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Construction powder and slurry for high-sulfur mixing pile as well as preparation and application of construction powder and slurry

A mixing pile, high-sulfur type technology, applied in the field of mixing piles, can solve the problems that gypsum mortar and gypsum board are easy to mold, affect the large-scale utilization of industrial by-product gypsum, and affect the application of industrial by-product gypsum, so as to save production energy consumption, The effect of excellent compressive strength

Inactive Publication Date: 2021-07-20
SHANGHAI RES INST OF BUILDING SCI CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The attached water content of industrial by-product gypsum is relatively high (10%-25%), it is acidic (pH=4-5), and the dosage in cement is very low (about 4%). These factors affect the industrial by-product gypsum in Extensive use in cement production; industrial by-product gypsum has high organic matter, soluble phosphorus, and fluorine content, and the produced gypsum mortar and gypsum board are prone to mold. These factors affect the application of industrial by-product gypsum in the gypsum building materials industry

Method used

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  • Construction powder and slurry for high-sulfur mixing pile as well as preparation and application of construction powder and slurry
  • Construction powder and slurry for high-sulfur mixing pile as well as preparation and application of construction powder and slurry
  • Construction powder and slurry for high-sulfur mixing pile as well as preparation and application of construction powder and slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The invention discloses a construction powder for high-sulfur mixing piles. The construction powder is tested by the sulfur trioxide test method of GB / T 176, and the sulfur trioxide content is 8-22%.

[0038] The construction powder is composed of the following raw materials in mass percentage (converted dry matter content ratio), industrial by-product gypsum 20-40%, red mud 10-20%, concrete mineral admixture 20-55%, cement 15-20% .

[0039] Among them, the industrial by-product gypsum is selected from any one or more compositions of phosphogypsum, citrate gypsum, titanium gypsum, and salt gypsum, and the content of calcium sulfate dihydrate in the industrial by-product gypsum is ≥ 75%, and the water content is 10% -25%. The concrete mineral admixture is one or more combinations of ground mineral powder, ground fly ash, ground natural zeolite and silica fume that meet the requirements of GB / T 18736.

[0040] Further, the construction powder for high-sulfur mixing pile...

Embodiment 2

[0055] S1. Selection of raw materials: Phosphogypsum, red mud, high-strength and high-performance concrete mineral admixtures, cement, and muddy silty clay are collected from the site and transported back to the laboratory. Among them, the muddy silty clay has a natural water content of 40%, is dried at a temperature of 105-110°C to constant weight, is ground in a laboratory Φ50×50cm standard grinding machine, and passed through a 1.25mm sieve for use.

[0056] S2. Proportion of gypsum and red mud: Take phosphogypsum and red mud powder and make mixtures with different weight ratios, and measure the pH value of the mixture according to GB5085. See table below.

[0057] Phosphogypsum: red mud 1:0 2:1 1:1 1:2 0:1 pH value 4.2 9.0 10.5 12.0 13.2

[0058] Since the liquid phase formed by ettringite is suitable for pH=12, and the slag powder and high-calcium fly ash in cement and high-strength high-performance concrete mineral admixtures all have high a...

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Abstract

The invention relates to the technical field of mixing piles, in particular to construction powder and slurry for a high-sulfur type mixing pile and preparation and application of the construction powder and slurry. The construction material comprises a powder form and a slurry form, and the sulfur trioxide content is 8-22% through detection of a sulfur trioxide test method of GB / T 176. According to the invention, the raw materials are reasonably selected and mixed, and two low-value solid wastes are adopted for double doping and relatively large in dosage, wherein the powder only needs to dry industrial byproduct gypsum, the slurry does not need to be dried and calcined, a large amount of production energy consumption is saved, the construction material is applied to mixing pile reinforcing soil and can replace cement, the compressive strength reaches or is even superior to that of cement soil, and application and popularization prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of stirring piles, in particular to a construction powder and slurry for high-sulfur type stirring piles and its preparation and application. Background technique [0002] The underground soil layer in Shanghai and other coastal areas along the river is weak, low in strength, and high in water content. Before excavation of the foundation pit of underground engineering, construction techniques such as deep mixing method and high-pressure jet grouting method must be used for foundation pit enclosure to form a temporary Mixing pile retaining wall. These construction techniques currently generally use P·O42.5 cement as the construction powder, and the amount of cement is quite large. In Shanghai alone, 8 million tons of cement are consumed for foundation pit enclosure and mixing piles each year, which is equivalent to half of the cement consumption of all commercial concrete in Shanghai. After the underground e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/04
CPCC04B28/143C04B28/142C04B18/0409C04B2201/50Y02W30/91
Inventor 李阳韩云婷
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD