CN114349435A - C40 moderate-strength resin concrete and preparation method thereof - Google Patents
C40 moderate-strength resin concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 104
- 229920005989 resin Polymers 0.000 title claims abstract description 66
- 239000011347 resin Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000003822 epoxy resin Substances 0.000 claims abstract description 80
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 80
- 239000000843 powder Substances 0.000 claims abstract description 77
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 46
- 239000011707 mineral Substances 0.000 claims abstract description 46
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000654 additive Substances 0.000 claims abstract description 29
- 230000000996 additive effect Effects 0.000 claims abstract description 29
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 25
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 18
- 239000011398 Portland cement Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims description 39
- 238000002156 mixing Methods 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 26
- 239000003054 catalyst Substances 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 24
- 239000000945 filler Substances 0.000 claims description 20
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 17
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 17
- 239000011521 glass Substances 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
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- 238000006243 chemical reaction Methods 0.000 claims description 13
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- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 6
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
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- 238000006703 hydration reaction Methods 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 3
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
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Abstract
The application relates to the field of concrete, in particular to C40 medium-strength resin concrete and a preparation method thereof; the feed is prepared from the following raw materials in parts by weight: 230-250 parts of Portland cement, 90-110 parts of mineral powder, 60-100 parts of fly ash, 1000 parts of coarse aggregate 950, 800 parts of fine aggregate 700, 8-10 parts of an external water reducing agent, 180 parts of water 170, 80-1000 parts of a resin additive and 2-3 parts of a curing agent; the resin additive is prepared from epoxy resin and a reinforcing agent according to the mass ratio of (15-18): (1-2); the reinforcing agent is at least one of dibutyl phthalate and liquid nitrile rubber. This application has the advantage that improves the intensity of the concrete of preparation.
Description
Technical Field
The application relates to the field of concrete, in particular to C40 medium-strength resin concrete and a preparation method thereof.
Background
With the continuous development of the current society and the vigorous development of the building industry, concrete is taken as an indispensable raw material in the current building industry, and is usually formed by taking cement as a cementing material, mixed sand and stone as aggregates and adding a mixing agent and an admixture through stirring; the concrete has the characteristics of rich raw materials, low price and simple production process, can be prepared into a concrete floor slab, and is widely applied to the construction of the existing buildings.
In the above-described related art, the inventors consider that: in the existing concrete production, cement is used as a cementing material, but the strength of the concrete is insufficient due to insufficient bonding capacity of the cement to aggregate, and the prepared concrete product has the phenomenon that the aggregate falls off after being impacted or used for a period of time, so that the service life of a finished product is influenced.
Disclosure of Invention
In order to improve the strength of the prepared concrete, the application provides a C40 medium-strength resin concrete and a preparation method thereof, and the C40 medium-strength resin concrete adopts the following technical scheme:
the C40 medium-strength resin concrete is prepared from the following raw materials in parts by weight: 230-250 parts of Portland cement, 90-110 parts of mineral powder, 60-100 parts of fly ash, 1000 parts of coarse aggregate 950, 800 parts of fine aggregate 700, 8-10 parts of an external water reducing agent, 180 parts of water 170, 80-1000 parts of a resin additive and 2-3 parts of a curing agent; the resin additive is prepared from epoxy resin and a reinforcing agent according to a mass ratio of (15-18): (1-2); the reinforcing agent is at least one of dibutyl phthalate and liquid nitrile rubber.
