CN105271878A - Preparation method of montmorillonite-modified curing agent in cement-based material - Google Patents

Preparation method of montmorillonite-modified curing agent in cement-based material Download PDF

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Publication number
CN105271878A
CN105271878A CN201510725691.6A CN201510725691A CN105271878A CN 105271878 A CN105271878 A CN 105271878A CN 201510725691 A CN201510725691 A CN 201510725691A CN 105271878 A CN105271878 A CN 105271878A
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China
Prior art keywords
montmorillonite
cement
agent
concrete
modification
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Pending
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CN201510725691.6A
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Chinese (zh)
Inventor
谭洪波
邹府兵
林超亮
马保国
李信
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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Priority to CN201510725691.6A priority Critical patent/CN105271878A/en
Publication of CN105271878A publication Critical patent/CN105271878A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a preparation method of a montmorillonite-modified curing agent in a cement-based material. The method comprises the following steps: (a) selecting raw materials; (b) dissolving acrylamide into distilled water to stir and dissolve, adding sodium hydroxide under an ice water cooling condition to adjust the pH value to neutral, adding acrylic acid and montmorillonite in sequence, stirring till the materials are fully dissolved, adding an initiating agent and a crosslinking agent in sequence, stirring uniformly, and molding in a microwave oven through microwave radiation; (c) soaking into absolute ethyl alcohol, placing the mixture into a drying oven to dry, smashing a dried product in a smasher, and screening with a sieve set. The method has the beneficial effects that (1) curing such as water spraying, spraying, water surrounding, coverage and laminating is not needed; (2) the problems of certain types of conventional concrete curing agents can be well solved, a high water absorption capability and dispersity are achieved, the cement hydration degree inside concrete can be increased effectively, and the strength is enhanced; and (3) a preparation process is simple, and convenience is brought to operation.

