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Static splitting agent for pile head of cast-in-place pile

A cast-in-situ pile and pile head technology, applied in the field of material science, can solve the problems of low efficiency of manual removal, damage and damage of the lower pile body, etc., and achieve the effects of convenient storage and transportation, large expansion force, and avoiding spray holes

Inactive Publication Date: 2021-08-17
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a static splitting agent for crushing cast-in-situ pile heads, which overcomes the shortcomings of traditional pile head removal methods such as low manual removal efficiency, and blasting removal that easily causes damage to the lower pile body.

Method used

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  • Static splitting agent for pile head of cast-in-place pile

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the pile head static splitting agent for cast-in-situ piles comprises the following steps.

[0030] (1) Use percalcined calcium oxide that has been calcined at a high temperature of about 1500°C for a calcination time of not less than 55 hours as the hydrated expansion product, Portland cement as the hydration hardening agent, expanded graphite as the cooling agent, and tartaric acid as the hydration delay Agent, aluminum powder is used as expansion agent, water reducer is UNF-4 early strength water reducer, and quartz powder is used as reinforcing material.

[0031] (2) The weight ratio of each component is: percalcined calcium oxide 70%, Portland cement 23.8%, expanded graphite 1%, tartaric acid 0.2%, aluminum powder 4.8%, UNF-4 superplasticizer 0.2%, Quartz powder 0%.

[0032] (3) The percalcined calcium oxide is ground and passed through a 0.08mm sieve, and each component material is ground and sieved and mixed according to the proportion,...

Embodiment 2

[0037] The preparation method of the pile head static splitting agent for cast-in-situ piles comprises the following steps.

[0038] (1) Use percalcined calcium oxide that has been calcined at a high temperature of about 1500°C for a calcination time of not less than 55 hours as the hydrated expansion product, Portland cement as the hydration hardening agent, expanded graphite as the cooling agent, and tartaric acid as the hydration delay Agent, aluminum powder is used as expansion agent, water reducer is UNF-4 early strength water reducer, and quartz powder is used as reinforcing material.

[0039] (2) The weight ratio of each component is: perburned calcium oxide 75%, Portland cement 15.8%, expanded graphite 1.8%, tartaric acid 0.9%, aluminum powder 3.9%, UNF-4 early strength superplasticizer 1.4%, Quartz powder 1.2%.

[0040] (3) The percalcined calcium oxide is ground and passed through a 0.08mm sieve, and each component material is ground and sieved and mixed according t...

Embodiment 3

[0044] The preparation method of the pile head static splitting agent for cast-in-situ piles comprises the following steps.

[0045] (1) Use percalcined calcium oxide that has been calcined at a high temperature of about 1500°C for a calcination time of not less than 55 hours as the hydrated expansion product, Portland cement as the hydration hardening agent, expanded graphite as the cooling agent, and tartaric acid as the hydration delay Agent, aluminum powder is used as expansion agent, water reducer is UNF-4 early strength water reducer, and quartz powder is used as reinforcing material.

[0046] (2) The weight ratio of each component is: perburned calcium oxide 79%, Portland cement 10.3%, expanded graphite 2.2%, tartaric acid 1.5%, aluminum powder 2.2%, UNF-4 early strength superplasticizer 2.1%, Quartz powder 2.7%.

[0047] (3) The percalcined calcium oxide is ground and passed through a 0.08mm sieve, and each component material is ground and sieved and mixed according t...

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Abstract

The invention relates to a static splitting agent for a pile head of a cast-in-place pile. The static splitting agent comprises, by mass, 70%-82% of overburnt calcium oxide, 3.2%-23.8% of Portland cement, 1%-2.9% of expanded graphite, 0.2%-1.2% of tartaric acid, 1.1%-4.8% of aluminum powder, 0.2%-2.5% of UNF-4 early strength water reducing agent and 0%-3.1% of quartz powder. The specific preparation method comprises the following steps: by taking overburnt calcium oxide as a hydration expansion substance, Portland cement as a hydration hardening agent, expanded graphite as a cooling agent, tartaric acid as a hydration retardant, aluminum powder as an expansion agent and quartz powder as a reinforcing material, grinding and sieving all the component substances, and mixing according to a ratio; and packaging the mixture in a plastic package after being subjected to dry stirring and uniform mixing. A using method comprises the steps that the static splitting agent is mixed and stirred into viscous liquid according to the water cement ratio of 0.3, the viscous liquid is poured into a splitting hole of a pile head, and the pile head is finally split into blocks through hydration reaction and volume expansion of the splitting agent.

Description

technical field [0001] The invention relates to a static splitting agent for pile heads of cast-in-situ piles, and belongs to the technical field of material science. Background technique [0002] Cast-in-situ pile is an important form of foundation. Its construction technology is mature and its cost is relatively low. It has been widely used in various civil engineering fields. In actual engineering, the elevation of concrete pouring is generally 500mm higher than the design elevation of the pile top To ensure that the strength of the pile head can meet the design requirements, the part of the pile top that exceeds the irrigation needs to be cut off. The removal of the pile head of the cast-in-situ pile has always been a difficult problem in the engineering field. The commonly used pile head removal method is usually accompanied by noise and dust pollution. The demolition efficiency is low, and the blasting demolition is easy to cause damage to the lower pile body. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B41/00C04B111/70
CPCC04B28/10C04B41/0009C04B2111/70C04B24/06C04B22/02C04B22/04C04B22/147C04B24/20C04B14/06
Inventor 孔德森关盛杰齐睿
Owner SHANDONG UNIV OF SCI & TECH
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