By adopting the technical scheme, the concrete is prepared by utilizing portland cement, mineral powder, fly ash, coarse aggregate, fine aggregate, an additional water reducing agent, water, a curing agent and a resin additive, and the resin additive consisting of epoxy resin and a diluent is added; the strength of the prepared concrete is improved; meanwhile, the epoxy resin has good anti-permeability and anti-freezing performance, and the thermal expansion coefficient of the epoxy resin is similar to that of concrete, so that the epoxy resin is not easy to separate from other raw materials after being added into the concrete, and the reinforcing effect of the epoxy resin on the concrete is more stable; dibutyl phthalate or liquid nitrile rubber is added into epoxy resin to prepare a resin additive together, and the dibutyl phthalate does not contain active groups, so that the dibutyl phthalate has low viscosity, has a diluting effect on the epoxy resin after being mixed with the epoxy resin, is favorable for the diffusion of the epoxy resin in concrete, improves the dispersion uniformity of the epoxy resin in the concrete and ensures that the prepared concrete has more uniform strength; the liquid nitrile rubber has good wear resistance and heat resistance, contains active groups, can be mixed with epoxy resin, and has a toughening effect on the epoxy resin; by mixing the reinforcing agent with the epoxy resin, the dispersibility of the epoxy resin in concrete is improved, or the toughness of the epoxy resin is enhanced, so that the prepared concrete has better strength.
Preferably, the reinforcing agent is prepared from dibutyl phthalate and liquid nitrile rubber according to a mass ratio of (5-6): (3-4).
By adopting the technical scheme, the dibutyl phthalate and the liquid nitrile rubber are compounded to prepare the reinforcing agent, and after epoxy resin is toughened by the liquid nitrile rubber, the dispersity of the toughened epoxy resin in the concrete is improved through the dilution effect of the dibutyl phthalate, so that the prepared concrete has better strength and toughness.
Preferably, the mineral powder is silica fume.
By adopting the technical scheme, calcium hydroxide and ettringite can be produced in the hydration process of the portland cement, the silica fume contains highly dispersed silicon dioxide components, the silica fume can be mixed with water to generate silicon-rich gel, the silicon-rich gel aggregates among unhydrated portland cement to wrap portland cement particles, meanwhile, the calcium hydroxide produced in the hydration process of the portland cement can react with the silicon-rich gel to produce C-S-H gel, the production of the C-S-H gel improves the compactness of combination of various raw materials in the concrete, and the compactness and the strength of the prepared concrete are enhanced.
Preferably, the raw materials also comprise 30-50 parts of filler, and the filler is at least one of glass powder and stainless steel powder.
By adopting the technical scheme, the gap between the coarse aggregate and the fine aggregate is filled by adding the filler, so that the density of the interior of the prepared concrete is improved; the glass powder is used as the filler, has good anti-seepage effect on water, water vapor, electrolyte and oxygen, can prevent rainwater and salt from entering after being added into the concrete, inhibits the corrosion of the rainwater and the salt to the concrete, and prolongs the service life of the concrete; the stainless steel powder has good inertness and excellent protection in high-temperature and strong-corrosion environments, and can make up the characteristic of poor wear resistance of epoxy resin by combining with the epoxy resin, so that the wear resistance and corrosion resistance of the prepared concrete are improved; the strength and the service life of the prepared concrete can be improved by adding the filler prepared from at least one of glass powder and stainless steel powder.
Preferably, the filler is prepared from glass powder and stainless steel powder according to the mass ratio of (3-4): (1-2).
By adopting the technical scheme, the glass powder and the stainless steel powder are compounded, and the corrosion rate of the prepared concrete is slowed down by blocking rainwater and salinity by the glass powder; the addition of the stainless steel powder improves the wear resistance of the prepared concrete and prolongs the service life of the concrete; because the price of the stainless steel powder is higher and the price of the glass powder is lower, the glass powder and the stainless steel powder are compounded, so that the corrosion resistance and the wear resistance of the prepared concrete are improved, and the preparation cost of the concrete is reduced.
Preferably, before the epoxy resin is used in step S1, the epoxy resin is modified, and the epoxy resin is mainly prepared by the following steps:
1) putting the epoxy resin, the diglycol ether and the catalyst into a reaction bottle for mixing to prepare a mixture; the mass ratio of the epoxy resin to the diglycol ether is (2-3): (0.8-1.2);
2) stirring the mixture prepared in the step 1) at the stirring temperature of 140-.
Through adopting above-mentioned technical scheme, add epoxy and carry out the solidification in the concrete, epoxy's shock resistance and toughness still need to improve, adopt epoxy and diethylene glycol ether to react, diethylene glycol ether can react with the epoxy as electrophilic reagent, carry out modification treatment to epoxy through diethylene glycol ether, contain the ether linkage that structure symmetry and flexibility are good on the macromolecular chain of the product that makes the formation, thereby make epoxy's after the modification intensity and toughness obtain improving, and then make the concrete of preparation have better intensity.
