CN106927744A - The self-healing method of high performance cement-based material inside microcrack - Google Patents

The self-healing method of high performance cement-based material inside microcrack Download PDF

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Publication number
CN106927744A
CN106927744A CN201710211342.1A CN201710211342A CN106927744A CN 106927744 A CN106927744 A CN 106927744A CN 201710211342 A CN201710211342 A CN 201710211342A CN 106927744 A CN106927744 A CN 106927744A
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CN
China
Prior art keywords
cement
performance
performance cement
water
absorbent resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710211342.1A
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Chinese (zh)
Inventor
朱涵
王林照
郭文健
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Tianjin University
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Tianjin University
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Publication date
Application filed by Tianjin University filed Critical Tianjin University
Priority to CN201710211342.1A priority Critical patent/CN106927744A/en
Publication of CN106927744A publication Critical patent/CN106927744A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses the self-healing method of high performance cement-based material inside microcrack, high performance cement-based material is made up of cement, flyash, silicon ash, water, water reducer and sand, comprises the following steps:(1) water absorbent rate of super absorbent resin is tested;(2) each component of high performance cement-based material is weighed by design mixture proportion, the total water-cement ratio takes 0.31, and effective ratio of mud is less than 0.25;(3) high-performance cement-based test piece mould is arranged;(4) by super absorbent resin and cement uniform mixing;(5) each component of high performance cement-based material is operated into mix by standard criterion;(6) mould, maintenance are entered after the completion of mix.The inventive method is that unhydrated cement granules provide moisture at microcrack inside high performance cement-based material using super absorbent resin, unhydrated cement granules at crack are made to continue aquation, so as to realize high performance cement-based material inside microcrack self-healing, carrying on for crack is limited.

Description

The self-healing method of high performance cement-based material inside microcrack
Technical field
It is to be related to high performance cement-based material inside micro- specifically the present invention relates to construction material, field of civil engineering The self-healing method in crack.
Background technology
Cement-based material includes cement concrete, cement-based mortar, concrete base cleaning pulp, is civil engineering and water conservancy and hydropower work One of the most widely used construction material of journey.This kind of cement-based material has individual feature, is exactly easily to ftracture, particularly with property high Can cement-based material its ratio of mud it is often relatively low, early stage is internally dry to shrink larger, there are some researches show being less than when the ratio of mud When 0.31, part of cement can not obtain aquation, so that material is more prone to produce cracking.Cement-based material cracking has process Property, it is have internal microcrack gradually to develop expansion, once there is crack in cement-based material, will destroy the integrality of structure, drop The durability of low cement-based material, causes the service function of cement-based material structure partially or completely to be lost, and this needs to expend Substantial amounts of manpower and materials carry out reinforcing and even rebuild.Therefore, a kind of not only effective but also method of the control critical eigenvalue of practicality is found There is very great meaning.
High performance cement-based material be it is a kind of with high intensity and durable energy high mixing material, its composition has cement, water, Water reducer, mineral admixture and sand.In order to obtain high intensity and high-durability energy, it is necessary to take the less ratio of mud, usual water Gray scale is less than 0.25.
The factor for causing high performance cement-based material to ftracture be it is diversified, including cement-based material property in itself, Construction quality, temperature control measures, weather conditions etc., compare with ordinary cement sill, high performance cement-based material solidity ratio compared with Height, causes outside maintenance moisture to be difficult to enter inside, it is impossible to eliminate its internal self-desiccation shrinkage, opened so as to increased crack The possibility of exhibition.Research both at home and abroad at present improves high performance cement-based material cracking method and differs, and practical function is also uneven.
Super absorbent resin is as a kind of macromolecular material because it has excellent assimilation effect by extensive concern, height Water-absorbing resins can be divided into two major classes according to the source difference of synthetic material, and the first kind is naturally mainly to include cellulose and shallow lake Powder class, such super absorbent resin material is mainly made by being grafted hydrophilic radical on its main chain;Equations of The Second Kind is conjunction It is main including including polyacrylic acid, polyvinyl alcohol etc., wherein polyacrylic acid super absorbent resin is due to its manufacture craft into class Simply, Performance comparision stabilization, production cost is relatively low and be applied in many fields, construction material application it is more be poly- third Olefin(e) acid class, apparent is white powder.
The content of the invention
The invention aims to overcome deficiency of the prior art, there is provided high performance cement-based material inside microcrack Self-healing method, using super absorbent resin for high performance cement-based material inside microcrack at unhydrated cement granules provide Moisture, makes unhydrated cement granules at crack continue aquation, so as to realize high performance cement-based material inside microcrack self-healing, Carrying on for crack is limited, while the effective ratio of mud for making high performance cement-based material total reaches 0.31, internal cement whole Obtain aquation.
The purpose of the present invention is achieved through the following technical solutions:
The self-healing method of high performance cement-based material inside microcrack, high performance cement-based material is by cement, flyash, silicon Ash, water, water reducer and sand composition, comprise the following steps:
(1) water absorbent rate of super absorbent resin is tested;
(2) each component of high performance cement-based material is weighed by design mixture proportion, the total water-cement ratio takes 0.31, effective ratio of mud It is less than 0.25;
(3) high-performance cement-based test piece mould is arranged;
(4) by super absorbent resin and cement uniform mixing;
(5) each component of high performance cement-based material is operated into mix by standard criterion;
(6) mould, maintenance are entered after the completion of mix.
Effective ratio of mud is to remove the ratio of mud in super absorbent resin after the water of part.
Compared with prior art, the beneficial effect that technical scheme is brought is:
(1) the initial ratio of mud of high performance cement-based material is not changed.
(2) high performance cement-based material service behaviour is not changed.
(3) cement whole aquation in high performance cement-based material is made.
(4) high performance cement-based material inside microcrack self-healing is made.
(5) early-age shrinkage of high performance cement-based material is reduced.
Specific embodiment
Below by specific embodiment, the invention will be further described:
(1) using natural filtration method test super absorbent resin water absorbent rate, test water absorbent rate is 61;
(2) experiment is divided into two groups, this group and control group, and A groups and B groups are designated as respectively, and its match ratio data is as shown in table 1, Each component is precisely weighed.
The match ratio (g) of table 1
(3) two groups of test specimen institute moulds of A, B are arranged;
(4) A is assembled into composition and division in a proportion operates mix, B to assemble super absorbent resin powder and water in composition and division in a proportion according to standard criterion Mud dry mixing operates mix after two minutes according still further to standard criterion;
Enter mould, maintenance after the completion of (5) two groups of component material mixs.
(6) according to《Test method for strength of hydraulic cement mortar GB/T 17671-1999》Test two groups of A, B test specimen 3 days, 14 days, 28 days rupture strengths.
(7) according to《Building mortar basic performance tests method standard》Test two groups of test specimen free shrink data of A, B.
Two groups of test specimen rupture strengths of A, B and intensity test result are as shown in table 2.As can be seen from Table 2 in B groups by B groups test specimen is caused to test test specimen test intensity during intensity is all higher than A groups in the incorporation of super absorbent resin.In cement-based material Think that material damage is the result that internal minute crack carries on simultaneously insertion under external strength effect, experiment in broken ring theory In due to the presence of super absorbent resin, internal minute crack has self-healing function in B group test specimens, and it is small it inside to cause Crack amount is less than A groups, so causing B groups test specimen to test intensity is all higher than A groups test specimen test intensity.
2 two groups of test piece intensity test results (MPa) of table
Two groups of test specimen free shrink data test results of A, B are as shown in table 3.By in table it can be seen that B groups in due to height inhale The incorporation of water-base resin and cause B groups test specimen free shrink data that test specimen test data in A groups is respectively less than in one week, this be because It is, when the internally dry dehydration of high performance cement-based material occurs, guarantor to be absorbed by super absorbent resin can discharge its own The moisture held so that high performance cement-based material interior humidity is maintained in certain level, loses so as to reduce drying for test specimen The contraction that water brings.
3 two groups of test specimen free shrinks test result (mm) of table
The present invention is not limited to embodiments described above.Description to specific embodiment above is intended to describe and says Bright technical scheme, above-mentioned specific embodiment is only schematical, is not restricted.This is not being departed from In the case of invention objective and scope of the claimed protection, one of ordinary skill in the art may be used also under enlightenment of the invention The specific conversion of many forms is made, these are belonged within protection scope of the present invention.

