CN113912354A - Enhanced polymer modified pervious concrete - Google Patents
Enhanced polymer modified pervious concrete Download PDFInfo
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- CN113912354A CN113912354A CN202111393643.3A CN202111393643A CN113912354A CN 113912354 A CN113912354 A CN 113912354A CN 202111393643 A CN202111393643 A CN 202111393643A CN 113912354 A CN113912354 A CN 113912354A
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- pervious concrete
- reinforced polymer
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- modified pervious
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
- C04B28/04—Portland cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete, and particularly discloses enhanced polymer modified pervious concrete, which comprises the following raw materials in parts by weight: 1400-plus-1800 parts of coarse aggregate, 60-150 parts of fine aggregate, 350-plus-420 parts of cement, 80-140 parts of water, 10-60 parts of dispersible latex powder, 2.04-12.12 parts of early strength agent, 1.2-2.8 parts of defoaming agent, 0.48-1.92 parts of water reducing agent and 0.12-0.48 part of thickening agent. The pervious concrete prepared according to the weight ratio of the raw materials has the advantages of obviously improved working performance, obviously improved compressive strength and rupture strength and good water permeability.
Description
Technical Field
The invention relates to the field of concrete, in particular to reinforced polymer modified pervious concrete.
Background
The pervious concrete is an important road paving material in sponge city construction, and has remarkable economic benefit and ecological advantages, such as flood prevention and urban water circulation promotion; regulating and controlling the surface temperature and relieving the urban heat island effect; sound absorption and noise reduction, improvement of urban living environment and the like. At present, common pervious concrete is low in strength, easy to crack, poor in durability and limited in application, so that the performance enhancement research of the pervious concrete has important scientific value and engineering significance.
The strength source of pervious concrete is mainly determined by three factors: and bonding the aggregate, the cementing material, the slurry and the aggregate. The strength of the aggregate is often much higher than that of the pervious concrete, so the binding of the cementitious material and the slurry with the aggregate determines the upper limit of the performance of the pervious concrete. The polymer can obviously improve the fluidity and the caking property of cement paste, improve the package of the paste on aggregate, reduce the brittleness of the permeable concrete and improve the mechanical property and the durability of the permeable concrete. However, the modification effects of the polymers with different mixing amounts and types are obviously different, the polymers delay cement hydration, reduce the hydration degree of the cement, have air entraining effect, and limit the modification effects, which shows the feasibility of enhancing the performance of the polymer modified pervious concrete.
Based on the above situation, it is urgently needed to design an enhanced polymer modified pervious concrete, improve the performance of the pervious concrete, and further expand the application range of the pervious concrete.
Disclosure of Invention
The term "C-S-H crystal nucleus" in the invention refers to a C-S-H-PCE mixture obtained by taking calcium nitrate tetrahydrate as a calcium source and sodium metasilicate nonahydrate as a silicon source and performing precipitation reaction on a compounded polycarboxylic acid water reducing agent.
The invention aims to overcome the defects of the prior art and provides a reinforced polymer modified pervious concrete, which is realized by the following technical scheme:
the reinforced polymer modified pervious concrete comprises the following components in parts by weight:
wherein the content of the first and second substances,
the early strength agent comprises C-S-H crystal nucleus and triethanolamine;
the thickening agent is a cellulose ether thickening agent;
the compressive strength of the reinforced polymer modified pervious concrete is 25-30 MPa;
the flexural strength of the reinforced polymer modified pervious concrete is 5.9-7 MPa.
Further, the coarse aggregate is basalt with the particle size of 5-10 mm.
Further, the fine aggregate is river sand.
Further, the cement is P.O 42.5.5 cement.
Further, the dispersible latex powder is ethylene-vinyl acetate latex powder.
Further, the mass ratio of the C-S-H crystal nucleus to the triethanolamine is 17:1-300: 1.
Further, the C-S-H crystal nuclei have an average particle size of 25 to 35 μm and a Ca/Si ratio of 1 to 2; the C-S-H crystal nucleus contains 8-10% of water reducing agent by mass.
Further, the defoaming agent is selected from at least one of a silicone defoaming agent and a polyether defoaming agent.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
Further, the cellulose ether thickening agent is selected from at least one of hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
The invention has the following beneficial effects:
1. the dispersible latex powder can obviously improve the fluidity and the cohesiveness of cement paste, improve the wrapping of the cement paste on aggregates and enable the aggregates to be stacked more tightly. In addition, the dispersible latex powder is uniformly dispersed in a cement body, a stable net-shaped membrane structure is gradually formed along with the hydration of the cement, and the performance of an interface transition area of a cementing layer and aggregate is improved, so that the mechanical property of the pervious concrete is improved while the water permeability of the pervious concrete is ensured.
