CN105819735A - Polymer in-situ toughened cement base material and preparation method thereof - Google Patents
Polymer in-situ toughened cement base material and preparation method thereof Download PDFInfo
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- CN105819735A CN105819735A CN201610141002.1A CN201610141002A CN105819735A CN 105819735 A CN105819735 A CN 105819735A CN 201610141002 A CN201610141002 A CN 201610141002A CN 105819735 A CN105819735 A CN 105819735A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of construction materials, and specifically relates to a polymer in-situ toughened cement base material and a preparation method thereof. The cement base material is toughened by the following raw materials: polyvinyl alcohol, emulsion powder, an efficient water reducer, an antifoaming agent, and an early strength agent. The cement base material can be prepared by the following steps: weighing the raw materials mentioned above according to a certain ratio, dissolving raw materials into mixing water, then adding cement and aggregate into the mixing water, mixing, and stirring. The cement base material has the advantages of good fluidity, excellent workability, quick strength development, and prominently enhanced rupture strength. The toughness of cement base material is prominently improved, the application range of cement base material is largely enlarged, and the application prospect is wide.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof.
Background technology
Material is under vibration or the load action such as impact, it is possible to absorb more energy, and produces bigger deformation and the character destroyed the most suddenly is referred to as toughness.The toughness of cement-based material typically refers to the rupture strength of this type of material, and the improvement being therefore previously mentioned cement-based material rupture strength in the present invention i.e. shows that the toughness of cement-based material is improved.
Cement-based material is a kind of typical fragile material, and common cement-based material has clean slurry, mortar and concrete etc..Cement-based material has that comprcssive strength is high but feature that rupture strength is low, in actual use, easily because stress is concentrated or cracked by the effect of shear stress for a long time, and then causes durability to decline, which greatly limits the range of application of cement-based material.Such as, owing to the rupture strength of concrete is the highest and rigidity big, which has limited the application in high-grade highway of this type of material.
In order to improve the toughness of cement-based material, research worker has carried out substantial amounts of experimental study, and final most widely used method has fiber reinforced method and polymer toughening method.
Fiber reinforced method is to add fiber (such as: synthetic fibers, steel fibre and glass fibre etc.) during mixing cement-based material, utilize fiber can limit micro-crack development and fiber itself has high tenacity the two key property, effectively improve the toughness of cement-based material, but this method there is also clearly disadvantageous.First, fiber is easily united during cement-based material mix, it is difficult to be uniformly dispersed, and its toughening effect is affected bigger by fiber distribution situation in mixture and orientation situation.Secondly, many fibers are combined weak effect with cement-based material matrix, and i.e. when cement-based material destroys, the failure mode of fiber is to extract and non-stretch broken, and therefore toughening effect is the best.Synthetic fibers density is little, and filament diameter is less, there is thickening effect, is unfavorable for that the vibrations of cement-based material are closely knit.Common glass fibre then receives the restriction in application due to alkali resistance difference.
Polymer toughening method is to add polymer (such as: polymer emulsion or dry powder) during mixing cement-based material, utilizes number of polymers to be internally formed continuous print polymeric film to improve the toughness of material at cement-based material.Equally, this method there is also clearly disadvantageous.First, from mechanism of action angle, in order to be internally formed continuous print polymeric film at cement-based material, it is necessary to add more polymer, thus improve use cost.Simultaneously as the raising of polymer volume, the comprcssive strength of cement-based material substantially reduces, and the most even can seriously delay hydrated cementitious.Additionally, the curing condition of cement-based material is also required by polymer toughening method, it is unfavorable for the formation of polymeric film in the environment of general humidity is relatively big, is also unfavorable for the development of cement-based material intensity simultaneously.Finally, some polymer emulsions and cement-based material there is also the problem of bad adaptability, are likely to result in quality accident during use.
Summary of the invention
It is an object of the invention to provide a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, this in-situ flexible material can be greatly improved the toughness of cement-based material, thus is greatly improved the range of application of cement-based material.
