High strength concrete adopting desulfurized gypsum as activator, and preparation method thereof

A technology of high-strength concrete and desulfurized gypsum, applied in the field of building materials, can solve the problems of unsatisfactory development of concrete strength, poor adaptability of water-reducing agent, depletion of high-quality river sand resources, etc., so as to reduce mining and environmental damage, improve The effect of impermeability and excellent performance

Inactive Publication Date: 2012-05-16
SHANGHAI URBAN CONSTR MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the two revisions of the cement standard have led to the continuous increase of the specific surface area of ​​the cement supplied in the market, the poor adaptability to the water reducer, and the unsatisfactory development of the strength of the prepared concrete in the later stage, coupled with the depletion of high-quality river sand resources. The preparation, actual production and application bring great technical difficulties. Therefore, the research on using local materials to prepare high-strength concrete with excellent mechanical propertie

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A high-strength concrete using desulfurized gypsum as an activator, in parts by weight, 42.5 grade Portland cement 100, grade I class C fly ash 30, S105 slag powder 70, activated coal gangue 0, metakaolin 35, desulfurization Gypsum 20, slaked lime 5.3, sucrose ester 0.0002, machine-made sand 400, andesite gravel 500, polycarboxylate superplasticizer 2.35, water 67.

[0041] Its preparation method concrete steps are as follows:

[0042] (1) Take raw materials by weight ratio, and dry mix cement, fly ash, slag powder, activated coal gangue, metakaolin, desulfurized gypsum, slaked lime, and sucrose ester to a uniform state in advance;

[0043] (2) Add polycarboxylate water reducer and water accounting for 2 / 3 of the total water weight to the mixture in step (1), and mix for 30s;

[0044] (3) Add machine-made sand and gravel to the slurry in step (2), and stir for 30 seconds;

[0045] (4) Add the remaining water that accounts for 1 / 3 of the total water weight into the mix...

Embodiment 2

[0049] A high-strength concrete with desulfurized gypsum as an activator, in parts by weight, 42.5 grade ordinary portland cement 100, grade I class C fly ash 70, S95 slag powder 30, activated coal gangue 35, metakaolin 0, Desulfurization gypsum 27, slaked lime 0.006, sucrose ester 0.0004, machine-made sand 370, parent rock is granite crushed stone 430, polycarboxylate superplasticizer 2.65, water 61. The specific steps of its preparation method are the same as above.

[0050] The slump is 230mm, the slump expansion is 630mm, the 60min slump is 190mm, the slump expansion is 550mm, the 3d compressive strength is 34.2MPa, the 7d compressive strength is 59.8MPa, and the 28d compressive strength is 74.6 MPa, the shrinkage rate of 28 is 572×10 -6 , 28d carbonization depth is 1.3mm, electric flux is 670C.

Embodiment 3

[0052] A high-strength concrete with desulfurized gypsum as the activator, in parts by weight, 52.5 grade Portland cement 100, grade I class C fly ash 50, S105 slag powder 60, activated coal gangue 25, metakaolin 25, desulfurization Gypsum 10, slaked lime 2.1, sucrose ester 0.001, machine-made sand 410, parent rock is granite crushed stone 510, polycarboxylate superplasticizer 2.6, water 68. The specific steps of its preparation method are the same as above.

[0053] The slump is 260mm, the slump expansion is 750mm, the 60min slump is 250mm, the slump expansion is 700mm, the 120min slump is 230mm, the slump expansion is 660mm, and the 3d compressive strength is 41.5MPa. The compressive strength of 7d is 65.2MPa, the compressive strength of 28d is 86.3MPa, and the shrinkage rate of 28 is 584×10 -6 , 28d carbonization depth is 1.0mm, electric flux is 540C.

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Abstract

The invention relates to high strength concrete adopting desulfurized gypsum as an activator, and a preparation method thereof. The high strength concrete comprises cement, fly ash, slag powder, activated coal gangue, metakaolin, desulfurized gypsum, slaked lime, sucrose ester, machine-made sand, crushed stone, a polycarboxylate superplasticizer and water according to a formula. According to the present invention, the utilization ratio of various industrial wastes by the concrete can be effectively improved, the use amount of the cement is low, and the penetration resistance, the carbonization resistance and the C1-penetration resistance of the concrete are easily improved; the significant advantages of low cost, high greening degree, carbon discharge reducing and the like are provided. The high strength concrete of the present invention is applicable for constructions of pillars of various buildings, piers and box girders of viaducts, and piers and main towers of sea-crossing bridges, and is further suitable for constructions of high strength filling piles, steel pipe concrete pillars (arches), steel-concrete combination structures, and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-strength concrete using desulfurized gypsum as an activator and a preparation method thereof. Background technique [0002] With the rapid increase in the construction of high-rise buildings, high-speed rail transit and long-span bridges in my country, the demand for high-strength concrete is increasing. According to relevant specifications, concrete with compressive strength grade C60 and above is high-strength concrete. According to statistics, before 2000, the proportion of high-strength concrete in various projects in our country did not exceed 2%, but today, 10 years later, high-strength concrete accounts for almost 6% of the total concrete consumption. In actual engineering, the preparation of high-strength concrete is a very complicated task, which is affected by many factors such as cement strength grade, type and quality of admixture, type ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B22/14C04B14/06C04B18/08
CPCY02W30/91
Inventor 徐亚玲孙振平朱永明陈柯柯黄晖皓
Owner SHANGHAI URBAN CONSTR MATERIAL CO LTD
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