Claims (2)

1. high performance cement-based material inside microcrack self-healing method, it is characterised in that high performance cement-based material by cement, Flyash, silicon ash, water, water reducer and sand composition, comprise the following steps:
(1) water absorbent rate of super absorbent resin is tested;
(2) each component of high performance cement-based material is weighed by design mixture proportion, the total water-cement ratio takes 0.31, and effective ratio of mud is Less than 0.25;
(3) high-performance cement-based test piece mould is arranged;
(4) by super absorbent resin and cement uniform mixing;
(5) each component of high performance cement-based material is operated into mix by standard criterion;
(6) mould, maintenance are entered after the completion of mix.
2. according to claim 1 high performance cement-based material inside microcrack self-healing method, it is characterised in that it is described to have The effect ratio of mud is to remove the ratio of mud in super absorbent resin after the water of part.
CN201710211342.1A 2017-03-31 2017-03-31 The self-healing method of high performance cement-based material inside microcrack Pending CN106927744A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710211342.1A CN106927744A (en) 2017-03-31 2017-03-31 The self-healing method of high performance cement-based material inside microcrack

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Application Number Priority Date Filing Date Title
CN201710211342.1A CN106927744A (en) 2017-03-31 2017-03-31 The self-healing method of high performance cement-based material inside microcrack

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109574527A (en) * 2018-12-15 2019-04-05 华南理工大学 A kind of functionality cement selfreparing manufactured aggregate and preparation method thereof
CN109836081A (en) * 2018-12-29 2019-06-04 苏州科技大学 A kind of water-proofing anticracking armored concrete

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101318786A (en) * 2008-06-26 2008-12-10 武汉大学 Uses of macromolecule water uptake-protection material as concrete anticracking agent
CN101367633A (en) * 2008-09-24 2009-02-18 武汉大学 Intelligent shrinkage reducing agent for concrete, preparation method and application thereof
CN102172978A (en) * 2011-01-25 2011-09-07 清华大学 Anti-cracking curing method for concrete

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101318786A (en) * 2008-06-26 2008-12-10 武汉大学 Uses of macromolecule water uptake-protection material as concrete anticracking agent
CN101367633A (en) * 2008-09-24 2009-02-18 武汉大学 Intelligent shrinkage reducing agent for concrete, preparation method and application thereof
CN102172978A (en) * 2011-01-25 2011-09-07 清华大学 Anti-cracking curing method for concrete

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109574527A (en) * 2018-12-15 2019-04-05 华南理工大学 A kind of functionality cement selfreparing manufactured aggregate and preparation method thereof
CN109574527B (en) * 2018-12-15 2021-09-21 华南理工大学 Functional cement self-repairing artificial aggregate and preparation method thereof
CN109836081A (en) * 2018-12-29 2019-06-04 苏州科技大学 A kind of water-proofing anticracking armored concrete
CN109836081B (en) * 2018-12-29 2021-08-24 苏州科技大学 Waterproof anti-crack reinforced concrete

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Application publication date: 20170707