The toughness reinforcing cement-based material of a kind of polymer in situ that the present invention proposes, toughness reinforcing raw material used is made up of polyvinyl alcohol, latex powder, high efficiency water reducing agent, defoamer and early strength agent, and the weight ratio of each component is:
Polyvinyl alcohol 100
Latex powder 2-12
High efficiency water reducing agent 0.2-2.0
Defoamer 0.004-0.080
Early strength agent 1.2-8.0
Wherein, described polyvinyl alcohol (being called for short " PVA ") has the feature that
1) molecular structural formula of described polyvinyl alcohol is (CH3CHCOOCH3)x(CH2CHOH)y, wherein: (x+y) represents the degree of polymerization, y/(x+y) and represent alcoholysis degree；
2) molecular weight ranges of described polyvinyl alcohol is (19664 ~ 117984), and alcoholysis degree is 88%；
3) any one during described polyvinyl alcohol is PVA-0488, PVA-0588, PVA-1788, PVA-2088 or PVA-2488；The statement implication of various polyvinyl alcohol is: letter part " PVA " expression " polyvinyl alcohol ", and " front two " expression of numerical portion " the thousand of the degree of polymerization, hundreds ", " latter two " expression " alcoholysis degree ".Such as " PVA-0488 " expression " degree of polymerization is 400, and alcoholysis degree is the polyvinyl alcohol of 88% ", by that analogy.
The preferable weight ratio of each component is:
Polyvinyl alcohol 100
Latex powder 4-10
High efficiency water reducing agent 0.4-1.5
Defoamer 0.008-0.050
Early strength agent 2.0-6.0
In the present invention, described latex powder is vinylacetate and ethylene copolymer rubber powder.
In the present invention, described high efficiency water reducing agent is powdery polycarboxylic acid based water reducer, water-reducing rate >=25%.
In the present invention, described defoamer is powdery organic silicon defoamer.
In the present invention, described early strength agent is calcium formate.
The preparation method of the toughness reinforcing cement-based material of polymer in situ that the present invention proposes is according to the actual requirements, after being measured by a certain percentage by above-mentioned raw material, to be dissolved in mixing water, then with gathering materials to join, cement is carried out in mixing water mix and blend.
In the present invention, polyvinyl alcohol improves the toughness of cement-based material by two kinds of approach.On the one hand, polyvinyl alcohol has good film forming characteristics, it is possible to is internally formed continuous print polymeric film at cement-based material, thus improves the toughness of cement-based material.On the other hand, polyvinyl alcohol joins the degree of polymerization that can be effectively improved C-S-H in cement-based material, and C-S-H is primary product and the important sources of cement-based material strength development of hydrated cementitious, therefore, it is possible to be effectively improved the intensity of cement-based material, the particularly rupture strength of cement-based material, thus improve the toughness of cement-based material.But, along with the improving constantly of polyvinyl alcohol volume during cement-based material mix, the viscosity of mixture significantly increases, and workability is deteriorated, and the workability of mixture is improved by the present invention by adding latex powder and high efficiency water reducing agent.Meanwhile, the toughness reinforcing of cement-based material can be played synergism with polyvinyl alcohol by the addition of latex powder.The deleterious bubbles that defoamer produces during can eliminating cement-based material mix, improves the intensity of cement-based material, particularly rupture strength.Owing to having selected multiple polymers in the present invention, and the strength development of cement-based material can be played retarding action by these polymer, and formic acid calcium the most of the present invention improves the strength development of cement-based material as early strength agent.
The present invention make use of the Toughening Properties that polyvinyl alcohol is good just, it is proposed that a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, has also used latex powder, high efficiency water reducing agent, defoamer and early strength agent in invention.The preparation technology of present invention comprcssive strength simple, on cement-based material affects little, but the rupture strength of cement-based material can be significantly improved, the most significantly improve the toughness of cement-based material, thus improve the range of application of cement-based material, have a extensive future.