2. The early strength agent C-S-H crystal nucleus and the triethanolamine can promote the hydration of cement, improve the early strength of cement paste and ensure the stable development of later strength. Wherein the C-S-H crystal nucleus promotes the hydration of dicalcium silicate and tricalcium silicate in the cement, and the triethanolamine promotes the hydration of aluminate in the cement. In addition, the polycarboxylic acid water reducing agent which is doped in the C-S-H crystal nucleus can improve the working performance of the cement paste, and the hydroxide radical of the triethanolamine side chain reacts with the hydrogen bond of the water molecule to form a hydration film, so that the cement paste has a lubricating effect among cement particles, and the fluidity of the cement paste is improved. The difference of the promotion mechanisms enables the C-S-H crystal nucleus mixed with the water reducing agent and the triethanolamine to generate a synergistic effect, so that the crystal growth in the concrete is accelerated together, the hydration of salt in the concrete is greatly accelerated, the early strength of the concrete is improved, and the water permeability and the mechanical property of the pervious concrete are greatly improved.
3. A large amount of polar group hydroxyl in the cellulose ether thickening agent is hydrophilic and water-absorbing, so that the cellulose ether thickening agent has good water-retaining property, cement paste is wet and sticky, and is not easy to flow, so that the cellulose ether thickening agent is wrapped on the surface of aggregate more stably and uniformly to prevent slurry from sinking, and meanwhile, the cohesiveness among the aggregates can be further optimized. The defoaming agent can optimize the pore structure of the cement paste and improve the compactness of the cement paste on the one hand, and can improve the consistency of the cement paste on the other hand, so that the cement paste has better wrapping property and further improves the slurry hanging capacity. Therefore, the structure of the cement paste is optimized by the two, the viscosity of the cement paste is improved, and the working performance of the pervious concrete is greatly improved.
Detailed Description
In order to more clearly illustrate the technical solution of the present invention, the following examples are given. The starting materials, reactions and work-up procedures which are given in the examples are, unless otherwise stated, those which are customary on the market and are known to the person skilled in the art.
The embodiment of the invention selects the following materials in types and components:
coarse aggregate: basalt with the grain size of 5-10 mm;
fine aggregate: river sand;
cement: P.O 42.5.5 cement;
dispersible latex powder: VAE-850 ethylene-vinyl acetate latex powder;
C-S-H nuclei: the grain size is 30.305 mu m, the Ca/Si ratio is 1.5, and the water reducing agent with the mass fraction of 10 percent is also mixed;
cellulose ether-based thickener: hydroxyethyl cellulose;
defoaming agent: polyether defoamer with the type number of VIVID-200;
water reducing agent: a polycarboxylic acid water reducing agent, which is Sika-530P.
Example 1
The reinforced polymer modified pervious concrete comprises the following components:
wherein the early strength agent is obtained by blending 4 parts of C-S-H crystal nucleus and 0.08 part of triethanolamine;
the thickening agent is hydroxyethyl cellulose;
the compressive strength of the reinforced polymer modified pervious concrete is 25-30 MPa;
the flexural strength of the reinforced polymer modified pervious concrete is 5.9-7 MPa.
The preparation method of the reinforced polymer modified pervious concrete comprises the following steps:
1530 parts of coarse aggregate, 75 parts of fine aggregate and 44.8 parts of water are added into a stirrer to be moistened, stirred and mixed uniformly, then 400 parts of cement, 20 parts of dispersible latex powder, 4.08 parts of early strength agent, 2 parts of defoaming agent and 0.24 part of thickening agent are poured into the stirrer to be continuously stirred and mixed uniformly, and finally 67.2 parts of water and 0.96 part of water reducing agent are mixed and then added into the stirrer to be stirred uniformly to obtain the enhanced polymer modified pervious concrete.
Example 2
The reinforced polymer modified pervious concrete comprises the following components:
wherein the early strength agent is obtained by blending 8 parts of C-S-H crystal nucleus and 0.08 part of triethanolamine;
the thickening agent is hydroxyethyl cellulose;
the compressive strength of the reinforced polymer modified pervious concrete is 25-30 MPa;
the flexural strength of the reinforced polymer modified pervious concrete is 5.9-7 MPa.
