Straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block and preparation method thereof

A technology of magnesium oxychloride cement and hollow slabs, applied in cement mixing devices, clay preparation devices, chemical instruments and methods, etc., can solve problems such as poor water resistance, improve thermal insulation performance, reduce environmental burden, and be easy to purchase Effect

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

[0005] In order to solve the problem of poor water resistance existing in existing magnesium cement products, the invention provides a straw / ash magnesium oxychloride cement hollow strip or hollow block and a preparation method thereof, which have good water resistance and high strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A straw / ash magnesium cement hollow slab / hollow block and a preparation method thereof, the steps are as follows:

[0027] (1) halogen sheet is mixed with the magnesium chloride solution of mass fraction 25%-30%;

[0028] (2) Select ash and slag (such as fly ash, slag, silica fume any one or a mixture of any several) and modifier phosphate (including potassium dihydrogen phosphate, ammonium dihydrogen phosphate, sodium hydrogen phosphate , magnesium phosphate, etc.), boric acid or sodium borate modifier, etc.;

[0029] (3) According to MgO and MgCl 2 The mass ratio of 5:1-6:1 (according to MgCl 2 MgCl in solution 2 The ratio of the mass of magnesium oxide to the mass of magnesium oxide), the ash residue accounts for 10%-30% of the MgO mass, and the phosphate modifier accounts for 0.5%-2% of the MgO mass. MgO, MgCl 2 , ash and modifier are mixed uniformly to prepare magnesium oxychloride cement cementitious material;

[0030] (4) Straw fiber processed from rice stra...

Embodiment 1

[0032] Embodiment 1: select raw material, MgO and MgCl according to above-mentioned characteristic steps 2 The mass ratio is 5:1, the ash (fly ash) dosage is 10% (accounting for MgO mass percentage), the straw volume dosage is 10% (accounting for total volume percentage), modifier potassium dihydrogen phosphate The dosage is 1% (accounting for the percentage of MgO mass). According to the above steps, the magnesium oxychloride cement cementitious material is formulated and prepared, water is added and stirred, and molds are installed.

[0033] The molded specimens were placed under natural conditions and cured for 28 days to measure their strength and conduct a water resistance test. The results show that the 28d flexural strength of the specimen is above 10MPa, the 28d compressive strength is 50MPa, and the softening coefficient after soaking in water for 28d is above 0.81.

[0034] At the same time, in this example, the magnesium oxychloride cement cementitious material wi...

Embodiment 2

[0035] Embodiment 2: choose raw material, MgO and MgCl according to above-mentioned characteristic steps 2 The mass ratio is 5:1, the ash (fly ash) content is 10% (accounting for MgO mass percentage), the straw volume content is 30% (accounting for the total ratio volume percentage), modifier phosphoric acid di The dosing amount of potassium hydrogen is 1% (accounting for the percentage of MgO mass). According to the above steps, the magnesium oxychloride cement cementitious material is formulated and prepared, water is added and stirred, and molds are installed.

[0036] The molded specimens were preserved under natural conditions, and their bulk density, strength, water resistance and thermal conductivity were measured. The results show that the dry bulk density of the specimen is 1400kg / m 3 , the 28d flexural strength of the specimen is above 9MPa, the 28d compressive strength is above 14MPa, the thermal conductivity is 0.22w / (m·k), and the softening coefficient after soa...

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Abstract

The invention discloses a straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block and a preparation method thereof. The preparation method comprises the steps of: firstly, adding a modifying agent into an MgCl2 solution prepared by a normal bittern's slice to be stirred uniformly, wherein the mass ratio of MgO to MgCl2 is 5:1-6:1, the ash accounts for 10-30 percent by mass of the MgO and the modifying agent accounts for 0.5-2 percent of MgO; secondly, mixing and stirring with uniformly stirred MgO powder and ash to obtain a magnesium-oxy-chloride cement gelled material; thirdly, adding straw fibers into the magnesium-oxy-chloride cement gelled material according to the proportion that the straw fibers account for 10-40 percent of the total volume of the straw fibers and the magnesium-oxy-chloride cement gelled material, uniformly stirring by adding water until the fluidity of a mixture reaches 110-140 mm according to the straw water absorption, and die-filling, vibrating and molding or reducing the water to binder ratio and then pressurizing and molding to obtain the straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block after slurry shows better fluidity. The invention has good watertightness, high strength, good temperature and heat insulating effect, resource saving and environment load reduction.

Description

1. Technical field [0001] The invention mainly relates to a method for preparing building materials, in particular to a method for preparing straw / ash magnesium cement hollow slats / hollow blocks by using straw, ash, magnesium oxide and halogen chips as raw materials. 2. Background technology [0002] my country's agricultural production has a long history and a large scale, but the domestic utilization rate of these straws is still very low. Most rural areas have always used straws as living fuel and livestock feed. However, since the 1970s, with the increase in crop yields , The total amount of straw increased rapidly. According to research by Chen Hongzhang and others, the world produces 100 to 200 billion tons of crop straws every year, and our country reaches about 700 million tons every year. A large amount of crop straws are discarded and incinerated, and the phenomenon of open-air burning of straws is intensifying, which brings great impact on the ecological environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/32C04B18/24C04B18/08C04B18/12C04B18/10E04C1/00B28C7/04B28C5/00
CPCC04B2111/28C04B2111/27C04B28/32C04B2103/0012Y02W30/91C04B18/08C04B18/141C04B18/146C04B18/24C04B22/16C04B22/0013
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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