Detailed description of the invention
The invention provides a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, for making the purpose of the present invention, technical scheme and effect more explicit, below by being respectively applied to the present invention only to starch, in mortar and this three classes cement-based material of concrete so that technical scheme to be described.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1, a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, according to raw-material weight ratio it is: polyvinyl alcohol (PVA-0488) 100, latex powder (vinylacetate and ethylene copolymer rubber powder) 2, high efficiency water reducing agent (powdery polycarboxylic acid based water reducer, water-reducing rate >=25%) 0.2, defoamer (powdery organic silicon defoamer) 0.004 and early strength agent (calcium formate) 1.2 weigh raw material and mix homogeneously i.e. obtains required product, it is designated as P1, standby.
Embodiment 2, a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, according to raw-material weight ratio it is: polyvinyl alcohol (PVA-0588) 100, latex powder (vinylacetate and ethylene copolymer rubber powder) 4, high efficiency water reducing agent (powdery polycarboxylic acid based water reducer, water-reducing rate >=25%) 0.4, defoamer (powdery organic silicon defoamer) 0.008 and early strength agent (calcium formate) 2.0 weigh raw material and mix homogeneously i.e. obtains required product, it is designated as P2, standby.
Embodiment 3, a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, according to raw-material weight ratio it is: polyvinyl alcohol (PVA-1788) 100, latex powder (vinylacetate and ethylene copolymer rubber powder) 6, high efficiency water reducing agent (powdery polycarboxylic acid based water reducer, water-reducing rate >=25%) 0.9, defoamer (powdery organic silicon defoamer) 0.020 and early strength agent (calcium formate) 3.5 weigh raw material and mix homogeneously i.e. obtains required product, it is designated as P3, standby.
Embodiment 4, a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, according to raw-material weight ratio it is: polyvinyl alcohol (PVA-2088) 100, latex powder (vinylacetate and ethylene copolymer rubber powder) 10, high efficiency water reducing agent (powdery polycarboxylic acid based water reducer, water-reducing rate >=25%) 1.5, defoamer (powdery organic silicon defoamer) 0.050 and early strength agent (calcium formate) 6.0 weigh raw material and mix homogeneously i.e. obtains required product, it is designated as P4, standby.
Embodiment 5, a kind of toughness reinforcing cement-based material of polymer in situ and preparation method thereof, according to raw-material weight ratio it is: polyvinyl alcohol (PVA-2488) 100, latex powder (vinylacetate and ethylene copolymer rubber powder) 12, high efficiency water reducing agent (powdery polycarboxylic acid based water reducer, water-reducing rate >=25%) 2.0, defoamer (powdery organic silicon defoamer) 0.080 and early strength agent (calcium formate) 8.0 weigh raw material and mix homogeneously i.e. obtains required product, it is designated as P5, standby.
Embodiment illustrates: in order to investigate present invention toughening effect in cement-based material comprehensively, inventor applies the present invention to only to starch, in mortar and concrete these three cement-based material, the match ratio of three kinds of cement-based materials is shown in Table 1, and the final toughening effect of the present invention refers to table 2.
Table 1 is starched only, mortar and concrete mix
Note: above-mentioned three kinds of cement-based materials all select the reference cement meeting GB8076-2008 standard, wet concentration tap water.It is designated as blank group without toughening material, adds toughening material volume in the test group of toughening material (P1 ~ P5 prepared in above-described embodiment) and be the 15% of cement quality.