Preferably, the catalyst used in the step 1) is a basic catalyst, and the mass ratio of the epoxy resin to the catalyst is (18-25): (1-2).
By adopting the technical scheme, because the acid of the diethylene glycol ether is extremely weak and the electrophilicity is not large, when no catalyst exists between the alcoholic hydroxyl group and the epoxy group, the reaction process has higher requirement on temperature, and the reaction is not easy to occur when the temperature is lower, and the temperature required by the reaction is reduced and the reaction rate is improved by adding the alkaline catalyst; the alkaline catalyst used in the method is tertiary amine, and by adjusting the mass ratio of the alkaline catalyst to the epoxy resin, when the addition amount of the alkaline catalyst is small, the catalytic effect on the reaction process of the diethylene glycol ether and the epoxy resin is insufficient, so that the reaction process of the diethylene glycol ether and the epoxy resin is slow, and the preparation efficiency of concrete is reduced; however, when the content of the basic catalyst is too much, the catalyst is wasted, the preparation cost of the concrete is high, and the storage resistance of the prepared modified epoxy resin is poor; therefore, the reaction process of the diethylene glycol ether and the epoxy resin is accelerated and the preparation cost of the concrete is reduced by adjusting the using amount of the alkaline catalyst.
In a second aspect, the application provides a preparation method of a C40 medium-strength resin concrete, which adopts the following technical scheme:
a preparation method of C40 moderate-strength resin concrete mainly comprises the following steps:
s1, mixing the mineral powder and water to prepare mineral powder slurry, mixing the coarse aggregate, the fine aggregate and half of the mineral powder slurry together to prepare a primary mixture;
s2, adding portland cement, an additional water reducing agent, fly ash, a curing agent and a resin additive into the primary mixture prepared in the step S1, and uniformly mixing to prepare a compound mixture;
and S3, adding the remaining mineral powder slurry into the compound mixed material prepared in the step S2, uniformly mixing, putting into a mould, vibrating, molding, demoulding and curing to obtain the mineral powder slurry.
By adopting the technical scheme, the mineral powder and water are mixed to prepare mineral powder slurry, the coarse aggregate, the fine aggregate and half of the mineral powder slurry are mixed, the water in the mineral powder slurry is absorbed by the coarse aggregate and the fine aggregate, and the remaining mineral powder covers the surfaces of the coarse aggregate and the fine aggregate to form a mineral powder coating layer, so that the porosity between the coarse aggregate and the fine aggregate is reduced, and the subsequent water absorption of the fine aggregate and the coarse aggregate is prevented; then adding portland cement, an additional water reducing agent, fly ash and a resin additive to mix with the primary mixture, and covering a part of portland cement and the water on the mineral powder coating layer on the surface of the primary mixture again after hydration reaction; as the mineral powder is made of silica fume, the silicate cement and the silica fume slurry react to generate C-H-S gel, and a second cement wrapping layer is formed; and finally, adding the remaining mineral powder slurry, and covering the mixed slurry formed after the mineral powder slurry and the unreacted portland cement are fully stirred outside the cement coating layer again, so that a three-layer coating layer is formed outside the coarse aggregate and the fine aggregate to form a compact mineral powder-cement structure, the interior of the generated concrete is more compact, and all raw materials in the concrete are connected more firmly through the generated C-H-S gel, so that the strength of the prepared concrete is improved.
Preferably, the mold described in step S3 is a wood mold.
Through adopting above-mentioned technical scheme, because wooden mould's gas permeability is stronger, the in-process that vibrates in putting the mould to the concrete that will mix and finish, the inside bubble of concrete breaks, and the bubble release gas after breaking, because wooden mould's gas permeability is better, can in time discharge the gas of concrete release, reduce the quantity of the inside gas pocket of concrete, improve the density of concrete, further improve the intensity of the concrete of preparation.
