Ultrafine mixed sand concrete by using additive

A technology for mixing sand and concrete, applied in the field of building materials, can solve the problems of intensifying the exploitation and use of rare resources such as natural medium sand, increasing the drying shrinkage of concrete, and low application scope, achieving significant social and environmental benefits, The effect of small slump loss and satisfactory mechanical properties

Active Publication Date: 2011-11-16
SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's ultra-fine sand (silt sand) is widely distributed, with a large output in natural rivers, abundant resources, convenient mining and transportation, and low prices. However, due to the increase in unilateral water consumption and cement consumption, the drying shrinkage of concrete increases. Na

Method used

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  • Ultrafine mixed sand concrete by using additive
  • Ultrafine mixed sand concrete by using additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mixing ratio (extra fine sand:crumbs) tight porosity 3：7 28% 4：6 38% 5：5 32% 6：4 35%

[0029] It can be seen from the comparison of the above lists that when the fineness modulus of the ultra-fine sand is 0.8, the compounding ratio of ultra-fine sand and debris is the most ideal of 4:6.

Embodiment 2

[0031] Mixing ratio (extra fine sand:crumbs) tight porosity 3：7 33% 4：6 33% 5：5 33% 6：4 36%

[0032] It can be seen from the comparison of the above list that when the fineness modulus of the ultra-fine sand is 1.0, the compounding ratio of ultra-fine sand and debris is the most ideal of 3:7.

Embodiment 3

[0034] Mixing ratio (extra fine sand:crumbs) tight porosity 3：7 30% 4：6 31% 5：5 32% 6：4 31%

[0035] It can be seen from the comparison of the above lists that when the fineness modulus of the ultra-fine sand is 1.2, the compounding ratio of ultra-fine sand and debris is the most ideal of 3:7.

[0036] Through the above experiments, we made the ratio of modified polycarboxylate water reducer to concrete for practical application:

[0037]

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Abstract

The invention relates to an ultrafine mixed sand concrete by using an additive, the concrete comprises cement, slag powder, fly ash, mixed sand, broken stone and the additive, the mixed sand comprises ultrafine mixed sand with fineness modulus of 0.8 - 1.2, medium sand with fineness modulus of 2.3 - 3.0, chips with fineness modulus of 2.8 - 3.6, and the stone flour content in chips is 4% - 8%, methylene blue is less than 1.4. According to the invention, the ultrafine mixed sand concrete solves the problems that the concrete prepared by chips is solid but unaesthetic, the ultrafine sand can not be used for the important projects and the slump loss of the ultrafine mixed sand concrete is large.

Description

technical field [0001] The invention relates to building materials, in particular to a superfine mixed sand concrete using admixtures. Background technique [0002] The continuous development of the economy has driven the rapid development of the construction industry, and concrete is one of the most used building materials in modern construction projects, and its demand in various buildings has increased by leaps and bounds. According to preliminary statistics, the total sales of commercial concrete in my country in 2009 reached about 790 million cubic meters. Faced with such a high sales volume of concrete, the supply of various raw materials for concrete is getting tighter and tighter. Sand is one of the most important raw materials for concrete. During the peak period of engineering construction, the demand for construction sand is huge. Due to the excessive exploitation of natural river sand year after year, river sand resources are becoming increasingly depleted,...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/30
CPCY02W30/91
Inventor 陈建大吴德龙吴慧华江靖冯波卞成辉焦贺军陈尧亮
Owner SHANGHAI CONSTR BUILDING MATERIALS TECH GRP CO LTD
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