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Cast-in-situ straw/ash magnesium oxychloride cement wall and construction method

A magnesium oxychloride cement, construction method technology, applied in the direction of walls, solid waste management, building components, etc., can solve the problems of poor water resistance, etc., achieve the effect of improving thermal insulation performance, excellent flame retardancy, and reducing environmental burden

Inactive Publication Date: 2010-09-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor water resistance of existing magnesium cement products, the invention provides a cast-in-place straw / ash magnesium oxychloride cement wall and a construction method. The obtained cast-in-place cement wall has good water resistance, low cost, and high strength. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: select raw material according to above-mentioned characteristic step, light burning MgO dosage is 55.8%, the mass percentage concentration is the MgCl of 25% 2 The dosage of solution is 35.23%, the dosage of ash (fly ash) is 5.58 percent, the dosage of straw is 2.83 percent, and the dosage of modifier potassium dihydrogen phosphate is 0.56 percent. According to the above characteristic steps, the preparation and preparation of the straw ash magnesium oxychloride cement cementitious material are carried out, and water is added and stirred according to the water absorption rate of the straw (the fluidity is controlled to 110-140mm), and the wall is cast in place and formed at one time.

[0029] The dry bulk density of the wall is 1780kg / m 3 , 56d flexural strength of 10-16MPa, 56d compressive strength of 40-60MPa, thermal conductivity of 0.3w / (m·k).

Embodiment 2

[0030] Embodiment 2: select raw material according to above-mentioned characteristic steps, MgO dosage is 54.88%, MgCl 2 The dosage of the solution is 32.96%, the dosage of ash (slag) is 5.48 percent, the dosage of straw is 6.14 percent, and the dosage of modifier ammonium dihydrogen phosphate is 0.54 percent. According to the above characteristic steps, the preparation and preparation of the straw ash magnesium oxychloride cement cementitious material is carried out, and water is added and stirred according to the water absorption rate of the straw (to control fluidity), and the wall is cast in place and formed at one time.

[0031] The dry bulk density of the wall is 1680kg / m 3 , The flexural strength of 56d reaches 8-11MPa, the compressive strength of 56d reaches 20-35MPa, and the thermal conductivity is 0.28w / (m·k).

Embodiment 3

[0032] Embodiment 3: select raw material according to above-mentioned characteristic steps, MgO dosage is 52.57%, the MgCl of 30%wt 2 The dosage of solution is 31.57%, the dosage of ash (silicon fume) is 5.26%, the dosage of straw is 10.08%, and the dosage of modifying agent sodium dihydrogen phosphate is 0.52%. According to the above characteristic steps, the preparation and preparation of the straw ash magnesium oxychloride cement cementitious material is carried out, and water is added and stirred according to the water absorption rate of the straw (to control fluidity), and the wall is cast in place and formed at one time.

[0033] The dry bulk density of the wall is 1300kg / m 3 , 56d flexural strength of 7-10MPa, 56d compressive strength of 13-20MPa, thermal conductivity of 0.21w / (m·k).

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Abstract

The invention discloses a cast-in-situ straw / ash magnesium oxychloride cement wall and a construction method. The straw / ash magnesium oxychloride cement wall is obtained by processing straw, ash, light burned magnesia, magnesium chloride and the like and performing in-situ casting under the action of a modifier. The straw / ash magnesium oxychloride cement wall comprises the following raw materials in percentage by mass: 45 and 60 percent of magnesium oxide, 25 to 40 percent of solution of magnesium chloride, 2 to 20 percent of straw, 5 to 15 percent of ash and 0.5 to 2 percent of modifier. When the wall is cast in situ, the magnesium oxide, the solution of magnesium chloride, the straw, the ash and the modifier are mixed and stirred, and water is added into the mixture according to the water absorption of the straw to perform one-time forming through in-situ casting after the mixture is stirred uniformly. The wall is characterized in that the doping volume of the straw can be changed according to design requirements, and the straw can be used as inner and outer partition plates; the binding power is strong, so the adhesion process of the cast-in-situ wall materials and the conventional wall materials is avoided; due to the addition of the straw, the volume weight of products is reduced and the heat-insulating and heat-shielding performance of the products is improved; and a large amount of waste material ash, straw and the like is utilized to relieve the environmental burden effectively and reduce the cost, so the wall has great economic and social benefits.

Description

1. Technical field [0001] The invention relates to a new type of building material, and mainly relates to a cast-in-place straw magnesium oxychloride cement wall material and a construction method prepared by using crop straw, ash, magnesium oxide and halogen flakes as raw materials. 2. Background technology [0002] With the development of the construction industry, the demand for building materials is increasing, but for many years, there have always been serious drawbacks in the production of traditional building materials, such as traditional wall materials that are mainly sintered clay, not only the raw materials consume a lot of soil and mineral resources, and cause waste of resources and damage to the natural environment. From the perspective of sustainable development, the future building materials industry must break through the disadvantage of high energy consumption. For this reason, as early as the 1940s and 1950s, developed countries began to transform the wall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B2/84C04B28/32
CPCC04B2111/28C04B28/32Y02W30/91C04B7/00C04B18/24C04B40/0028
Inventor 陈惠苏张政涛孙伟秦鸿根赵国堂李化建
Owner SOUTHEAST UNIV
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