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Volume stabilizer of free calcium oxide as well as preparation and application thereof

A free calcium oxide and stabilizer technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve environmental pollution problems, achieve the effects of reducing pollution, reducing costs, and improving early strength

Inactive Publication Date: 2013-02-06
SHANGHAI RES INST OF BUILDING SCI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this kind of waste is mainly disposed of in landfill, which pollutes the environment.

Method used

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  • Volume stabilizer of free calcium oxide as well as preparation and application thereof
  • Volume stabilizer of free calcium oxide as well as preparation and application thereof
  • Volume stabilizer of free calcium oxide as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take silicon slag (produced by Shanghai Waigaoqiao Petrochemical Plant), and dry it in an oven at a temperature of 100±5°C for 24 hours. Get dried silicon slag 950g and 50g CaO (analytically pure), and dried silicon slag 1000g, respectively grind 20-80min in laboratory standard mill (Φ50×50cm) (Shanghai building material instrument factory production), obtain free Calcium oxide volume stabilizer, according to GB / T 1345-2005 "Cement fineness test method sieve analysis method", determine the sieve residue of 80μm, see Table 2.

[0029] Table 2

[0030]

Embodiment 2

[0032] For free calcium oxide volume stabilizers of different finenesses, use the internal blending method to mix with reference cement, and replace 10% cement with equal mass (that is, the weight ratio of free calcium oxide volume stabilizers in the cementitious material is 10%), water The gray ratio is 0.5, and the strength test is carried out according to "Cement mortar strength test method (ISO method)) GB / T17671-1999. For B2 to B8, see Table 3 for the experimental results.

[0033] table 3

[0034]

[0035] It can be seen from Table 3:

[0036] (1) When the 80 μm sieve residue of the free calcium oxide volume stabilizer is 1-3%, the 7-day and 28-day compressive strength can exceed the benchmark cement, indicating that the free calcium oxide volume stabilizer has higher activity.

[0037] (2) Comparing the experimental results of groups B7 and B8, adding CaO to modify the silicon slag can improve the strength to a certain extent.

Embodiment 3

[0039] Take silicon slag (produced by Shanghai Waigaoqiao Petrochemical Plant), and dry it in an oven at a temperature of 100±5°C for 24 hours.

[0040] Get dried silicon slag 880g and mix with 120g anhydrous sodium metasilicate (chemically pure); Grind 50min in the laboratory standard mill (Φ50 * 50cm) (Shanghai building materials instrument factory production), obtain free calcium oxide volume stabilizer ( numbered C2).

[0041] Get dried silica slag 900g and 100g cement (P.O42.5) and mix, grind 50min in laboratory standard mill (Φ50 * 50cm) (Shanghai building materials instrument factory production), obtain free calcium oxide volume stabilizer (number is C3).

[0042] Adopt internal blending method to mix reference cement, replace 10% cement with above-mentioned free calcium oxide volume stabilizer respectively equal quality (the weight ratio of free calcium oxide volume stabilizer in cementitious material is 10%), water-cement ratio is 0.5, according to the "cement morta...

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Abstract

The invention discloses a volume stabilizer of free calcium oxide, which comprises the following raw materials in parts by weight relative to total 100 parts by weight: 80-100 parts of silica slag, and 0-20 parts of alkaline modifying agent. The invention also discloses a preparation method and application of the volume stabilizer of the free calcium oxide, and the volume stabilizer can be used for preparing a hydraulic cementing material in which the weight ratio of the volume stabilizer is 2-20 percent. The invention can improve volume stabilization of industrial solid wastes with high content of the free calcium oxide, such as calcium ashes, steel slag, dry desulphurization ashes and the like, and enhance initial strength.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a hydraulic gelling material, in particular to a free calcium oxide volume stabilizer, which can be used as a modifier for industrial solid wastes with high content of free calcium oxide. Background technique [0002] With the development of concrete and cement technology, industrial solid wastes such as fly ash and steel slag have been widely used in concrete admixtures and cement mixtures. However, high-calcium ash, steel slag, and dry desulfurization ash all contain unstable chemical components—free calcium oxide, which brings great inconvenience to engineering applications. Taking high-calcium ash as an example, the actual rate of fly ash in Shanghai in 2001 was 97.6%, and the unused part was mainly high-calcium ash. It is estimated that around 2010, the annual discharge of high calcium ash in Shanghai will increase by 1.6 million tons. Compared with low-calcium ash, high-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06C04B22/08C04B28/02C01F11/02
Inventor 李阳
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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