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Method for preparing nano-modified cement-based biomass material by using high-temperature calcined straw ash

A nano-modification and high-temperature calcination technology, which is applied in the field of building materials, can solve the problems of high preparation cost and poor sulfate corrosion resistance, and achieve improved corrosion resistance, improved compressive strength, and reduced ettringite and calcium hydroxide. Effect

Active Publication Date: 2019-07-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the preparation cost of cement-based materials in the prior art is relatively high, and the performance of sulfate erosion resistance is relatively poor. In order to solve the above technical problems, the present invention provides a nano-modified A method for cement-based biomass materials, which adopts different temperatures and calcination times to prepare straw ash with different activities, and adjusts its dosage to obtain cement-based biomass materials with excellent mechanical properties and sulfuric acid erosion resistance

Method used

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  • Method for preparing nano-modified cement-based biomass material by using high-temperature calcined straw ash
  • Method for preparing nano-modified cement-based biomass material by using high-temperature calcined straw ash
  • Method for preparing nano-modified cement-based biomass material by using high-temperature calcined straw ash

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Embodiment 1

[0045] Plant stalks are crushed and dried to obtain plant powder, which is placed in a ceramic crucible and calcined once at 200°C for 1 hour in a muffle furnace to obtain a sintered powder; the sintered powder prepared above is placed in a ceramic crucible Carry out secondary calcination treatment at 600°C for 6 hours in a muffle furnace to obtain straw ash; in parts by weight, mix 5 parts of acrylic monomer, 0.12 parts of sodium dodecylbenzenesulfonate and 8 parts of deionized water Stir to prepare a monomer emulsion, then add 1 part of nano-silica powder, ultrasonically disperse for 30 minutes at room temperature with a power of 500W, then add 0.1 part of initiator, stir and react at 60°C for 1 hour, cool to room temperature after the reaction, and filter. Wash the solid with absolute ethanol and deionized water in sequence, and dry it at 80°C to obtain a polymer-coated silica material;

[0046] Dissolve 1ml of tetraethyl orthosilicate in 50ml of absolute ethanol, add 3ml o...

Embodiment 2

[0048] Plant stalks are ground and dried to obtain plant powder, which is placed in a ceramic crucible and calcined once at 400°C for 3 hours in a muffle furnace to obtain a sintered powder; the sintered powder prepared above is placed in a ceramic crucible Carry out secondary calcination treatment at 600°C in a muffle furnace for 6 hours to obtain straw ash; in parts by weight, mix 13 parts of acrylic monomer, 0.15 parts of sodium dodecylbenzenesulfonate and 11 parts of deionized water Stir to prepare a monomer emulsion, then add 4 parts of nano-silica powder, ultrasonically disperse at room temperature for 30 minutes at 500W power, then add 0.5 part of initiator, stir and react at 90°C for 2 hours, cool to room temperature after the reaction, filter, Wash the solid with absolute ethanol and deionized water in sequence, and dry it at 80°C to obtain a polymer-coated silica material;

[0049] Dissolve 1ml of tetraethyl orthosilicate in 50ml of absolute ethanol, add 3ml of deion...

Embodiment 3

[0051] Plant stalks are crushed and dried to obtain plant powder, which is placed in a ceramic crucible and calcined once at 200°C for 1.5 hours in a muffle furnace to obtain a sintered powder; the sintered powder prepared above is placed in a ceramic crucible Carry out secondary calcination treatment at 600°C in a muffle furnace for 6 hours to obtain straw ash; in parts by weight, 7 parts of acrylic monomer, 0.13 parts of sodium dodecylbenzenesulfonate and 9 parts of deionized water Mix and stir to prepare a monomer emulsion, then add 2 parts of nano-silica powder, ultrasonically disperse for 30 minutes at room temperature with a power of 500W, then add 0.2 parts of initiator, stir and react at 70°C for 70 minutes, cool to room temperature after the reaction, and filter , washing the solid with absolute ethanol and deionized water in sequence, and drying at 80°C to obtain a polymer-coated silica material;

[0052] Dissolve 1ml of tetraethyl orthosilicate in 50ml of absolute e...

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Abstract

The invention provides a method for preparing a nano-modified cement-based biomass material by using high-temperature calcined straw ash. The method comprises the following steps: firstly, taking a plant straw as a raw material for calcination treatment; then putting the calcined powder into a muffle furnace for secondary calcination treatment to obtain straw ash; taking an acrylic monomer as theraw material and coating a polymer in situ on the surface of the nano-silica powder and preparing a silicon oxide powder on the surface of the polymer; and finally, mixing and grinding cement, flyash,the straw ash, a water-reducing agent and the obtained composite structure material according to weight parts to obtain the cement-based biomass material. The straw ash prepared by the method disclosed by the invention contains more water hardness active substances and greatly improves sulfate erosion resistance of cement mortar to a certain extent.

Description

[0001] Technical field: [0002] The invention relates to the field of building materials, in particular to a method for preparing nano-modified cement-based biomass materials by calcining straw ash at high temperature. [0003] Background technique: [0004] As countries gradually enter the era of urbanization and industrialization, the cement industry has become one of the largest industries in the world. In 2015, cement production exceeded 4 billion tons for the first time. The annual output of China's cement is 2.4 billion tons, accounting for 57.3% of the world's total output, and it is the country that produces the most cement in the world. Relevant data show that greenhouse gas emissions from the cement industry account for 15% of the entire industry. my country's carbon emissions are second only to the United States, accounting for 22% of the world's total carbon emissions from the cement industry. Nowadays, as the harm of the greenhouse effect to the environment bec...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/00C04B18/08C04B18/101C04B2103/302C04B14/06C04B24/161
Inventor 李琴飞赵耀陈衡侯鹏坤谢宁程新
Owner UNIV OF JINAN
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