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Energy-saving and waste-utilizing concrete block or board and production method thereof

A technology for waste blocks and plates, applied in the field of building materials, can solve the problems of low strength, long demoulding time, large capital investment, etc., and achieve the effects of excellent thermal insulation performance, good economic benefits, and good fire resistance.

Inactive Publication Date: 2012-09-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfur dioxide emissions seriously pollute the atmosphere and lead to the expansion of acid rain areas
However, the use of this process will produce desulfurized gypsum, an industrial by-product. my country produces about 15 million tons of desulfurized gypsum per year. It is estimated that by 2020, my country's desulfurized gypsum emissions will reach 90 million tons. land resources, and pollute the surrounding ecological environment, how to consume a large amount of desulfurization gypsum has become an urgent problem to be solved
[0003] The composition of desulfurized gypsum is the same as that of natural gypsum, which is calcium sulfate dihydrate (CaSO 4 2H 2 O), which is used directly without calcination, has poor gelling properties, and poor water resistance after hardening
One of the main applications of desulfurized gypsum at present is to produce building materials such as plaster gypsum, gypsum blocks and gypsum boards after being calcined. 2) The strength of the prepared gypsum blocks and boards and other building materials is low, and the water resistance is still poor; 3) The utilization area is narrow, and a large amount of desulfurized gypsum cannot be absorbed
[0005] The curing methods of foam concrete can adopt natural curing, steam curing and autoclaving curing. At present, the production of foam concrete blocks and plates is mainly based on natural curing, but the demoulding time of this curing method is longer
Autoclave maintenance requires large equipment such as autoclaves, and the capital investment is relatively large

Method used

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  • Energy-saving and waste-utilizing concrete block or board and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1, an energy-saving and waste-recycling block and plate, according to desulfurization gypsum 100, S95 slag powder 80, superfine fly ash 100, cement 30, foaming agent 0.2, alkaline activator 2, early strength agent 0.5, Water reducer 0.02, mineral fiber 0.35, triethanolamine 0.02 weight ratio prepared. Wherein the foaming agent is dissolved in water equivalent to 150 times its weight. The water consumption for preparing slurry is 45% of the total weight of desulfurized gypsum, slag powder, superfine fly ash and cement. The steam curing system adopted is a static stop temperature of 15°C, a static stop time of 2h, a heating rate of 5°C / h, a constant temperature of 50°C, a constant temperature time of 5h, a cooling rate of 20°C / h, and a cooling target temperature of 15°C. The properties of this energy-saving and waste-recycling block and plate are shown in Table 1 and Table 2, respectively.

Embodiment 2

[0054] Example 2, an energy-saving and waste-recycling block and plate, according to desulfurization gypsum 100, S75 slag powder 90, superfine fly ash 20, cement 55, foaming agent 0.5, alkaline activator 6, early strength agent 4, Water reducer 0.75, mineral fiber 3.50, triethanolamine 0.010 weight ratio prepared. Wherein the foaming agent is dissolved in water equivalent to 150 times its weight. The water consumption for preparing slurry is 50% of the total weight of desulfurized gypsum, slag powder, superfine fly ash and cement. The steam curing system adopted is a static stop temperature of 20 °C, a static stop time of 4 h, a heating rate of 10 °C / h, a constant temperature of 60 °C, a constant temperature time of 8 h, a cooling rate of 25 °C / h, and a cooling target temperature of 20 °C. The properties of this energy-saving and waste-recycling block and plate are shown in Table 1 and Table 2, respectively.

Embodiment 3

[0055] Example 3, an energy-saving and waste-recycling building block and board, according to desulfurization gypsum 100, S75 slag powder 110, superfine fly ash 80, cement 50, foaming agent 0.7, alkaline activator 8, early strength agent 5, Water reducer 0.90, mineral fiber, 1.50, triethanolamine 0.08 weight ratio prepared. Wherein the foaming agent is dissolved in water equivalent to 150 times its weight. The water consumption for preparing the slurry is 55% of the total weight of desulfurized gypsum, slag powder, superfine fly ash and cement. The steam curing system adopted is 25°C static stop temperature, 6h static stop time, 10°C / h heating rate, 65°C constant temperature, 10h constant temperature time, 35°C / h cooling rate, and 20°C cooling target temperature. The properties of this energy-saving and waste-recycling block and plate are shown in Table 1 and Table 2, respectively.

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to an energy-saving and waste-utilizing concrete block or board and a production method thereof. The energy-saving and waste-utilizing concrete block or board is composed of desulfurization gypsum, slag powder, ultrafine fly ash, cement, foaming agent, alkaline excitant, early strength agent, water reducer, mineral fiber and triethanolamine. The desulfurization gypsum is cold-dried. By the energy-saving and waste-utilizing concrete block or board, industrial waste such as the desulfurization and the slag powder can be consumed in a large amount and turned into treasure, and environmental pressure caused by stacking of the waste can be relieved. In addition, steam conservation is adopted, strength development of concrete block and board is accelerated, and early strength is improved greatly, so that reuse of moulds can be quickened, conservation space is economized, and the energy-saving and waste-utilizing concrete block or board is suitable for industrial production. Foamed concrete block and board produced has fine performances of light weight, heat insulation, sound absorption, flame retardancy and the like. The energy-saving and waste-utilizing concrete block or board is applicable to projects such as roof insulation, wall insulation, road sound absorption and building sound insulation.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an energy-saving and waste-utilizing block or plate and a preparation method thereof. Background technique [0002] my country is a country that uses coal as its main energy source, and it is also the world's largest coal consumer. Moreover, the sulfur content of my country's coal is relatively high, resulting in 90% of my country's sulfur dioxide emissions to the atmosphere from coal combustion, of which about 50% comes from thermal power plants. Sulfur dioxide emissions seriously pollute the atmosphere and lead to the expansion of acid rain areas. In order to prevent sulfur dioxide gas from polluting the atmosphere, coal-fired power plants adopt wet limestone-gypsum flue gas desulfurization technology to minimize sulfur dioxide emissions. As of the end of 2010, the capacity of flue gas desulfurization units in my country's thermal power plants is about ...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B38/02C04B22/14C04B18/30C04B14/38
CPCY02W30/91
Inventor 孙振平刘警
Owner TONGJI UNIV
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