Ultralow apparent density anti-cracking cement-based material and preparation method thereof

A cement-based material and apparent density technology, applied in ceramic products, other household appliances, applications, etc., can solve problems such as difficult repair, easy cracking of non-load-bearing walls, easy cracking of cement-based materials, etc., and achieve long foam stabilization time , Inhibit shrinkage cracking, low cost effect

Inactive Publication Date: 2014-05-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to disclose a light-weight polystyrene board that can replace flammable materials, which can be used for external wall insulation, roof insulation, and non-load-bearing wall production, and can solve the problems of easy cracking and difficult repair of cement-based materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First measure 500 kg of cement, 150 kg of water, CaCl 2 14 kilograms, polypropylene fiber 0, plant fiber 0, coagulant A 70 kilograms, water reducing agent 1.5 kilograms, then they are stirred and mixed, obtain slurry.

[0026] Then take the foaming agent in parts by weight: water = 1:80, then mix the foaming agent and water evenly, pour it into a foaming machine to foam, and obtain a foam solution, and let the foam solution stand for 5-8 minutes to obtain a foam .

[0027] Then, foam is added in the slurry of the first step, and the blending volume of foam reaches 239kg / m with wet bulk density 3 Standardize, stir evenly, obtain ultra-low apparent density cement-based material, pour into shape, standard curing 28d, keep humidity greater than 95% before demoulding. Detect that the apparent density of ultra-low apparent density cement-based materials is 150kg / m 3 , its compressive strength can reach 0.111MPa, its flexural strength is 0.032MPa, and its thermal conductivi...

Embodiment 2

[0029] First measure 500 kg of cement, 150 kg of water, CaCl 2 14 kilograms, 0 kilograms of polypropylene fiber, 0 kilograms of plant fiber, 70 kilograms of coagulant B, 1 kilogram of water reducing agent, fully mix and stir, obtain slurry.

[0030] Then take the foaming agent in parts by weight: water = 1:50, pour the foaming agent and water into the foaming machine to foam, and let it stand for 5-8 minutes to obtain foam. Add the foam to the above uniformly stirred slurry, and then stir evenly, and the measured wet bulk density reaches 235kg / m 3 Stop adding foam at this time and pour the mold into the standard curing for 28 days, and keep the humidity above 95% before demoulding.

[0031] The apparent density of ultra-low apparent density cement-based materials is 148kg / m 3 , its compressive strength can reach 0.15MPa, its flexural strength is 0.044MPa, and its thermal conductivity is 0.05W / (m·K).

[0032] As a comparative example, on the basis of the above proportioning ...

Embodiment 3

[0034] First measure 500 kg of cement, 150 kg of water, CaCl 2 1 kg, polypropylene fiber 0, plant fiber 0, coagulant B 45 kg, water reducing agent 1 kg, fully mixed and stirred evenly to obtain a slurry.

[0035] Then take the foaming agent in parts by weight: water = 1:50, pour the foaming agent and water into the foaming machine to foam, and let it stand for 5-8 minutes to obtain foam. Add the foam into the slurry, and then mix well, and the measured wet bulk density reaches 187kg / m 3 Stop adding foam at this time and pour the mold into the standard curing for 28 days, and keep the humidity above 95% before demoulding.

[0036] Detect that the apparent density of ultra-low apparent density cement-based materials is 120kg / m 3 , its compressive strength can reach 0.06MPa, its flexural strength is 0.01MPa, and its thermal conductivity is 0.061W / (m·K).

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Abstract

The invention relates to an ultralow apparent density anti-cracking cement-based material and a preparation method thereof. The preparation method comprises steps of firstly weighting cement, organic fiber, plant fiber, an early strength agent, a coagulant, a water reducer and water according to parts by weight of 500:(0-3):(0-3):(1-14):(45-70):(1-1.5):(150-325); then stirring so as to obtain slurry; uniformly mixing a foaming agent with water according to proportion of 1:(30-80), foaming, mixing with the slurry, molding through pouring, and standardly curing for 28 days. According to detection, the apparent density of the ultralow apparent density anti-cracking cement-based material is 80kg/m<3>-150kg/m<3>, the compression strength is 0.01MPa-0.161MPa, the breaking strength is 0.01MPa-0.072MPa, the heat conductivity coefficient thereof is 0.0403W/(m.K)-0.061W/(m.K), and the shrinkage crack resistance of the material with fiber in plasticity and hardening periods are respectively improved by 83.93%-99.81% and 49.69%-97.39% compared with that of the material without fiber. The fiber used in the material obviously inhibits shrinkage crack of the foam concrete, the material has low cost, has a simple formula, has long time for stabilizing foams, has low heat conductivity coefficient, is applicable to external wall insulation and roof insulation and is applicable to manufacturing non-bearing walls.

Description

technical field [0001] The invention discloses a cement-based material with ultra-low apparent density and anti-cracking and its preparation method. Specifically, it prepares a light-weight polystyrene board that can replace flammable materials, and can be used for external wall insulation, roof insulation, and non-load-bearing walls. body, and can solve the problems of easy cracking and difficult repair of cement-based materials. The apparent density is 80kg / m 3 ~150kg / m 3 A method for a lightweight cement-based material belongs to the technical field of building materials. technical background [0002] Cement-based materials are the most widely used man-made building materials in structural engineering. Lightweight cement-based materials are generally used for interior wall materials and other non-load-bearing structures of high-rise buildings. They mainly play the role of thermal insulation, so there is no excessive requirement for the strength of lightweight cement-bas...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/02C04B16/02C04B16/06
Inventor 马一平刘静静郭建平杨晓杰郭玉刚范建熙
Owner TONGJI UNIV
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