Steel slag sulphoaluminate-based expanding type base layer stabilization special cement and preparation method thereof

A technology of steel slag sulfoaluminate and sulfoaluminate cement, applied in cement production and other directions, can solve problems such as insufficient compensation for the volume shrinkage of the base layer, and achieve the effects of enhancing bonding force, reducing quantity and increasing construction efficiency

Active Publication Date: 2017-07-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in view of the small amount of cement used in the cement-stabilized base, the compensating shrinkage caused by micro-expansion cannot fully compensate the volume sh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] A special cement for stabilizing steel slag sulfoaluminate-based expansion type base course, and its preparation method includes the following steps:

[0035] 1) Weigh each component in proportion, each component and its weight parts are: 40 parts of steel slag, 30 parts of Portland cement clinker, 10 parts of sulfoaluminate cement clinker, 15 parts of gypsum;

[0036] 2) Grind the weighed steel slag separately and perform iron removal treatment to control the 0.08mm sieve (after iron removal) is not more than 30%, mix Portland cement clinker, sulfoaluminate cement clinker, and gypsum Grind uniformly, then add the steel slag after grinding and iron removal treatment to obtain the mixture, and continue to grind until the specific surface area of ​​the mixture is ≥300m 2 / kg, that is, the steel slag sulfoaluminate-based inflatable base stabilized special cement.

[0037] The strength grade of the steel slag sulfoaluminate-based inflatable base stabilized specia...

Example Embodiment

[0038] Example 2

[0039] A special cement for stabilizing steel slag sulfoaluminate-based expansion type base course, and its preparation method includes the following steps:

[0040] 1) Weigh each component in proportion, each component and its parts by weight: 30 parts of steel slag, 40 parts of Portland cement clinker, 15 parts of sulfoaluminate cement clinker, and 10 parts of gypsum;

[0041] 2) Grind the weighed steel slag separately and perform iron removal treatment to control the 0.08mm sieve (after iron removal) is not more than 30%, mix Portland cement clinker, sulfoaluminate cement clinker, and gypsum Grind uniformly, then add the steel slag after grinding and iron removal to obtain the mixture. Then use the liquid metering pump to add 0.5% of the total mass of each component from the grinding head. The retarder is continued to grind to the ratio of the mixture Surface area ≥300m 2 / kg, that is, the steel slag sulfoaluminate-based inflatable base stabilized special cemen...

Example Embodiment

[0043] Example 3

[0044] A special cement for stabilizing steel slag sulfoaluminate-based expansion type base course, and its preparation method includes the following steps:

[0045] 1) Weigh each component in proportion, each component and its weight parts are: 20 parts of steel slag, 60 parts of Portland cement clinker, 10 parts of sulfoaluminate cement clinker, and 10 parts of gypsum;

[0046] 2) Grind the weighed steel slag separately and perform iron removal treatment to control the 0.08mm sieve (after iron removal) is not more than 30%, mix Portland cement clinker, sulfoaluminate cement clinker, and gypsum Grind uniformly, then add the steel slag after grinding and iron removal to obtain the mixture. Then use the liquid metering pump to add 0.1% of the total mass of each component from the grinding head and continue to grind to the ratio of the mixture Surface area ≥300m 2 / kg, that is, the steel slag sulfoaluminate-based inflatable base stabilized special cement.

[0047] Th...

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Abstract

The invention discloses steel slag sulphoaluminate-based expanding type base layer stabilization special cement, which is prepared from the following ingredients in parts by weight: 10 to 45 parts of steel slag, 20 to 60 parts of portland cement clinker, 10 to 25 parts of sulphoaluminate cement clinker and 3 to 15 parts of gypsum. The portland cement clinker and the sulphoaluminate cement clinker are used in a compound way; solid wastes such as the steel slag and the gypsum are effectively used; the initial setting time of the cement material is greater than or equal to 6h; the final setting time is smaller than or equal to 10h; the 7-day linear expansivity is greater than or equal to 0.15 percent; the 28-day free expansivity is smaller than or equal to 1.0 percent; after popularization and application, the important significance is realized for promoting the comprehensive utilization of the steel slag and improving the anti-cracking performance and the strength of a pavement base layer; meanwhile, the cement production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a steel slag sulphoaluminate-based expansion type base-stabilizing special cement and a preparation method thereof. Background technique [0002] Semi-rigid pavement base materials are the mainstream form of pavement bases in my country, accounting for more than 90% of pavement bases in my country, of which cement stabilized bases account for the vast majority. Cement-stabilized base material needs enough time from water mixing to rolling completion, but often due to the long construction process and high temperature, when general-purpose cement is used to stabilize the pavement base, it often causes significant strength loss due to too fast condensation; in addition, general-purpose cement stabilizes The base layer is prone to dense cracks. The shrinkage and cracking of the cement-stabilized base can easily lead to reflective cracks in the pavement surface layer, a...

Claims

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Application Information

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IPC IPC(8): C04B7/147C04B7/38C04B7/52
CPCC04B7/147C04B7/38C04B7/52Y02P40/10
Inventor 沈卫国张昺榴朱文尚霍旭佳张宇星李将伟李剑超黄嘉琪刘安琪
Owner WUHAN UNIV OF TECH
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