Description

A kind of preparation method of internal curing of cement-based materials agent of Modification of Montmorillonite
Technical field
The invention belongs to additive for building material field, be specifically related to a kind of preparation method of internal curing of cement-based materials agent of Modification of Montmorillonite.
Background technology
Along with the high speed development of China's economy and science and technology, the requirement for the Oversea bridge of super-high buildings, large span, underground structure and structures etc. is more and more higher, especially more payes attention in concrete intensity and weather resistance.At present mainly by mixing active admixture and high efficiency water reducing agent improves concrete strength.After adding high efficiency water reducing agent, the reinforcement of concrete water yield is reduced, because concrete surface and air contact surfaces are comparatively large, cement can moisture fully in ingress of air, and aquation is abundant, surface strength is high, density good, but inside can not abundant aquation, and intensity is lower, but inside concrete is but the major portion producing drag, therefore, in concrete practice of construction, concrete pouring is a very important link.
It is fully moistening that traditional concrete pouring method mainly relies on directly sprinkling or the Evaporation of absorbent material or the effect etc. of blocking of filmogen to maintain concrete surface, major way has watering, sprays, encloses water, covering, overlay film etc., these methods have only carried out maintenance to concrete surface layer, moisture is difficult to arrive region residing for inner unhydrous binder, inside concrete cannot obtain fully, maintenance in time, concrete Early self-shrinkage can be caused even to ftracture, can not meet Highrise buildings, building and lack of water arid area to concrete construction requirement.
The mode overcome the above problems at present is maintenance in using.Interior maintenance refers to that under waterproof, adiabatic condition, rely on pre-water-absorbing material to discharge moisture maintains the fully moistening method of inside concrete.Domestic interior curing agent is mainly divided three classes: one is light-weight aggregate or the haydite of vesicular structure, and its water-retaining capacity is lower; Two is pure super absorbent resins, and its dispersiveness is poor; Three is with plant amylum etc. for Material synthesis, its complex manufacturing technology and cost is higher.Therefore study and a kind ofly can overcome above problem and the interior curing agent tool with better maintenance action has very great significance, it can effectively improve inside concrete hydrated cementitious, improves intensity.
Summary of the invention
Technical problem to be solved by this invention is the preparation method proposing a kind of internal curing of cement-based materials agent of Modification of Montmorillonite for above-mentioned prior art, there is stronger water-retaining capacity, dispersed, and make simple, lasting confession water surrounding can be provided for the hydrated cementitious of inside concrete, can effectively improve concrete intensity.
Present invention employs following technical scheme: a kind of preparation method of internal curing of cement-based materials agent of Modification of Montmorillonite, is characterized in that: comprise the following steps:
A) choose raw material: by 15 ~ 30wt% montmorillonite, 25 ~ 40wt% vinylformic acid, 25 ~ 45wt% acrylamide, 5 ~ 10wt% linking agent, 5 ~ 15wt% initiator, 5 ~ 8wt% sodium hydroxide, above each component total amount is 100%, chooses starting material;
B) described acrylamide is dissolved in stirring and dissolving in distilled water, then under frozen water cooling conditions, add sodium hydroxide regulates pH to neutral, add vinylformic acid, montmorillonite successively, stir after dissolving completely and add initiator, linking agent successively again, shaping by microwave radiation in microwave oven after stirring, the reaction times is 1 ~ 2h;
C) by step b) in the product that obtains in dehydrated alcohol, soak 30 ~ 45min, then put into baking oven, in 80 ~ 90 DEG C of constant temperature drying 6 ~ 7h, the product pulverizer after drying is pulverized, again with bushing screen screening, obtain the internal curing of cement-based materials agent of particulate state Modification of Montmorillonite.
By such scheme, described initiator is any one in Potassium Persulphate, Sodium Persulfate, ammonium persulphate;
By such scheme, described linking agent is N,N methylene bis acrylamide, Viscoat 295, any one in ethylene glycol bis acrylic ester;
By such scheme, the particle diameter of described interior curing agent is 60 ~ 80 orders.
The present invention adopts montmorillonite raw material, its interlayer can adsorb a large amount of water, under concrete is in dry environment, the water of Inter layer adsorption can discharge, keep the curing condition that concrete is moistening, the interior curing agent that raw materials is made joins in concrete, has good effect to concrete maintenance.Vinylformic acid is have intelligence water suction to release water function and High hydrophilous resin stable for a long time in concrete.
Beneficial effect of the present invention is:
1) without the need to carrying out sprinkling water, spraying, enclose the maintenances such as water, covering, overlay film, save a large amount of maintenance water, manpower and material resources, avoid the problem that the maintenance because of human factor is inconsiderate;
2) better can overcome current a few class concrete inner curing agent Problems existing, there is good water-retaining capacity, dispersiveness, effectively can improve inside concrete hydrated cementitious degree, improve intensity;
3) preparation technology is simple, easy to operate.
Embodiment
For illustrating further content of the present invention, exemplifying following examples especially and the present invention is described in further detail.Embodiment provides by way of illustration, but is never only confined to content of the present invention.Protection scope of the present invention is as the criterion with claim specification sheets.
Embodiment proportioning is as shown in table 1, and specific implementation process is as follows:
(1) acrylamide is dissolved in stirring and dissolving in distilled water, under frozen water cooling conditions, then adds sodium hydroxide regulate pH to neutral.Add vinylformic acid, montmorillonite successively, stir after dissolving completely and add initiator, linking agent successively again.Shaping by microwave radiation in microwave oven after stirring, the reaction times is 1 ~ 2h;
(2) by step 1) in the product that obtains in dehydrated alcohol, soak 30 ~ 45min, then put into baking oven, in 80 ~ 90 DEG C of constant temperature drying 6 ~ 7h, product pulverizer after drying is pulverized, again with bushing screen screening, obtain the internal curing of cement-based materials agent of particulate state Modification of Montmorillonite.
The internal curing of cement-based materials agent material proportioning of table 1 Modification of Montmorillonite
Wherein, A1-A4 linking agent is N,N methylene bis acrylamide, and initiator is Potassium Persulphate;
A5-A8 linking agent is Viscoat 295, and initiator is ammonium persulphate.
To the evaluation of the product of above 8 embodiments
Concrete crushing strength carries out according to GB/T50081-2002 " standard for test methods of mechanical properties of ordinary concrete (attached provision explanation) " regulation than test, concrete mix is as shown in table 2, test design concrete strength is C30, and the effect of interior curing agent is as shown in table 3.
Table 2 concrete mix
Note: in experiment, cement used is the new P.O42.5 of China, and water reducer is polycarboxylate water-reducer.
Curing agent effect in table 3
The test of contrast numbering 1,2 can be found out, do not adding under interior maintenance and dry empty condition, concrete 7d, 28d intensity comparison with standard has larger decline, and compressive strength rate is substantially about 87%.After adding interior curing agent of the present invention, concrete 7d, 28d intensity is greatly improved compared to dry empty maintenance and under not adding interior curing agent condition, substantially the intensity under normal curing condition can be reached, its compressive strength rate is substantially all more than 95%, even more than 100%, good maintenance effect can be had.

