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Composite admixture with coal ash and slag powder and high-strength concrete made of same

A composite admixture and fly ash technology, applied in the field of high-strength concrete, can solve problems such as high cost, high energy consumption in production, and limited resources, and achieve the effects of fine particle size, improved strength in the later stage, and large specific surface area

Inactive Publication Date: 2018-10-30
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the concrete admixtures use silica fume, etc. Such admixtures have limited resources, high cost, and large production energy consumption.

Method used

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  • Composite admixture with coal ash and slag powder and high-strength concrete made of same
  • Composite admixture with coal ash and slag powder and high-strength concrete made of same
  • Composite admixture with coal ash and slag powder and high-strength concrete made of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of composite admixture: the specific surface area is 500-800 m after mixing and grinding the secondary fly ash and S95 grade slag at a mass ratio of 7:3 2 / kg of admixture, denoted as CF.

[0023] The admixture prepared above is used to prepare concrete, and the admixture that is 43% of the quality of the cementitious material is used to replace cement; cement is P O42.5R ordinary silicate produced by Guangdong Yingde Conch Cement Co., Ltd. Cement; fine aggregate is Beijianghe sand from Xindu Sand and Stone Plant, Tanbu Town, Huadu District, fineness modulus Mx=2.84, and mud content 0.9%; coarse aggregate is 5-10mm melonite and Daya Bay produced in Zengcheng Stone Field The two-stage coarse aggregate of 5-20mm gravel produced in the quarry is combined into 5-20mm continuous graded aggregate; the water reducing agent is Kejie KJ-JS polycarboxylate high-performance water reducing agent.

[0024] The mix ratio of this concrete is shown in Table 1, which is com...

Embodiment 2

[0031] Preparation of admixture: Mix and grind the secondary fly ash and S95 slag at a mass ratio of 6:4 to obtain a specific surface area of ​​500-800 m 2 / kg of admixture, denoted as CF.

[0032] The admixture prepared above is used to prepare concrete, and the admixture that is 43% of the quality of the cementitious material is used to replace cement; cement is P O42.5R ordinary silicate produced by Guangdong Yingde Conch Cement Co., Ltd. Cement; fine aggregate is Beijianghe sand from Xindu Sandstone Factory, Tanbu Town, Huadu District, fineness modulus Mx=2.84, mud content 0.9%; coarse aggregate is 5-10mm melonite and Daya Bay from Zengcheng Stone Field The two-stage coarse aggregate of 5-20mm gravel produced in the quarry is combined into 5-20mm continuous graded aggregate; the water reducing agent is Kejie KJ-JS polycarboxylate high-performance water reducing agent.

[0033] The mix ratio of this concrete is shown in Table 3, which is compared with pure cement concrete,...

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Abstract

The invention discloses a composite admixture with coal ash and slag powder and high-strength concrete made of same. The composite admixture comprises coal ash and slag powder in a mass ratio of (6-8):(2-4). The slag powder and the coal ash are adopted as the admixture which is applied to concrete, synergetic effects of strength activity and working capabilities of the two components can be sufficiently brought into play, the slump degree and the expansion degree of the composite admixture are remarkably prior to those of standard concrete, and pumping construction can be facilitated. In addition, the coal ash and the slag powder of which the specific surface areas are within 400-800m<2> / kg are adopted as the composite admixture, the composite admixture has a large specific surface area and a small particle size and can be used with cement to form a reasonable micro-graded model, better granular grading can be provided for concrete, the concrete can be at an ideal dense state, and thelater strength of a cementing material can be well improved.

Description

technical field [0001] The invention belongs to the field of building materials, and more specifically relates to a composite admixture containing fly ash and slag powder and high-strength concrete prepared by using the composite admixture. Background technique [0002] In recent years, my country's construction industry has developed rapidly, and the level of construction has improved unprecedentedly, which is mainly reflected in the skyscrapers and super long-span bridges with a huge amount of engineering. This puts higher requirements on the foundation of buildings. The foundations of these skyscrapers and super-long-span bridges with huge engineering volumes are all large-scale reinforced concrete structures. These structures must not only consider the compressive strength of concrete, but also the Tensile strength, in order to prevent the generation of cracks, to meet the needs of durability. It is generally necessary to add admixtures to improve the tensile strength o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B18/08C04B28/04
CPCC04B28/04C04B40/0042C04B2201/50C04B18/141C04B18/08C04B14/068C04B14/02C04B2103/302C04B22/002Y02W30/91
Inventor 欧阳东张浩
Owner JINAN UNIVERSITY
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