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Alkali slag foamed concrete

A technology of foamed concrete and foamed concrete, which is applied in the field of foamed concrete and alkali slag foamed concrete, can solve the problems of long setting time, low compressive strength, and slow strength development, and achieve short setting speed, excellent weather resistance, and strength development fast effect

Inactive Publication Date: 2014-12-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has led to the common existence of long setting time, slow strength development, long formwork removal time and low compressive strength in existing foam concrete (bulk density is 800kg / m 3 ~850kg / m 3 Foamed concrete with a compressive strength of less than 2MPa and a density of less than 400kg / m 3 When the strength is less than 0.5MPa)
For this reason, someone used magnesium cementitious material to prepare a density of 380kg / m 3 , foam concrete with a strength of 1.0MPa, but the magnesium cement has poor water resistance, and it is easy to decompose during long-term use, resulting in a decrease in strength, and there are defects such as blooming and back halogen

Method used

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  • Alkali slag foamed concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The method that present embodiment prepares alkali slag foamed concrete comprises the following steps:

[0082] 1), select raw materials according to the proportion, the selected raw materials in this embodiment are: slag: 63-65 parts; NaOH: 5-6 parts; water: 25-26 parts; foaming agent: 4.8-5.2 parts;

[0083] 2), mixing step 1) selected slag and alkali activator and add water and stir;

[0084] 3), add water to the foaming agent selected in step 1) and perform foaming treatment;

[0085] 4), the foam obtained in step 3) is added to the alkali slag slurry obtained in step 2), and the two are stirred until uniformly mixed;

[0086] 5), pouring and curing alkali slag foam concrete.

[0087] In this example:

[0088] The slag is water-quenched blast furnace slag, and its specific surface area is 440-460m 2 / kg, the density is 2.85-2.95g / cm 3 , Alkalinity coefficient M 0 =0.95~1.05, activity coefficient M a =0.42~0.48, quality factor M k =1.65~1.85;

[0089] The sl...

Embodiment 2

[0091] The method that present embodiment prepares alkali slag foamed concrete comprises the following steps:

[0092] 1), select raw material according to proportioning, the selected raw material of this embodiment is: slag: 60~61 parts; Water glass: 10~11 parts; Water: 24~25 parts; Foaming agent: 5.0~5.4 parts;

[0093] 2), mixing step 1) selected slag and alkali activator and add water and stir;

[0094] 3), add water to the foaming agent selected in step 1) and perform foaming treatment;

[0095] 4), the foam obtained in step 3) is added to the alkali slag slurry obtained in step 2), and the two are stirred until uniformly mixed;

[0096] 5), pouring and curing alkali slag foam concrete.

[0097] In this example:

[0098] The slag is water-quenched blast furnace slag, and its specific surface area is 440-460m 2 / kg, the density is 2.85-2.95g / cm 3 , Alkalinity coefficient M 0 =0.95~1.05, activity coefficient M a =0.42~0.48, quality factor M k =1.65~1.85;

[0099] T...

Embodiment 3

[0104] The difference between this example and Example 1 is that the raw materials selected in this example are: slag: 62-63 parts; NaOH: 5-6 parts; water: 25-26 parts; foaming agent: 6.3-6.7 parts.

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Abstract

The invention discloses an alkali slag foamed concrete which comprises slag and an alkali activator, wherein the alkali activator is sodium hydroxide or water glass. When the alkali activator is sodium hydroxide, the alkali slag foamed concrete is composed of the following components in parts by mass: 59-65 parts of slag, 5-6% of NaOH, 23-26 parts of water and 4.8-12.2 parts of foaming agent. When the alkali activator is water glass, the alkali slag foamed concrete is composed of the following components in parts by mass: 56-61 parts of slag, 9-11 parts of water glass, 21-25 parts of water and 5.0-12.2 parts of foaming agent. The volume weight of the foamed concrete is 290-610 kg / m<3>. The alkali slag foamed concrete has the advantages of short setting time, quick strength development, higher later strength, excellent water resistance and excellent weather resistance, and can be used for a long time.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to foam concrete, in particular to alkali slag foam concrete. Background technique [0002] Foam concrete is a microporous lightweight thermal insulation material formed by using a foaming agent to produce foam through machinery, and then adding the foam to the cementitious material slurry to make a foam slurry, and then forming or cast-in-place, through natural curing and steam curing. . In recent years, the extensive implementation of the national energy-saving policy has accelerated the development of the foam concrete industry, and its annual output and application fields have gradually increased. [0003] At present, the cementitious materials of foam concrete at home and abroad are mainly ordinary Portland cement, sulphoaluminate cement, iron-aluminate cement, and pozzolanic composite cementitious materials. This has led to the common existence of long setting time, slow stre...

Claims

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Application Information

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IPC IPC(8): C04B28/08C04B38/02
Inventor 杨长辉王磊杨凯晏维江江星陈科傅博
Owner CHONGQING UNIV
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