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Application of hydrated calcium silicate fiber to prepare aerated concrete blocks

A hydrated calcium silicate, aerated concrete technology, applied in the application, home appliances, ceramic products and other directions, can solve the problem that polypropylene fiber reduces the compressive strength of aerated concrete blocks and affects the strength stability of aerated concrete blocks , low addition of polypropylene fibers, etc., to achieve the effect of promoting technology development, promoting quality improvement and reducing consumption, and improving mechanical strength

Active Publication Date: 2017-12-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the uniform distribution of admixtures such as polypropylene fibers in the air-entrained concrete block is the key to improving the mechanical strength of the product, and its addition amount and agent addition method must be strictly controlled. Enhanced effect; and the addition of too high will cause polypropylene fibers to agglomerate and reduce the compressive strength of aerated concrete blocks
In addition, polypropylene fibers are sensitive to sunlight and oxygen, are easy to deteriorate and decompose, and have weak adhesion to the cement matrix, thus affecting the stability of the later strength of the aerated concrete block

Method used

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  • Application of hydrated calcium silicate fiber to prepare aerated concrete blocks
  • Application of hydrated calcium silicate fiber to prepare aerated concrete blocks
  • Application of hydrated calcium silicate fiber to prepare aerated concrete blocks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] step 1):

[0060] Be that 0.4 and liquid-solid ratio are 15mL / g preparation slurry according to calcium-silicon molar ratio, add the NaOH of 20g / L to adjust the pH value of slurry (pH is 13); Gained suspension slurry is put into pressure reactor, stir Raise the temperature to 160°C, and react at a constant temperature under 0.6MPa pressure for 2 hours; after the reaction, cool the slurry to room temperature, take out the slurry, and obtain the product (calcium silicate hydrate fiber additive) after solid-liquid separation, washing and drying . The obtained product was subjected to XRD and SEM analysis. The main mineral composition of the product is mullite, quartz and calcium silicate hydrate gel. The calcium silicate hydrate fiber has a diameter of 0.1-0.5 μm, a length of 1-5 μm, and an aspect ratio of 20-30; the calcium-silicon atomic ratio of the calcium silicate hydrate fiber is 0.75.

[0061] Step (2):

[0062] The pouring slurry content (in parts by weight) is...

Embodiment 2

[0065] step 1):

[0066] Be 0.8 and liquid-solid ratio according to calcium-silicon mole ratio be 25mL / g preparation slurry, add the NaOH of 10g / L to adjust the pH value of slurry (pH is 13); Gained suspension slurry is put into pressure reactor, stir Raise the temperature to 180°C, and react at a constant temperature under a pressure of 1.3MPa for 1.0h; after the reaction, cool the slurry to room temperature, take out the slurry, and after solid-liquid separation, washing and drying, the product (calcium silicate hydrate fiber additive ). The obtained product was subjected to XRD and SEM analysis. The main phases of the product are mullite, quartz, tobermullite, and calcium silicate hydrate gel. The calcium silicate hydrate fiber has a diameter of 0.01-0.1 μm, a length of 3-5 μm, and an aspect ratio of 50-100; the calcium-silicon atomic ratio of the calcium silicate hydrate fiber is 0.75.

[0067] Step (2):

[0068] The pouring slurry content (in parts by weight) is: 50 p...

Embodiment 3

[0071] step 1):

[0072] Be 1.0 and liquid-solid ratio according to calcium-silicon molar ratio be 20mL / g preparation slurry, add the NaOH of 5g / L to adjust the pH value of slurry (pH is 12); Gained suspension slurry is put into pressure reactor, stir Raise the temperature to 200°C, and react at a constant temperature under a pressure of 1.3MPa for 0.5h; after the reaction, cool the slurry to room temperature, take out the slurry, and after solid-liquid separation, washing and drying, the product (calcium silicate hydrate fiber additive ). The obtained product was subjected to XRD and SEM analysis. The main phases of the product are mullite, quartz, calcium silicate hydrate gel, tobermullite. The calcium silicate hydrate fiber has a diameter of 0.01-0.1 μm, a length of 1-3 μm, and an aspect ratio of 50-100; the calcium-silicon atomic ratio of the calcium silicate hydrate fiber is 0.75.

[0073] Step (2):

[0074] The pouring slurry content (in parts by weight) is: 50 parts...

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Abstract

The invention relates to an application of hydrated calcium silicate fiber to prepare aerated concrete blocks, and belongs to the technical field of green energy-saving building materials. The hydrated calcium silicate fiber is used as an additive for producing aerated concrete blocks. The diameter of hydrated calcium silicate fiber is 0.01-0.5 mum, the length is 0.5-5 mum, and the calcium-to-silicon atomic ratio is 0.5-2. It is found through many researches that by using hydrated calcium silicate fiber having a certain structure as a mineralizing inducer of an aerated concrete hydration process, tobermorite can be induced to form in a production process, and the overall performance of the product (that is the aerated concrete blocks) is improved. The hydrated calcium silicate fiber is a reaction product of hydro-thermal synthesis of a thick liquid which is made of a siliceous raw material and a calcareous raw material. The hydrated calcium silicate fiber is simple in preparation process and low in cost. In a low addition of the hydrated calcium silicate fiber, tobermorite can be induced to form in the aerated concrete blocks, so that the mechanical strength of the aerated concrete blocks is improved.

Description

technical field [0001] The invention relates to a method for preparing an aerated concrete block by using calcium silicate hydrate fiber additive, and belongs to the technical field of green energy-saving building materials. Background technique [0002] Air-entrained concrete blocks are mainly composed of calcium silicate hydrate gel, tobermolite, and splash garnet. A new type of energy-saving building material with certain seismic performance. Usually, the compressive strength of air-entrained concrete blocks is 2.5-5MPa, and the bulk density is 500-700kg / m 3 , generally used for filling walls of buildings, masonry with higher strength can also be used for exterior walls. The production technology of aerated concrete blocks has become mature in Europe, the United States and Japan, while the domestic production technology is in the stage of catching up with and surpassing Western countries as a whole. At present, the main problems of the aerated concrete block products p...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B14/46
CPCC04B14/465C04B28/02C04B2201/20C04B2201/50C04B18/08C04B22/143C04B22/064C04B22/04C04B38/02
Inventor 李光辉姜涛曹鹏旭彭志伟罗骏张元波饶明军张鑫
Owner CENT SOUTH UNIV
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