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Micro pile mortar admixture

An admixture and micro-pile technology, which is applied in the field of geotechnical engineering, can solve problems such as micro-pile structural failure, passivation film damage, and protective layer damage, achieving significant economic benefits, cost savings, and improving compression and flexural resistance performance effect

Inactive Publication Date: 2013-09-11
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the mortar cracks, or the pH value of the pore fluid drops to a certain level, or the erosion of chloride ions, the passivation film will be destroyed, the protective layer will be destroyed, and the steel bars will corrode, which will cause the failure of the micropile structure.

Method used

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  • Micro pile mortar admixture
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Component according to the amount of cement: polypropylene fiber 0.2%, fly ash 0.5%, FDN naphthalene series superplasticizer 0.3%, U-type expansion agent 1%.

[0014] The mixing amount is 2% of the cement amount.

[0015] Table 1 Mechanics test items

[0016]

[0017] Table 2 Test results

[0018]

Embodiment 2

[0020] Component according to the amount of cement: polypropylene fiber 0.5%, fly ash 1%, FDN naphthalene series superplasticizer 0.5%, U-type expansion agent 3%.

[0021] The mixing amount is 5% of the cement amount.

[0022] Table 3 Mechanical test items

[0023]

[0024] Table 4 Test results

[0025]

Embodiment 3

[0027] Component according to the amount of cement: polypropylene fiber 0.28%, fly ash 0.75%, superplasticizer 0.43%, expansion agent 2.04%.

[0028] The mixing amount is 3.5% of the cement amount.

[0029] Table 5 Mechanical test items

[0030]

[0031] Table 6 Test results

[0032]

[0033] It can be seen from Tables 1 to 6 that among the various indexes of cement mortar 7d and 28d with admixtures, except for some of the 7d tensile indexes which are slightly lower than ordinary cement mortar, the others are all higher than ordinary cement mortar to varying degrees. In Example 3, the compressive and flexural indexes of 7d were 20.27% and 73.79% higher than those of ordinary cement mortar, and the tensile strength was slightly lower by 5.36%; the 3 indexes of 28d were 4.27%, 40.53% and 19.74% higher respectively. It shows that adding MPC-I type anti-corrosion additives to cement mortar can greatly improve the compressive and flexural properties of cement mortar, and it can improve th...

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Abstract

The invention discloses a micro pile mortar admixture which is used for preventing mortar from corrosion due to environment interferences and preventing the mortar from cracking in a hardening process and cracking in a using process. The admixture comprises the following components in percentage by weight (based on the dosage of cement): 0.2%-0.5% of polypropylene fiber, 0.5%-1% of coal ash, 0.3%-1.5% of FDN naphthalene-series efficient water reducing agent and 1%-3% of U type expanding agent, which are used as a mixing type additive for mixing pile body mortar, wherein the mixing amount is 2%-5% of the dosage of the cement.

Description

Technical field [0001] The invention relates to geotechnical engineering, in particular to a micro-pile mortar admixture, which prevents the mortar body from corroding due to environmental influences, and cracks in the mortar hardening process or cracks in use. Background technique [0002] The micro-pile composite structure is a spatial network structure composed of steel bars, mortar, and concrete, which is widely used in slope reinforcement projects. The micro-pile is deep into the rock and soil, and the roof or frame is partially buried in the soil and partially exposed to the atmosphere. Under normal circumstances, the pH value of the pore fluid in the mortar is greater than 12.5. This high alkalinity will form a passive film on the surface of the steel bar, which will isolate the steel bar from corrosive substances, and the corrosion of the steel bar cannot occur. In other words, as long as the passive film of the steel bar exists, the steel does not need to consider its c...

Claims

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Application Information

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IPC IPC(8): C04B24/26
Inventor 梁瑶蒋楚生李庆海贺钢汤涌王唤龙
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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