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A slow-strength concrete and its application in a/b occlusal piles

A concrete and retarder technology, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problem that the initial setting time of ultra-retarded concrete cannot meet the expected requirements, and the A pile rotary excavation is difficult to cut and cannot reach Concrete strength growth and other issues

Active Publication Date: 2020-06-05
GUANGXI METALLURGICAL CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in construction practice, the initial setting time of ultra-retarded concrete cannot meet the expected requirements, and the purpose of delaying the strength growth of concrete cannot be achieved, and it cannot solve the difficulty of rotary excavation and cutting of A pile during the construction of A / B occlusal piles The problem

Method used

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  • A slow-strength concrete and its application in a/b occlusal piles
  • A slow-strength concrete and its application in a/b occlusal piles
  • A slow-strength concrete and its application in a/b occlusal piles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] On a unilateral basis, cement 199kg, water 185kg, river sand (0.25mm in diameter) 850kg, stones (5mm in diameter) 1126kg, retarder (purchased from Guangxi Dahai Building Materials Co., Ltd., model CX-1 efficient retarding water reducing Mixing agent) 3.98kg, bentonite 50kg, mix evenly to get slow-strength concrete with strength grade C10.

Embodiment 2

[0074] On a unilateral basis, according to 253kg of cement, 185kg of water, 750kg of river sand (0.5mm in particle size), 1172kg of stones (8mm in particle size), retarder (purchased from Guangxi Dahai Building Materials Co., Ltd., model CX-1 high-efficiency retarding and water-reducing 5.06kg of bentonite and 65.78kg of bentonite are mixed, and the strength grade is C15 slow-strength concrete after mixing evenly.

Embodiment 3

[0076] On a unilateral basis, according to cement 330kg, water 185kg, sea sand (particle size 0.5mm) 641kg, gravel (particle size 10mm) 1244kg, retarder (purchased from Guangxi Dahai Building Materials Co., Ltd., model CX-1 efficient retarding water reducing Mixing agent) 6.6kg, bentonite 85.8kg, and after mixing evenly, the strength grade is C20 slow-strength concrete.

[0077] The slow-strength concrete obtained in Examples 1-3 is naturally cured, and its strength grade, 7d and 28d compressive strength, slump, density and setting time are measured, and the obtained results are shown in Table 1;

[0078] Table 1 Example 1 ~ 3 obtained slow strength concrete detection data

[0079]

[0080] According to the data in Table 1, it can be seen that the 7d strength of the slow-strength concrete provided by the present invention is relatively small, only 30% to 50% of the design strength value, and the 28d strength can reach more than 100% of the design value, and the slump is sma...

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Abstract

The invention provides strength delayed concrete and an application thereof in A / B occlusive piles. In terms of dosage per cubic meter, the strength delayed concrete is prepared from components as follows: 150-350 kg of cement, 180-190 kg of water, 600-900 kg of sand, 1100-1250 kg of pebbles, 50-100 kg of an admixture and 3-7 kg of a retarder. The strength of the strength delayed concrete is increased slowly at the early stage, 7d strength is just 30%-50% of designed strength value under the natural curing condition, 28d strength can reach 100% or higher of the designed strength value, workability is good, and pouring is compacter. With application of the strength delayed concrete to the A / B occlusive piles, a pile A can be subjected to rotary excavating and cutting smoothly, and requirements of the pile A for soil blocking and water stopping can be met.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a slow-strength concrete and its application in A / B occlusal piles. Background technique [0002] In the construction process of A / B occlusal piles, the technological procedure is to construct several A piles first, after the concrete of A piles reaches a certain strength, then rotary digging and cutting A piles between A piles to form holes, and then carry out the construction of B piles , A pile and B pile are carried out alternately. When rotary cutting between piles A, if the concrete strength of pile A is too high, the construction of pile B by rotary cutting is very difficult or even impossible, so it is necessary to control its 7d strength during the concrete construction of pile A. Let the concrete strength of A pile be controlled within the strength range that can be cut when the rotary excavation of B pile cuts A pile. [0003] In order to solve this problem, the A-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02E02D5/34
CPCC04B28/02C04B2201/20C04B2201/50E02D5/34E02D2300/002C04B14/06C04B14/02C04B14/104C04B20/0076C04B2103/22C04B14/068
Inventor 刘升逑谢勇翟文佳唐世涛王巨金席郁欣胡昌武覃相荣潘洪德韦家宾黄兴相
Owner GUANGXI METALLURGICAL CONSTR
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