In summary, the present application has the following beneficial effects:
according to the epoxy resin and reinforcing agent mixed resin additive, dibutyl phthalate is used as a small molecular polymer, so that the dibutyl phthalate does not contain active groups, the viscosity is low, the epoxy resin can be diluted, and the dispersibility of the epoxy resin in concrete is improved; the liquid nitrile rubber has good wear resistance and toughness, can be mixed with epoxy resin, has a toughening effect on the epoxy resin, and is mixed with the epoxy resin through the reinforcing agent, so that the prepared concrete has good strength and toughness, and the strength of the concrete is further improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The Portland cement used in the application has the compressive strength of not less than 52.5MPa in 28 days;
the mineral powder is silica fume, and the silica fume is silica fume powder for cement concrete, and the granularity is 1250 meshes;
the coarse aggregate is limestone macadam with bulk density of 1250kg/m3；
The fine aggregate is river sand for commercial concrete;
the fly ash is used for commercial concrete;
the used external water reducing agent is a polycarboxylic acid water reducing agent for commercial concrete, and the purity is 99 percent;
the resin additive is prepared by mixing epoxy resin and a reinforcing agent, wherein the epoxy resin is industrial bisphenol A epoxy resin with the purity of 99 percent; the CAS number of dibutyl phthalate used is 84-74-2; the content of acrylonitrile in the liquid nitrile rubber is 20 percent;
the curing agent is an epoxy resin curing agent sold in the market, the curing agent used in the application is ethylenediamine, and the CAS number of the ethylenediamine is 107-15-3;
the glass powder in the used filler is high-purity glass powder, and the purity is 99.8%;
the granularity of stainless steel powder in the used filler is 500 meshes;
when the epoxy resin is modified, the CAS number of the used diethylene glycol ether is 111-46-6;
the basic catalyst used is a tertiary amine having a CAS number of 102-70-5.
Preparation example
Modified epoxy resin preparation example 1
The preparation method of the modified epoxy resin in the preparation example comprises the following steps:
1) putting the epoxy resin, the diglycol ether and the alkaline catalyst into a reaction bottle with a stirring paddle together, and stirring the reaction bottle by using the stirring paddle to uniformly mix the epoxy resin, the diglycol ether and the catalyst to prepare a mixture; the mass ratio of the epoxy resin to the diglycol ether is 2.5: 1; the mass ratio of the epoxy resin to the basic catalyst is 18: 1; the alkaline catalyst is tertiary amine;
2) stirring the mixture prepared in the step 1) for 3 hours at 145 ℃ by using a stirring paddle, wherein the stirring speed of the stirring paddle is set to be 30 r/min; and then stopping stirring, cooling to room temperature, vacuumizing the reaction bottle until no bubbles exist in the reaction bottle, relieving the vacuum, and discharging to obtain the product.
Modified epoxy resin preparation example 2
The preparation method in the modified epoxy resin preparation example is different from that in the modified epoxy resin preparation example 1 in that the mass ratio of the epoxy resin used in the step 1) to the basic catalyst is 25: 2, the rest is the same as in preparation example 1 of the modified epoxy resin.
Modified epoxy resin preparation example 3
The preparation method in the modified epoxy resin preparation example is different from that in the modified epoxy resin preparation example 1 in that the mass ratio of the epoxy resin used in the step 1) to the basic catalyst is 20: 1.5, and the rest are the same as in preparation example 1 of the modified epoxy resin.
Examples
Example 1
The strength resin concrete in C40 in the embodiment is mainly prepared by the following steps:
s1, putting 90kg of mineral powder and 170kg of water into a stirring box together for stirring, uniformly mixing to prepare mineral powder slurry, mixing 950kg of coarse aggregate and 700kg of fine aggregate, mixing with half the mass of the mineral powder slurry, and uniformly stirring to prepare a primary mixture; the mineral powder is silica fume;
s2, adding 230kg of Portland cement, 8kg of additional water reducing agent, 60kg of fly ash, 2.5kg of ethylenediamine and 80kg of resin additive into the initial mixture prepared in the step S1, and uniformly stirring to prepare a compound mixture; the resin additive is prepared from bisphenol A epoxy resin and a reinforcing agent according to a mass ratio of 16: 1.5; the reinforcing agent is dibutyl phthalate;
and S3, adding the mineral powder slurry left in the step S1 into the compound mixed material prepared in the step S2, uniformly mixing, putting into a wood die, vibrating, molding, demolding and maintaining to obtain the mineral powder slurry.