The preparation method of the reinforced polymer modified pervious concrete comprises the following steps:
1530 parts of coarse aggregate, 75 parts of fine aggregate and 44.8 parts of water are added into a stirrer to be moistened, stirred and mixed uniformly, then 400 parts of cement, 20 parts of dispersible latex powder, 8.08 parts of early strength agent, 2 parts of defoaming agent and 0.24 part of thickening agent are poured into the stirrer to be continuously stirred and mixed uniformly, and finally 67.2 parts of water and 0.96 part of water reducing agent are mixed and then added into the stirrer to be stirred uniformly to obtain the enhanced polymer modified pervious concrete.
Example 3
The reinforced polymer modified pervious concrete comprises the following components:
wherein the early strength agent is obtained by blending 4 parts of C-S-H crystal nucleus and 0.08 part of triethanolamine;
the thickening agent is hydroxyethyl cellulose;
the compressive strength of the reinforced polymer modified pervious concrete is 25-30 MPa;
the flexural strength of the reinforced polymer modified pervious concrete is 5.9-7 MPa.
The preparation method of the reinforced polymer modified pervious concrete comprises the following steps:
1530 parts of coarse aggregate, 75 parts of fine aggregate and 44.8 parts of water are added into a stirrer to be moistened, stirred and mixed uniformly, then 400 parts of cement, 40 parts of dispersible latex powder, 4.08 parts of early strength agent, 2 parts of defoaming agent and 0.24 part of thickening agent are poured into the stirrer to be continuously stirred and mixed uniformly, and finally 67.2 parts of water and 0.96 part of water reducing agent are mixed and then added into the stirrer to be stirred uniformly to obtain the enhanced polymer modified pervious concrete.
Example 4
The reinforced polymer modified pervious concrete comprises the following components:
wherein the early strength agent is obtained by blending 8 parts of C-S-H crystal nucleus and 0.08 part of triethanolamine;
the thickening agent is hydroxyethyl cellulose;
the compressive strength of the reinforced polymer modified pervious concrete is 25-30 MPa;
the flexural strength of the reinforced polymer modified pervious concrete is 5.9-7 MPa.
The preparation method of the reinforced polymer modified pervious concrete comprises the following steps:
1530 parts of coarse aggregate, 75 parts of fine aggregate and 44.8 parts of water are added into a stirrer to be moistened, stirred and mixed uniformly, then 400 parts of cement, 40 parts of dispersible latex powder, 8.08 parts of early strength agent, 2 parts of defoaming agent and 0.24 part of thickening agent are poured into the stirrer to be continuously stirred and mixed uniformly, and finally 67.2 parts of water and 0.96 part of water reducing agent are mixed and then added into the stirrer to be stirred uniformly to obtain the enhanced polymer modified pervious concrete.
Comparative example 1
Compared with example 1, the permeable concrete of the comparative example is characterized in that: the dispersible latex powder, the early strength agent, the defoamer and the thickener were not added, and the rest of the preparation method was the same as that of example 1.
Comparative example 2
Compared with example 1, the permeable concrete of the comparative example is characterized in that: the other preparation methods were identical to example 1, without addition of the early strength agent, defoamer and thickener.
Comparative example 3
Compared with example 1, the permeable concrete of the comparative example is characterized in that: 40 parts of dispersible latex powder was added, and the other preparation methods were the same as in example 1, except that the early strength agent, the antifoaming agent and the thickener were not added.
Comparative example 4
Compared with example 1, the permeable concrete of the comparative example is characterized in that: the dispersible latex powder is styrene-butadiene rubber latex powder, and the other preparation methods are the same as those in the example 1.
Comparative example 5
Compared with example 1, the permeable concrete of the comparative example is characterized in that: the preparation method is the same as that of example 1 except that triethanolamine as an early strength agent is not added.
Comparative example 6
Compared with example 1, the permeable concrete of the comparative example is characterized in that: the preparation process is otherwise identical to that of example 1, without addition of the early strength agent C-S-H nuclei.
Comparative example 7
Compared with example 1, the permeable concrete of the comparative example is characterized in that: the thickener hydroxyethyl cellulose ether was not added and the remaining preparation was identical to example 1.
Test examples enhanced Polymer modified Water-permeable concrete Performance test
The test method comprises the following steps:
and testing the mechanical property and the water permeability of the cured concrete in 28d according to examples 1-4 and comparative examples 1-7, wherein the reference standard of the mechanical property test of the water permeable concrete is GB/T5081-2019 ' Standard of the test method for the physical and mechanical properties of the concrete ', and the reference standard of the water permeability test is CJJ/T135-2009 ' technical Specification for the water permeable cement concrete pavement.
