHAN UNIV OF TECH
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