Example 2
The strength resin concrete in C40 in the embodiment is mainly prepared by the following steps:
s1, putting 110kg of mineral powder and 180kg of water into a stirring box together for stirring, uniformly mixing to prepare mineral powder slurry, mixing 1000kg of coarse aggregate and 800kg of fine aggregate, then mixing with mineral powder slurry with half mass, and uniformly stirring to prepare a primary mixture; the mineral powder is silica fume;
s2, adding 250kg of Portland cement, 10kg of additional water reducing agent, 100kg of fly ash, 2.5kg of ethylenediamine and 100kg of resin additive into the initial mixture prepared in the step S1, and uniformly mixing to prepare a compound mixture; the resin additive is prepared from bisphenol A epoxy resin and a reinforcing agent according to a mass ratio of 16: 1.5; the reinforcing agent is dibutyl phthalate;
and S3, adding the mineral powder slurry left in the step S1 into the compound mixed material prepared in the step S2, uniformly mixing, putting into a wood die, vibrating, molding, demolding and maintaining to obtain the mineral powder slurry.
Example 3
The strength resin concrete in C40 in the embodiment is mainly prepared by the following steps:
s1, putting 100kg of mineral powder and 176kg of water into a stirring box together for stirring, uniformly mixing to prepare mineral powder slurry, mixing 980kg of coarse aggregate and 760kg of fine aggregate, then mixing with half the mass of the mineral powder slurry, and uniformly stirring to prepare a primary mixture; the mineral powder is silica fume;
s2, adding 240kg of Portland cement, 9kg of additional water reducing agent, 80kg of fly ash, 2.5kg of ethylenediamine and 90kg of resin additive into the primary mixture prepared in the step S1, and uniformly stirring to prepare a compound mixture; the resin additive is prepared from bisphenol A epoxy resin and a reinforcing agent according to a mass ratio of 16: 1.5; the reinforcing agent is dibutyl phthalate;
and S3, adding the mineral powder slurry left in the step S1 into the compound mixed material prepared in the step S2, uniformly mixing, putting into a wood die, vibrating, molding, demolding and maintaining to obtain the mineral powder slurry.
Example 4
The example of the strength resin concrete in C40 in this application is different from that in example 3 in that the reinforcing agent used in step S2 is liquid nitrile rubber, and the rest is the same as in example 3.
Example 5
The embodiment of the strength resin concrete in C40 in this application is different from that in example 3 in that the reinforcing agent used in step S2 is a mixture of dibutyl phthalate and liquid nitrile rubber in a mass ratio of 4: 3, the rest being the same as in example 3.
Example 6
The embodiment of the strength resin concrete in C40 in this application is different from that in example 3 in that the reinforcing agent used in step S2 is a mixture of dibutyl phthalate and liquid nitrile rubber in a mass ratio of 6: 4, the rest being the same as in example 3.
Example 7
The embodiment of the strength resin concrete in C40 in this application is different from that in example 3 in that the reinforcing agent used in step S2 is a mixture of dibutyl phthalate and liquid nitrile rubber in a mass ratio of 5: 4, the rest being the same as in example 3.
Example 8
The strength resin concrete in C40 in this application was different from that in example 6 in that after the resin additive was added to the preliminary mixed material in step S2, 40kg of a filler, which was glass powder, was further added to the preliminary mixed material before the preliminary mixed material was stirred, and the rest was the same as that in example 6.
Example 9
The example of the strength resin concrete in C40 in this application is different from that in example 6 in that after the resin additive is added to the preliminary mixed material in step S2, 40kg of a filler is further added to the preliminary mixed material before the preliminary mixed material is stirred, the filler is stainless steel powder, and the rest is the same as that in example 6.