And (3) testing results:
the results of the tests on the compressive strength, the flexural strength and the water permeability coefficient of the cured products of examples 1 to 4 and comparative examples 1 to 7 of 28d are shown in Table 1.
TABLE 1
| Group of | Compressive strength (MPa) | Flexural strength (MPa) | Coefficient of water permeability (mm. s)-1) |
| Example 1 | 25.5 | 5.9 | 5.04 |
| Example 2 | 26.8 | 6.1 | 4.98 |
| Example 3 | 28.4 | 6.4 | 4.92 |
| Example 4 | 29.7 | 6.8 | 4.90 |
| Comparative example 1 | 21.1 | 4.4 | 5.21 |
| Comparative example 2 | 22.6 | 4.8 | 5.13 |
| Comparative example 3 | 24.8 | 5.7 | 5.02 |
| Comparative example 4 | 24.6 | 5.6 | 4.95 |
| Comparative example 5 | 25.1 | 5.7 | 5.00 |
| Comparative example 6 | 22.9 | 4.8 | 5.15 |
| Comparative example 7 | 25.2 | 5.6 | 4.90 |
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The reinforced polymer modified pervious concrete is characterized by comprising the following components in parts by mass:
wherein the content of the first and second substances,
the early strength agent comprises C-S-H crystal nucleus and triethanolamine;
the thickening agent is a cellulose ether thickening agent;
the compressive strength of the reinforced polymer modified pervious concrete is 25-30 MPa;
the flexural strength of the reinforced polymer modified pervious concrete is 5.9-7 MPa.
2. The reinforced polymer modified pervious concrete of claim 1, wherein said coarse aggregate is basalt with a particle size of 5-10 mm.
3. The reinforced polymer-modified pervious concrete of claim 1, wherein said fine aggregate is river sand.
4. The reinforced polymer-modified pervious concrete of claim 1, wherein said cement is P.O 42.5.5 cement.
5. The reinforced polymer-modified water-permeable concrete according to claim 1, wherein the dispersible latex powder is ethylene-vinyl acetate latex powder.
6. The reinforced polymer modified pervious concrete of claim 1, wherein the mass ratio of the C-S-H crystal nuclei to triethanolamine is 17:1 to 300: 1.
7. The reinforced polymer-modified pervious concrete according to claim 1, wherein the C-S-H nuclei have an average particle size of 25 to 35 μm and a Ca/Si ratio of 1 to 2.
The C-S-H crystal nucleus contains 8-10% of water reducing agent by mass.
8. The reinforced polymer-modified pervious concrete according to claim 1, wherein said defoamer is selected from at least one of silicone defoamers and polyether defoamers.
9. The reinforced polymer-modified pervious concrete of claim 1, wherein said water reducing agent is a polycarboxylic acid water reducing agent.
10. The reinforced polymer-modified pervious concrete of claim 1, wherein said cellulose ether-based thickening agent is at least one member selected from the group consisting of hydroxyethyl cellulose and hydroxypropyl methyl cellulose.
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Citations (6)
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| CN107162473A (en) * | 2017-07-23 | 2017-09-15 | 四川华西绿舍建材有限公司 | A kind of pervious concrete special additive and its application |
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| CN111253107A (en) * | 2020-01-19 | 2020-06-09 | 武汉理工大学 | Hydramine modified calcium silicate hydrate nano crystal nucleus early strength agent and preparation method thereof |
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| CN112266217A (en) * | 2020-11-06 | 2021-01-26 | 北京众和聚源混凝土有限公司 | Pervious concrete and preparation method thereof |
| CN112830710A (en) * | 2021-01-21 | 2021-05-25 | 江苏奥莱特新材料股份有限公司 | Coupling agent modified nano calcium silicate hydrate crystal nucleus early strength agent and preparation method thereof |
-
2021
- 2021-11-23 CN CN202111393643.3A patent/CN113912354B/en active Active
Patent Citations (6)
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| CN107162473A (en) * | 2017-07-23 | 2017-09-15 | 四川华西绿舍建材有限公司 | A kind of pervious concrete special additive and its application |
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| CN111253107A (en) * | 2020-01-19 | 2020-06-09 | 武汉理工大学 | Hydramine modified calcium silicate hydrate nano crystal nucleus early strength agent and preparation method thereof |
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