Crop straw composite cement-based thermal-insulating wall material and preparation method thereof

A technology of crop straw and composite cement, which is applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of low tensile strength, damaged fiber structure, poor durability of composite materials, etc., and achieve fiber Increased lignin content, low lignin content, and excellent mechanical strength

Active Publication Date: 2018-08-24
深圳市中筑营造建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent defects of cement, cement-based materials have the following problems: the tensile strength is low, far below its compressive strength; it is a typical brittle material, and its ability to resist external impact is poor; its crack resistance is poor, and there are A large number of temperature cracks and drying shrinkage cracks, and gradually develop into large cracks with the prolongation of service time, thus seriously affecting the durability and safety of the structure
[0005] However, since the calcium hydroxide produced during the cement hydration process will dissolve in the excess water in the matrix pores to form an alkaline solution, the presence of calcium hydroxide in the solution and the alkaline environment will degrade the hemicellulose and lignin in the fiber , thereby destroying the fiber structure, reducing its strength and toughness, forming voids after the fiber structure is destroyed, calcium hydroxide enters the interior of the fiber, deposits and crystallizes in the pores to mineralize the fiber, thus losing flexibility and easy fracture, and finally leading to the durability of the composite material The actual service life of the crop straw composite cement-based material is far lower than the design service life of the building
Then, when crop straw composite cement-based materials are used as thermal insulation wall materials, two or more repairs and replacements are required, which not only affects the use and thermal insulation effect, but also reduces the quality of the project; it also increases subsequent maintenance and maintenance. Replacement operation increases repair and maintenance costs, thus limiting its large-scale promotion and use

Method used

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  • Crop straw composite cement-based thermal-insulating wall material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The crop straw composite cement-based thermal insulation wall material of this embodiment is prepared by the following method:

[0038] 1) Take the wheat straw and cut it to a length of 20-40mm, then carry out steam explosion, the steam temperature is 185°C, the steam pressure is 2.8MPa, the pressure holding time is 3.0min, and the blasting material is obtained by releasing the pressure;

[0039] 2) According to the ratio of solid-liquid mass ratio of 1:4, immerse the blasting material obtained in step 1) into water at room temperature for 6 hours, then filter and extrude for solid-liquid separation, and obtain a water washing material and a washing liquid;

[0040] According to the ratio of solid-liquid mass ratio of 1:4, the obtained primary washing material was immersed in NaOH solution with a mass concentration of 0.8%, kept at 80°C for 2.5h, and after filtration and separation, the material was washed twice to neutral , dried at 65°C until the moisture content was ...

Embodiment 2

[0046] The crop straw composite cement-based thermal insulation wall material of this embodiment is prepared by the following method:

[0047] 1) Take the wheat straw and cut it to a length of 20-40mm, then carry out steam explosion, the steam temperature is 190°C, the steam pressure is 3.0MPa, the pressure holding time is 2.5min, and the blasting material is obtained by releasing the pressure;

[0048] 2) According to the ratio of solid-liquid mass ratio of 1:4.5, immerse the blasting material obtained in step 1) into water at room temperature for 5 hours, then filter and extrude for solid-liquid separation to obtain a water washing material and a washing liquid;

[0049] According to the ratio of solid-liquid mass ratio of 1:4.5, the obtained primary washing material was immersed in NaOH solution with a mass concentration of 1.0%, kept at 70°C for 2.0h, and after filtration and separation, the material was washed twice to neutral , dried at 65°C until the moisture content wa...

Embodiment 3

[0055] The crop straw composite cement-based thermal insulation wall material of this embodiment is prepared by the following method:

[0056] 1) Take the wheat straw and cut it to a length of 20-40mm, then carry out steam explosion, the steam temperature is 185°C, the steam pressure is 3.0MPa, the pressure holding time is 3.0min, and the blasting material is obtained by releasing the pressure;

[0057] 2) According to the ratio of solid-liquid mass ratio of 1:5, immerse the blasting material obtained in step 1) into water at room temperature for 4 hours, then filter and extrude for solid-liquid separation, and obtain a water washing material and a washing liquid;

[0058] According to the ratio of solid-liquid mass ratio of 1:5, the obtained primary washing material was immersed in NaOH solution with a mass concentration of 1.2%, kept at 60°C for 1.5h, and after filtration and separation, the material was washed twice to neutral , dried at 65°C until the moisture content was ...

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Abstract

The invention relates to a crop straw composite cement-based thermal-insulating wall material and a preparation method thereof. The crop straw composite cement-based thermal-insulating wall material is prepared by the preparation method comprising the following steps: (1) cutting off wheat straw and performing steam explosion to obtain an explosion material; (2) washing the explosion material withwater, soaking the washed explosion material in a NaOH solution, and then performing filtering separation, washing and drying to obtain wheat straw fiber; (3) performing silane coupling agent modification on the obtained wheat straw fiber, and then adding metakaolin, stirring and mixing to obtain a fiber premix; and (4) stirring and mixing the fiber premix, cement, polystyrene foam granules, a water reducing agent and water to obtain slurry, and performing pouring molding, standing demolding and maintaining on the slurry. The obtained light-weight thermal-insulating wall material is low in water absorption rate and high in water absorption softening coefficient on the basis that high mechanical property and high thermal insulation property are ensured; and after 50-times freezing and thawing cycle, the compressive strength loss rate does not exceed 10%, the quality loss rate does not exceed 5%, and the crop straw composite cement-based thermal-insulating wall material has high anti-frost property and high durability.

Description

technical field [0001] The invention belongs to the technical field of cement-based thermal insulation wall materials, and in particular relates to a crop straw composite cement-based thermal insulation wall material and a preparation method thereof. Background technique [0002] Cement-based materials are currently the most widely used building materials and have made outstanding contributions to the progress and development of human society. However, due to the inherent defects of cement, cement-based materials have the following problems: the tensile strength is low, far below its compressive strength; it is a typical brittle material, and its ability to resist external impact is poor; its crack resistance is poor, and there are A large number of temperature cracks and shrinkage cracks gradually develop into large cracks with the prolongation of service time, which seriously affects the durability and safety of the structure. [0003] In order to solve the above problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02C04B111/20C04B111/27C04B111/40C04B111/52C04B18/24
CPCC04B20/023C04B20/026C04B28/04C04B2111/27C04B2111/29C04B2111/40C04B2111/52C04B2201/20C04B2201/32C04B18/24C04B14/106C04B24/18C04B16/08Y02W30/91
Inventor 魏浩峰
Owner 深圳市中筑营造建设工程有限公司
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