Claims (4)

1. a preparation method for the internal curing of cement-based materials agent of Modification of Montmorillonite, is characterized in that: comprise the following steps:
A) choose raw material: by 15 ~ 30wt% montmorillonite, 25 ~ 40wt% vinylformic acid, 25 ~ 45wt% acrylamide, 5 ~ 10wt% linking agent, 5 ~ 15wt% initiator, 5 ~ 8wt% sodium hydroxide, above each component total amount is 100%, chooses starting material;
B) described acrylamide is dissolved in stirring and dissolving in distilled water, then under frozen water cooling conditions, add sodium hydroxide regulates pH to neutral, add vinylformic acid, montmorillonite successively, stir after dissolving completely and add initiator, linking agent successively again, shaping by microwave radiation in microwave oven after stirring, the reaction times is 1 ~ 2h;
C) by step b) in the product that obtains in dehydrated alcohol, soak 30 ~ 45min, then put into baking oven, in 80 ~ 90 DEG C of constant temperature drying 6 ~ 7h, the product pulverizer after drying is pulverized, again with bushing screen screening, obtain the internal curing of cement-based materials agent of particulate state Modification of Montmorillonite.
2. the preparation method of the internal curing of cement-based materials agent of a kind of Modification of Montmorillonite according to claim 1, is characterized in that: described initiator is any one in Potassium Persulphate, Sodium Persulfate, ammonium persulphate.
3. the preparation method of the internal curing of cement-based materials agent of a kind of Modification of Montmorillonite according to claim 1, it is characterized in that: described linking agent is N, N-methylene-bisacrylamide, Viscoat 295, any one in ethylene glycol bis acrylic ester.
4. the preparation method of the internal curing of cement-based materials agent of a kind of Modification of Montmorillonite according to claim 1, is characterized in that: the particle diameter of described interior curing agent is 60 ~ 80 orders.
CN201510725691.6A 2015-10-30 2015-10-30 Preparation method of montmorillonite-modified curing agent in cement-based material Pending CN105271878A (en)

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CN201510725691.6A CN105271878A (en) 2015-10-30 2015-10-30 Preparation method of montmorillonite-modified curing agent in cement-based material

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108558441A (en) * 2018-04-20 2018-09-21 万玉梅 A kind of preparation method of compound concrete curing agent
CN109516714A (en) * 2018-12-11 2019-03-26 中建商品混凝土有限公司 A kind of ceramsite carrier concrete inner curing agent and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101143770A (en) * 2007-08-24 2008-03-19 武汉市海格尔科技有限公司 Concrete inner curing agent and preparing method thereof
CN102358773A (en) * 2011-07-11 2012-02-22 桂林理工大学 Preparation method for water-preserving and salt-tolerant alkaline concrete internal curing agent
CN102557514A (en) * 2012-01-11 2012-07-11 吴剑东 Organic-inorganic matter chelated gel concrete internal curing agent and preparation method thereof
CN103496877A (en) * 2013-09-16 2014-01-08 深圳大学 Concrete internal curing agent as well as preparation method and using method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101143770A (en) * 2007-08-24 2008-03-19 武汉市海格尔科技有限公司 Concrete inner curing agent and preparing method thereof
CN102358773A (en) * 2011-07-11 2012-02-22 桂林理工大学 Preparation method for water-preserving and salt-tolerant alkaline concrete internal curing agent
CN102557514A (en) * 2012-01-11 2012-07-11 吴剑东 Organic-inorganic matter chelated gel concrete internal curing agent and preparation method thereof
CN103496877A (en) * 2013-09-16 2014-01-08 深圳大学 Concrete internal curing agent as well as preparation method and using method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108558441A (en) * 2018-04-20 2018-09-21 万玉梅 A kind of preparation method of compound concrete curing agent
CN109516714A (en) * 2018-12-11 2019-03-26 中建商品混凝土有限公司 A kind of ceramsite carrier concrete inner curing agent and preparation method thereof
CN109516714B (en) * 2018-12-11 2021-07-27 中建商品混凝土有限公司 Ceramsite carrier concrete internal curing agent and preparation method thereof

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Application publication date: 20160127