Table 2 polymer in situ toughness reinforcing cement-based material application effect
| Group | Clean slurry 7d rupture strength/strength enhancing rate (MPa/%) | Mortar 7d rupture strength/strength enhancing rate (MPa/%) | Concrete seven d rupture strength/strength enhancing rate (MPa/%) |
| Blank group | 9.3/100 | 8.2/100 | 4.2/100 |
| P1 | 16.2/174 | 13.8/168 | 6.7/160 |
| P2 | 17.4/187 | 14.6/178 | 7.1/169 |
| P3 | 19.5/210 | 15.7/191 | 7.6/181 |
| P4 | 18.4/198 | 15.2/185 | 7.3/173 |
| P5 | 17.9/192 | 15.0/183 | 7.2/171 |
Claims (7)
1. the toughness reinforcing cement-based material of polymer in situ, is characterized by that the raw material for toughening cement-based materials is made up of polyvinyl alcohol, latex powder, high efficiency water reducing agent, defoamer and early strength agent, and the weight ratio of each component is:
Polyvinyl alcohol 100
Latex powder 2-12
High efficiency water reducing agent 0.2-2.0
Defoamer 0.004-0.080
Early strength agent 1.2-8.0
Wherein, described PVAC polyvinylalcohol has the feature that
1) molecular structural formula of described polyvinyl alcohol is (CH3CHCOOCH3)x(CH2CHOH)y, wherein: (x+y) represents the degree of polymerization, y/(x+y) and represent alcoholysis degree；
2) molecular weight ranges of described polyvinyl alcohol is 19664 ~ 117984, and alcoholysis degree is 88%；
3) any one during described polyvinyl alcohol is PVA-0488, PVA-0588, PVA-1788, PVA-2088 or PVA-2488；The statement implication of various polyvinyl alcohol is: letter part " PVA " expression " polyvinyl alcohol ", and " front two " expression of numerical portion " the thousand of the degree of polymerization, hundreds ", " latter two " expression " alcoholysis degree ".
A kind of toughness reinforcing cement-based material of polymer in situ the most according to claim 1, it is characterised in that each component weight ratio is:
Polyvinyl alcohol 100
Latex powder 4-10
High efficiency water reducing agent 0.4-1.5
Defoamer 0.008-0.050
Early strength agent 2.0-6.0.
A kind of toughness reinforcing cement-based material of polymer in situ the most according to claim 1, it is characterised in that described latex powder is vinylacetate and ethylene copolymer rubber powder.
A kind of toughness reinforcing cement-based material of polymer in situ the most according to claim 1, it is characterised in that described high efficiency water reducing agent is powdery polycarboxylic acid based water reducer, water-reducing rate >=25%.
A kind of toughness reinforcing cement-based material of polymer in situ the most according to claim 1, it is characterised in that described defoamer is powdery organic silicon defoamer.
A kind of toughness reinforcing cement-based material of polymer in situ the most according to claim 1, it is characterised in that described early strength agent is calcium formate.
7. the preparation method of the toughness reinforcing cement-based material of polymer in situ as claimed in claim 1, when it is characterized in that construction usage, according to the actual requirements, after raw material is measured in proportion, it is dissolved in mixing water, then cement is carried out mix and blend with gathering materials to join in mixing water.
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Cited By (3)
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| CN106495529A (en) * | 2016-10-18 | 2017-03-15 | 广东龙湖科技股份有限公司 | A kind of extraordinary mortar modifier |
| CN112851234A (en) * | 2021-01-18 | 2021-05-28 | 天津大学 | Super-toughness concrete for prefabricated part and preparation method thereof |
| CN115043627A (en) * | 2022-06-27 | 2022-09-13 | 济南大学 | High-toughness thin water-spraying cement-based material and preparation method and application thereof |
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| JP2006306647A (en) * | 2005-04-27 | 2006-11-09 | Denki Kagaku Kogyo Kk | Alumina cement composition and repairing method using the same |
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| CN104591587A (en) * | 2014-12-30 | 2015-05-06 | 中国科学院武汉岩土力学研究所 | Additive for spraying plastering mortar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106495529A (en) * | 2016-10-18 | 2017-03-15 | 广东龙湖科技股份有限公司 | A kind of extraordinary mortar modifier |
| CN112851234A (en) * | 2021-01-18 | 2021-05-28 | 天津大学 | Super-toughness concrete for prefabricated part and preparation method thereof |
| CN115043627A (en) * | 2022-06-27 | 2022-09-13 | 济南大学 | High-toughness thin water-spraying cement-based material and preparation method and application thereof |
| CN115043627B (en) * | 2022-06-27 | 2023-05-26 | 济南大学 | High-toughness thin water-spraying mud-based material, and preparation method and application thereof |
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Application publication date: 20160803 |