Fly ash surface modification method and application in water-proof mortar

A technology of surface modification and surface modifier, applied in the field of waterproof mortar and fly ash surface modification, to achieve the effect of improving waterproof performance, reducing cement consumption and increasing strength

Inactive Publication Date: 2009-03-18
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Embodiment 1

[0015] Weigh 100g of dried fly ash in a container, heat the oil bath to 120°C, add 0.4g of stearic acid, stir at constant temperature for 2 hours, then add 0.5g of paraffin, stir at constant temperature for 10 minutes, pour out the fly ash. A surface-modified fly ash is obtained. Prepare mortar according to the following formula: cement 220g, sand 780g, hydroxypropyl cellulose ether 0.6g, water 140mL and stir well. Add 20g of modified fly ash and continue stirring to obtain waterproof mortar. The mass water absorption of the waterproof mortar decreased from 6.5% without fly ash to 3.1%, the flexural strength increased from 4.21MPa to 4.53MPa, and the compressive strength increased from 12.85MPa to 13.57MPa.

Embodiment 2

[0017] Weigh 100g of dried fly ash in a container, heat the oil bath to 90°C, add 5mL of ethanol solution of silane coupling agent (containing 0.2g of silane coupling agent), and stir at constant temperature for 1h to obtain surface-modified powder coal ash. Prepare mortar according to the following formula: cement 250g, sand 750g, hydroxypropyl cellulose ether 0.6g, water 150mL and stir well. Add 30g of modified fly ash and continue stirring to obtain waterproof mortar. The mass water absorption of the waterproof mortar decreased from 6.3% without fly ash to 3.7%, the flexural strength increased from 4.82MPa to 5.26MPa, and the compressive strength increased from 16.65MPa to 17.85MPa.

Embodiment 3

[0019] Weigh 100g of dried fly ash in a container, heat the oil bath to 150°C, add 5mL of titanate coupling agent solvent gasoline solution (containing 0.3g of titanate coupling agent), and stir at constant temperature for 3h, Then add 0.7g of paraffin, and stir at constant temperature for 10 minutes to obtain surface-modified fly ash. Prepare mortar according to the following formula: cement 300g, sand 700g, hydroxypropyl cellulose ether 0.4g, water 165mL and stir well. Add 50g of modified fly ash and continue stirring to obtain waterproof mortar. The mass water absorption of the waterproof mortar decreased from 6.0% without fly ash to 2.7%, the flexural strength increased from 5.64MPa to 6.17MPa, and the compressive strength increased from 22.35MPa to 24.03MPa.

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Abstract

The invention relates to a surface modification method of fly ash and application of modified fly ash in waterproof mortar and belongs to the technical field of building material. The method uses a modifier which is one or a mixture of a silane coupling agent, a titanate coupling agent, an aluminate coupling agent, a stearic acid and paraffin. 0.1 to 1.0 gram of the modifier is added into each 100 grams of fly ash. The surface modification method combines the waterproof functions of the fly ash and higher fatty acid and couples hydrophobic groups to the surface of the fly ash. The modified fly ash is applied to the waterproof mortar as a waterproof agent. When added with 1 to 5 percent of modified fly ash, the common mortar achieves obviously improved waterproof performance and increased strength with less cement consumption, and has, compared with a test specimen without fly ash, a 40 to 60 percent lower mass water absorption, improved bending strength and compressive strength.

Description

technical field [0001] The invention relates to a method for modifying the surface of fly ash and is applied to waterproof mortar, in particular to being used as a waterproof agent for waterproof mortar, and belongs to the technical field of building materials. Background technique [0002] Fly ash is the excrement of coal-fired power plants, and its main chemical composition is aluminosilicate. In my country, thermal power generation will still be the mainstream of power industry development for a long time to come. As a result, nearly 100 million tons of fly ash are discharged every year. At present, the utilization rate of fly ash in developed countries has reached as high as 70% to 80%. The current utilization rate in our country is only about 30%. The comprehensive utilization and development of fly ash is of great significance in terms of environmental protection, energy saving and resource utilization. [0003] The main component of fly ash contains SiO 2 and Al ...

Claims

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Application Information

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IPC IPC(8): C04B18/08C04B20/00
CPCC04B20/107C04B2111/27C04B18/08C04B2103/65C04B28/02Y02W30/91C04B20/1025C04B20/1044C04B20/1051C04B20/04C04B14/06
Inventor 毛明富陈明清龚雁刘士荣张建荣倪忠斌
Owner JIANGNAN UNIV
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