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Method for preparing masonry mortar by using construction wastes

A technology for masonry mortar and construction waste, applied in the field of building materials, can solve the problems of high production cost, falling off, low dosage, etc., and achieve the effect of reducing production cost and improving strength

Inactive Publication Date: 2013-06-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, masonry mortar often falls off due to the high water absorption rate of the matrix and poor matching effect with the matrix strength.
In the production of masonry mortar, the production cost is often high because the amount of cement added is too high. In terms of the use of industrial waste residue, the activity of industrial waste residue is low, which leads to its low dosage or the performance of masonry mortar cannot reach the national standard. related standards

Method used

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  • Method for preparing masonry mortar by using construction wastes
  • Method for preparing masonry mortar by using construction wastes
  • Method for preparing masonry mortar by using construction wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of construction waste micropowder: After crushing, screening, and secondary crushing of waste concrete, the separation of aggregate and mortar can be realized. The particle size of mortar powder is ≤5mm, and it is ground in a ball mill until the specific surface area is 3000cm 2 / g; After crushing and grinding the waste sintered bricks, the specific surface area is 3000cm 2 / g, the separated mortar powder and waste fired brick powder are mixed evenly with a mixer at a mass ratio of 3:1. The chemical composition is shown in Table 1.

[0038] 2. Preparation of mineral admixture: Grind lead-zinc tailings and fly ash in a ball mill to a specific surface area of ​​3000-4000cm 2 / g, mixed evenly at a mass ratio of 1:1. The chemical composition is shown in Table 2. Among them, the radioactivity of lead-zinc tailings and fly ash is in line with the relevant requirements of "Limits of Radionuclide in Building Materials" (GB6566-2001).

[0039] 3. Preparation o...

Embodiment 2

[0043] 1. Preparation of raw materials: Grind the mortar powder separated from the waste concrete and the waste fired brick powder separately until the specific surface area is 3500cm 2 / g, according to the mass ratio of 4:1, use a mixer to mix evenly; grind the lead-zinc tailings and fly ash in a ball mill respectively until the specific surface area is 3500cm 2 / g, mixed evenly at a mass ratio of 2:1; the CaSO 4 and Na 2 SiO 3 9H 2 O was mixed evenly in a mass ratio of 1:3.

[0044] 2. According to the percentage by weight of each raw material: 18% of cement, 32% of construction waste powder, 40% of sand, 6% of mineral admixture, 3.5% of activator, 0.5% of water retention agent, select raw materials, mix each raw material evenly, Gotta build mortar.

Embodiment 3

[0046] 1. Preparation of raw materials: Grind the mortar powder separated from the waste concrete and the waste fired brick powder separately until the specific surface area is 4000cm 2 / g, according to the mass ratio of 3:1, use a mixer to mix evenly; grind the lead-zinc tailings and fly ash in a ball mill respectively until the specific surface area is 4000cm 2 / g, mixed uniformly at a mass ratio of 1:1; the CaSO 4 and Na 2 SiO 3 9H 2 O was mixed evenly in a mass ratio of 1:2.

[0047] 2. According to the percentage by weight of each raw material: 20% of cement, 35% of construction waste powder, 32% of sand, 8% of mineral admixture, 4.6% of activator, 0.4% of water retention agent, select raw materials, mix each raw material evenly, You have to build mortar.

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Abstract

The invention relates to a masonry mortar prepared by using construction wastes. The masonry mortar is mainly prepared from the following raw materials in percentage by mass: 15 to 25 percent of cement, 25 to 35 percent of construction waste micro-powder, 40 to 50 percent of sand, 5 to 10 percent of mineral admixture and 3 to 7 percent of exciting agent. A method for preparing the masonry mortar comprises the steps of preparing the construction waste micro-powder, preparing the exciting agent, preparing the mineral admixture and preparing the masonry mortar. The masonry mortar is of great significance for efficiently utilizing the construction wastes, reducing pollutions caused by solid wastes to the environment and reducing the production cost, and simultaneously the masonry mortar has the advantage of low cost and high strength.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing masonry mortar from construction waste. Background technique [0002] Masonry mortar is a widely used dry-mixed mortar. It is uniformly mixed with cementitious materials, fine aggregates, mineral admixtures, and chemical additives. It has stable quality, convenient construction, utilization of waste materials, and environmental protection. superiority. At present, dry-mixed mortar in my country is only used in a few large cities, and it is limited to a small amount of special mortar, and there are fewer ordinary dry-mixed mortars, masonry mortars and thermal insulation mortars. At the same time, the masonry mortar often falls off due to the high water absorption rate of the matrix and poor matching effect with the matrix strength. In the production of masonry mortar, the production cost is often high because the amount of cement mixed in is t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/16C04B22/00C04B24/38
CPCC04B2111/00646C04B2111/00017C04B28/02Y02W30/91C04B14/045C04B14/06C04B14/361C04B18/08C04B18/12C04B18/16C04B22/143C04B40/0028C04B2103/46C04B24/383
Inventor 马保国苏雷蹇守卫宋雪峰徐如林高立
Owner WUHAN UNIV OF TECH