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Phosphogypsum based high flow state grouting material

A grouting material and high fluidity technology, applied in the field of building materials, can solve the problems of low flexural strength, poor water resistance, poor construction performance, etc., to improve water resistance and durability, reduce costs, and realize resource utilization Effect

Inactive Publication Date: 2015-05-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary cement-based grouting materials have low flexural strength and large volume shrinkage, which will cause microcracks, resulting in no close contact between the bearing plate and the grouting material; slow strength development, affecting machine stability and service life; long setting time , affecting the progress of the project
Chinese patent CN102503318A discloses a high flexural cement-based grouting material, the 28d flexural strength exceeds 16MPa, but it does not overcome the shrinkage of the cement itself
Chinese patent CN101921086A discloses a cement-based ultra-high-strength non-shrinkage grouting material, whose compressive strength is increased to more than 70MPa at room temperature for 1 day, and more than 120MPa for 28 days without shrinkage, but its setting time is too long
Chinese patent CN102173709A discloses a gypsum-based grouting material with adjustable properties. Natural building gypsum is used to prepare the grouting material. The setting time is short and there is no shrinkage, but the strength is low and the construction performance is not good.
However, due to the low strength and poor water resistance of phosphogypsum, the prepared grouting materials also have these shortcomings.

Method used

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  • Phosphogypsum based high flow state grouting material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 220g (54 parts) of phosphorus-based high-strength gypsum, 150g (30 parts) of secondary fly ash, 20g (4 parts) of carbide slag, 25g (5 parts) of ordinary Portland cement, 35g (7 parts) of dihydrate gypsum whiskers parts), protein retarder 0.5g (0.1 parts), polycarboxylate superplasticizer 1.5g (0.3 parts), hydroxypropyl methylcellulose ether 0.4g (0.08 parts), silicone water repellent 0.25 g (0.05 parts), put it into a homogenizer and mix evenly, mix the obtained powder with 180g water (the ratio of water to material is 0.36:1), and stir evenly through a slurry mixer to obtain a phosphogypsum-based high-flow grouting material.

Embodiment 2

[0039]Weigh 300g (60 parts) of phosphorus-based high-strength gypsum, 130g (26 parts) of primary fly ash, 20g (4 parts) of carbide slag, 20g (4 parts) of sulphoaluminate cement, 30g (6 parts) of dihydrate gypsum whiskers parts), sodium citrate and protein retarder mixture 0.75g (0.15 parts), melamine-based water reducer 2.0g (0.4 parts), carboxymethyl cellulose ether and starch ether mixture 0.4g (0.08 parts), 0.25g (0.05 parts) of silicone water repellent, put into a homogenizer and mix evenly, mix the obtained powder with 190g water (water-material ratio is 0.38:1), and stir evenly through a slurry mixer to obtain a phosphogypsum-based High fluidity grouting material.

Embodiment 3

[0041] Weigh 240g (48 parts) of phosphorus-based high-strength gypsum, 170g (34 parts) of secondary fly ash, 25g (5 parts) of carbide slag, 25g (5 parts) of slag cement, 40g (8 parts) of dihydrate gypsum whiskers, 0.25g (0.05 parts) of the mixture of citric acid and protein retarder, 2.5g (0.5 parts) of naphthalene-based superplasticizer, 0.4g (0.08 parts) of the mixture of hydroxypropyl methylcellulose ether and starch ether, silicone Water-repellent 0.25g (0.05 part), put into the homogenizer and mix evenly, mix the obtained powder with 175g water (water-material ratio is 0.37:1), stir evenly through the slurry mixer, get phosphogypsum-based high flow grouting material.

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Abstract

The invention discloses a phosphogypsum based high flow state grouting material. The phosphogypsum based high flow state grouting material is composed of the following components in parts by weight: 50-70 parts of phosphorus based semi-hydrated gypsum, 20-40 parts of coal ash, 8-12 parts of compound activator, 6-10 parts of gypsum whisker, 0.05-0.15 part of retarder, 0.2-0.6 part of water reducing agent, 0.04-0.08 part of water retaining agent and 0.02-0.06 part of water repellent. Wherein, the phosphorus based semi-hydrated gypsum is phosphorus based high-strength gypsum or a mixture of the phosphorus based high-strength gypsum and phosphorus based building gypsum with a mass ratio of 4:1 to 5:1. The grouting material is prepared from the phosphogypsum in the invention to achieve the resource utilization of the phosphogypsum, and is green and environmentally friendly. The coal ash is used as a mineral admixture, and acetylene sludge and cement are used as an alkali activator to reduce the cost and well improve the water resistance and durability of the grouting material, and the gypsum whisker is used for modifying the grouting material to improve the breaking strength of the grouting material.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a phosphogypsum-based high-flow grouting material. Background technique [0002] Phosphogypsum is an industrial by-product of the wet production of phosphoric acid, which is composed of apatite or fluorine-containing apatite Ca 5 F(PO 4 ) 3 One of the products obtained by reacting with sulfuric acid, the reaction is as follows: [0003] Ca 5 F(PO 4 ) 3 +5H 2 SO 4 +10H 2 O→3H 3 PO 4 +5(CaSO 4 2H 2 O)+HF [0004] Phosphate rock reacts with sulfuric acid to form a muddy mixture, which contains phosphoric acid in liquid state and calcium sulfate residue in solid state. After filtering and washing, phosphoric acid and calcium sulfate can be separated, and the calcium sulfate residue obtained is phosphorus. plaster. The main component of phosphogypsum is calcium sulfate dihydrate, every ton of P 2 o 5 Discharge about 5 tons of phosphogypsum. The...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B14/38C04B18/30
CPCY02W30/91
Inventor 马保国金子豪苏英郅真真贺行洋李显良卢文达
Owner WUHAN UNIV OF TECH
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