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Anti-crack concrete for wharf surface layer and preparation method for anti-crack concrete for wharf surface layer

A technology of concrete and surface layer, which is applied in the field of anti-crack concrete for wharf surface layer and its preparation. It can solve the problems of too late cutting time, concrete damage, and failure to effectively inhibit crack expansion, etc., and achieve high crack resistance and good workability Effect

Active Publication Date: 2012-07-18
CCCC THIRD HARBOR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the concrete construction of the wharf surface, it is difficult to control the cutting time. Too early cutting time will cause damage to the concrete, and too late cutting time can not effectively restrain the crack propagation

Method used

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  • Anti-crack concrete for wharf surface layer and preparation method for anti-crack concrete for wharf surface layer
  • Anti-crack concrete for wharf surface layer and preparation method for anti-crack concrete for wharf surface layer
  • Anti-crack concrete for wharf surface layer and preparation method for anti-crack concrete for wharf surface layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] 1. Preparation of anti-crack concrete for wharf surface:

[0110] The raw material components of the crack-resistant concrete for the wharf surface and their corresponding proportions are shown in Table 1-1. The raw materials used are as follows: cement is P.O42.5 cement produced by Shanghai Wanan Enterprise Corporation; Class II fly ash produced by Shanghai Xinbao Fly Ash Factory is used; Shanghai Tongji Ark Special Building Materials Co., Ltd. Changjian The polypropylene fiber produced by the brand has a diameter of 18μm, a length of 12mm, and an elastic modulus of 3500MPa; the coarse aggregate is 5-31.5 continuous graded crushed stones (based on the total weight of the continuously graded crushed stones, which contain The amount of mud is less than 0.6%, and the content of needle-shaped gravel is less than 7%); the fine aggregate is river sand with a fineness modulus greater than 2.6 and less than 3.0 (based on the total weight of the river sand, its mud content is n...

Embodiment 2

[0135] According to the preparation method of Example 1, the anti-crack concrete for the wharf surface of this example was prepared, and its raw materials and proportions are shown in Table 2-1.

[0136] Table 2-1 Raw material components and corresponding proportions of crack-resistant concrete for wharf surface

[0137]

[0138] After testing, the strength grade of the crack-resistant concrete on the wharf surface obtained in this embodiment reaches C35, the slump of the concrete is 75 mm, and the slump loss in 1 hour is less than 10 mm.

[0139] The wharf surface layer crack-resistant concrete that present embodiment obtains has good workability, and concrete slump is 75mm; Concrete compressive strength test result is: 28 days compressive strength is 43.1MPa; Record concrete plastic shrinkage result by plate test: No cracks appear; measured 180-day drying shrinkage is 341×10 -6 ; The measured 28-day splitting tensile strength is 3.46MPa, and the 90-day splitting tensile ...

Embodiment 3

[0141] According to the preparation method of Example 1, the anti-crack concrete for the wharf surface of this example was prepared, and its raw materials and proportions are shown in Table 3-1.

[0142] Table 3-1 Raw material components and corresponding proportions of crack-resistant concrete for wharf surface

[0143]

[0144] After testing, the strength grade of the crack-resistant concrete on the wharf surface obtained in this embodiment reaches C35, the slump of the concrete is 75 mm, and the slump loss in 1 hour is less than 10 mm.

[0145] The workability of the wharf surface crack-resistant concrete obtained by the present embodiment is good, and the concrete slump is 75mm; the concrete compressive strength test result is: the 28-day compressive strength is 46.5MPa; the concrete plastic shrinkage result recorded by the plate test is: No cracks appear; measured 180-day drying shrinkage is 385×10 -6 ;The measured 28-day splitting tensile strength is 3.61MPa, and the...

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Abstract

The invention relates to anti-crack concrete for a wharf surface layer and a preparation method for the anti-crack concrete for the wharf surface layer. The raw material of the anti-crack concrete for the wharf surface layer comprises the following components in weight ratio: 300-360kg / m<3> of binding material, 670-760kg / m<3> of fine aggregate, 1120-1210kg / m<3> of coarse aggregate, 3-5kg / m<3> of water reducing agent, 0.9-1.0kg / m<3> of polypropylene fibre and 145-165kg / m<3> of water. The anti-crack concrete for the wharf surface layer is good in working performance, is wide in concrete crushing strength (C25-C40) and is higher in crack resistance; plastic shrinkage shows that no cracks are generated; the shrinkage is small after the concrete is dried for 80 days; 20-day splitting tensile strength and 90-day splitting tensile strength are higher. Concrete cracks of the wharf surface layer can be effectively controlled by adopting the anti-crack concrete and a proper construction process, and thereby, the appearance, the strength and the durability of the wharf surface layer are ensured.

Description

technical field [0001] The invention relates to a wharf surface crack-resistant concrete and a preparation method thereof. Background technique [0002] With the continuous development of admixture technology, the slump of concrete has been greatly improved, and the construction technology of concrete has also been continuously developed, and pumping construction can be carried out. In order to ensure the fluidity and cohesiveness of the pumped concrete, the sand rate and the amount of cementitious materials in the pumped concrete are often large, and when mixed with mineral admixtures and admixtures, the concrete often appears large Shrinkage deforms and creates cracks. At the same time, with the formulation of the new standard of "General Portland Cement" (GB175), the cement with a strength grade of 32.5 has been cancelled, and the strength standard of cement has been greatly improved. 3 S and C 3 A content and other technical measures to improve the early strength and ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 王成启尹海卿汪冬冬徐明贤
Owner CCCC THIRD HARBOR ENG
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