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Blast-furnace slag powder concrete applied for expressway

The technology of blast furnace slag powder and expressway is applied in the field of concrete, which can solve the problems of affecting the construction progress on site, affecting the time of concrete demolding, prestressed beam plate tensioning time, slow growth of concrete strength in the early stage, etc. Improved workability, workability and improved compressive strength

Inactive Publication Date: 2019-07-09
CCCC SHEC DONGMENG ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known from the test that the initial strength of the concrete increases slowly after the fly ash is added, which affects the time for removing the formwork of the concrete, the tensioning time of the prestressed beam and slab, and directly affects the construction progress of the site.

Method used

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  • Blast-furnace slag powder concrete applied for expressway
  • Blast-furnace slag powder concrete applied for expressway
  • Blast-furnace slag powder concrete applied for expressway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, the blast furnace slag powder concrete is composed of sand and gravel raw materials, cement, admixtures, and water reducing agents.

[0043] The admixture is blast furnace slag powder, and the mixing amount of the blast furnace slag powder is 15-40.0% of the total mass of the cement and the admixture. Among them, when configuring concrete with strength grade C30~C35, the reasonable mixing amount of blast furnace slag powder is 15%-40% of the total mass of cement and admixture; when configuring strength grade C40 concrete, the reasonable mixing amount of blast furnace slag powder 15%-35% of the total mass of cement and admixtures; when configuring strength grade C50 concrete, the reasonable dosage of blast furnace slag powder is 15%-30% of the total mass of cement and admixtures. When the compressive strength is 7d, there is a modulus of resilience value that can meet the tension. When high-grade cement is used, the reasonable mixing ratio of blast f...

Embodiment 2

[0048] In this embodiment, the blast furnace slag powder concrete is composed of sand and gravel raw materials, cement, admixtures formed of blast furnace slag powder and fly ash, and a water reducer.

[0049] Among them, when configuring concrete with strength grades C30-C40, the amount of fly ash added is constant at 15% of the total mass of cement and admixtures, and the amount of blast furnace slag powder added is 15%-35% of the total mass of cement and admixtures. %; when configuring concrete with strength grade C50, considering the requirement of stretching and grouting for about 7 days of prestressing, the mixing amount of fly ash is constant at 15% of the total mass of cement and admixtures, and the mixing amount of blast furnace slag powder The input amount is 15%-20% of the total mass of cement and admixtures. When high-grade cement is used, the reasonable mixing ratio of blast furnace slag powder in the admixture can be increased, and at the same time, the chloride ...

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Abstract

The invention provides blast-furnace slag powder concrete applied for an expressway. The blast-furnace slag powder concrete is composed of an aggregate raw material, cement, an admixture and a water reducer, wherein the admixture is blast-furnace slag powder or a mixture of the blast-furnace slag powder and coal ash. The blast-furnace slag powder is produced by adding gypsum and a grinding aid into blast furnace slag and conducting a superfine grinding technology on a mixture, and a specific surface area of the blast furnace slag powder is larger than or equal to 450 m<2> / kg. When the admixture is the mixture of the blast-furnace slag powder and the coal ash, the dosage of the coal ash is 15.0% of the total mass of the cement and the admixture. By applying the blast-furnace slag powder concrete, the flowability of the concrete can be effectively improved, the total alkali content of the concrete is reduced, the durability of the concrete is improved, and the cost of the concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a blast furnace slag powder concrete applied to highways. Background technique [0002] Concrete is an indispensable component for the development of modern infrastructure industry, and the requirements for concrete performance have been updated day by day. High performance concrete has become a trend. Concrete with different properties can change its working performance to meet specific environmental requirements without affecting its strength. Concrete is made by using cement as the cementitious material, sand and stone as aggregates, which can be mixed with water and admixtures in a certain proportion and stirred, and is widely used in civil engineering. However, road construction is mostly carried out in the field, and the natural conditions in remote areas are poor, transportation is inconvenient, and the supply of equipment and raw materials and the adjustment of constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/14
CPCC04B28/04C04B2111/0075C04B18/12C04B18/141C04B22/143C04B2103/52C04B2103/302C04B18/08Y02W30/91
Inventor 马保亮
Owner CCCC SHEC DONGMENG ENG CO LTD