Phosphogypsum-base wall material for cast-in-place wall

A wall material and cast-in-place wall technology, which is applied in the field of building materials, can solve problems such as failure to reflect material properties, and achieve the effects of delaying hydration hardening time, improving later strength, and reducing fluidity loss

Inactive Publication Date: 2014-01-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN200710051888 discloses "lightweight gypsum wall and its integral pouring method", Chinese patent CN2014247234Y discloses "a kind of gypsum powder pouring integral wall", Chinese patent CN1028398181 discloses "cast-in-place gypsum wall and its construction method" , the above-mentioned patent mainly emphasizes the overall pouring construction method of gypsum cast-in-place walls, in order to elaborate on the material components; "A Poured Gypsum Wall and Its Preparation Method", the above-mentioned patent mainly emphasizes the preparation of materials, but fails to reflect the performance of the materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: for the phosphogypsum-based wall material of cast-in-place wall, its raw material components are as follows by weight percentage:

[0017] β—phosphogypsum: 65%, fly ash: 10%, ordinary Portland cement: 24%, sodium citrate: 0.34%, naphthalene-based FDN water reducer: 0.5%, organic silicone oil: 0.08%, hydroxyethyl Cellulose (ether): 0.08%.

[0018] The β-phosphogypsum is a modified phosphogypsum prepared by mixing dihydrate phosphogypsum with 2% calcium carbide slag, grinding it in a ball mill for 15 minutes, and then calcining at 150° C. for 2 hours. Flexural strength ≥ 2.5MPa, compressive strength ≥ 5MPa, softening coefficient ≥ 0.35.

[0019] Take the above raw materials and mix them to obtain a phosphogypsum-based cast-in-situ wall material, add water according to the water-to-material ratio of 0.46 and mix well for construction. The basic properties of the phosphogypsum-based cast-in-place material obtained in the present invention are initial setting...

Embodiment 2

[0020] Embodiment 2: for the phosphogypsum-based wall material of cast-in-place wall, its raw material components are as follows by weight percentage:

[0021] β—phosphogypsum: 70%, fly ash: 12.5%, ordinary Portland cement: 16%, sodium citrate: 0.30%, naphthalene-based FDN water reducer: 1.0%, organic silicone oil: 0.1%, methyl cellulose Element (ether): 0.1%.

[0022] The β-phosphogypsum is a modified phosphogypsum prepared by mixing dihydrate phosphogypsum with 5% calcium carbide slag, grinding it in a ball mill for 15 minutes, and then calcining at 150° C. for 2 hours. Flexural strength ≥ 2.5MPa, compressive strength ≥ 5MPa, softening coefficient ≥ 0.35.

[0023] Take the above raw materials and mix them to obtain a phosphogypsum-based cast-in-situ wall material, add water according to the water-to-material ratio of 0.5 and mix well before construction. The basic properties of the phosphogypsum-based cast-in-place material obtained in the present invention are initial set...

Embodiment 3

[0024] Embodiment 3: for the phosphogypsum-based wall material of cast-in-situ wall, its raw material components are as follows by weight percentage:

[0025] β—phosphogypsum: 60.5%, fly ash: 18%, slag cement: 20%, citric acid: 0.5%, FDN water reducer: 0.75%, polyether defoamer: 0.15%, hydroxyethyl cellulose (Ether): 0.1%.

[0026] The β-phosphogypsum is a modified phosphogypsum prepared by mixing dihydrate phosphogypsum with 3% calcium carbide slag, grinding it in a ball mill for 15 minutes, and then calcining at 150° C. for 2 hours. Flexural strength ≥ 2.5MPa, compressive strength ≥ 5MPa, softening coefficient ≥ 0.35.

[0027] Take the above raw materials and mix them to obtain a phosphogypsum-based cast-in-situ wall material, add water according to the water-to-material ratio of 0.46 and mix well for construction. The basic properties of the phosphogypsum-based cast-in-place material obtained in the present invention are initial setting time ≥ 2.0h, final setting time ≤ 4...

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Abstract

The invention discloses a phosphogypsum-base wall material for a cast-in-place wall. The invention is characterized in that the material is prepared from the following raw materials in percentage by weight: 60-80% of beta-phosphogypsum, 10-20% of mineral admixture, 5-25% of cement, 0.25-0.5% of retarder, 0.05-0.15% of defoaming agent, 0.05-0.2% of thickener and 0.5-1% of water reducer. The raw materials are uniformly mixed to obtain the phosphogypsum-base cast-in-place wall material; and the material and water are mixed uniformly in a water/material ratio of 0.4-0.5 to obtain a slurry, and the slurry is cast in place and molded. The phosphogypsum-base wall material has the advantages of controllable setting time, low flowing loss rate, high utilization ratio of solid waste, low material cost and high strength, is convenient for construction, and can be widely used for frame-structure infilled internal walls of commercial and civil buildings.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a phosphogypsum-based wall material used for cast-in-place walls. Background technique [0002] Phosphogypsum is a solid waste mainly composed of calcium sulfate dihydrate discharged from the wet-process phosphoric acid production process. Normally, the production of 1 ton of P 2 o 5 It is necessary to discharge 4.5 to 5.5 tons of phosphogypsum. In recent years, with the continuous development of the phosphating industry, the discharge of phosphogypsum in my country has been increasing day by day. In 2009, the output of phosphogypsum in my country was about 50 million tons, and the cumulative stockpiled amount has exceeded 200 million tons, occupying a large amount of land resources. At present, domestic phosphogypsum is mainly dehydrated by high temperature heat treatment to generate β-hemihydrate gypsum. Due to the large water demand and low strength of β-hemihy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
Inventor 马保国郅真真蹇守卫卢斯文李玉博苏英茹晓红
Owner WUHAN UNIV OF TECH
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