Example 10
The difference between the embodiment of the strength resin concrete in C40 in the present application and the embodiment 6 is that after the resin additive is added into the initial mixture in step S2, 40kg of filler is added into the initial mixture before the initial mixture is stirred, and the used filler is glass powder and stainless steel powder according to the mass ratio of 3: 1, the rest being the same as in example 6.
Example 11
The difference between the embodiment of the strength resin concrete in C40 in the present application and the embodiment 6 is that after the resin additive is added into the initial mixture in step S2, 40kg of filler is added into the initial mixture before the initial mixture is stirred, and the used filler is glass powder and stainless steel powder according to a mass ratio of 4: 2, the rest being the same as in example 6.
Example 12
The difference between the embodiment of the strength resin concrete in C40 in the present application and the embodiment 6 is that after the resin additive is added into the initial mixture in step S2, 40kg of filler is added into the initial mixture before the initial mixture is stirred, and the used filler is glass powder and stainless steel powder according to the mass ratio of 3.5: 1.5, the rest being the same as in example 6.
Example 13
The example of the strength resin concrete in C40 in this application is different from that in example 12 in that the epoxy resin in the resin additive in step S2 is prepared from modified epoxy resin preparation example 1, and the rest is the same as in example 12.
Example 14
The example of the strength resin concrete in C40 in this application is different from that in example 12 in that the epoxy resin in the resin additive in step S2 is prepared from the modified epoxy resin preparation example 2, and the rest is the same as in example 12.
Example 15
The example of the strength resin concrete in C40 in this application is different from that in example 12 in that the epoxy resin in the resin additive in step S2 is prepared from modified epoxy resin preparation example 3, and the rest is the same as in example 12.
Comparative example
Comparative example 1
The strength resin concrete in C40 of this comparative example is different from that of example 1 in that the resin additive added in step S2 is bisphenol a epoxy resin, and is the same as that of example 1 except for the above.
Comparative example 2
The strength resin concrete in C40 of this comparative example is different from example 1 in that only portland cement, an additional water reducing agent and fly ash were added to the initial mix in step S2, and the same as in example 1 was used.
Detection method
Respectively adopting the methods of examples 1-15 and comparative examples 1-2 to prepare C40 medium strength resin concrete, adopting the water seepage height method of GB/T50082-2009 to prepare concrete samples, installing the concrete samples in an impermeability tester to perform an infiltration test, ensuring that the water pressure is constant within 24h to be 1.2-1.3, splitting the concrete samples after 24h, measuring the height of the water mark by using a steel ruler, repeatedly testing 4 groups, calculating the average height value of the water mark, recording data to obtain a table 1,
the C40 medium-strength resin concrete is prepared by the methods of examples 1-15 and comparative examples 1-2 respectively, concrete floor samples with the same size are prepared by the same forming method, the compression strength of each concrete floor sample is tested by the method of GB/T5008-2002, and the data is recorded to obtain table 1;
TABLE 1 test results of compressive strength and impermeability of concrete prepared in examples 1 to 15 and comparative examples 1 to 2
As can be seen by combining examples 3 to 7 and comparative examples 1 to 2 with table 1, by adding a mixture of dibutyl phthalate and liquid nitrile rubber in a mass ratio of 5: 4, the composite reinforcing agent improves the dispersion uniformity of the epoxy resin in the concrete through the dilution effect of the dibutyl phthalate on the epoxy resin, and can improve the density of the prepared concrete while improving the strength of the prepared concrete due to the good gluing effect of the epoxy resin; the liquid nitrile rubber has good wear resistance and toughness, can play a toughening role on epoxy resin, and the prepared concrete has better compressive strength and impermeability by mixing the reinforcing agent formed by compounding dibutyl phthalate and the liquid nitrile rubber with the epoxy resin.
When examples 11 to 15 and preparation examples 1 to 3 are combined and table 1 is combined, it can be seen that when the mass ratio of the epoxy resin to the basic catalyst is 20: 1.5, the diethylene glycol ether can quickly react with the epoxy resin to modify the epoxy resin, and the modified epoxy resin macromolecular chain contains ether bonds with symmetrical structure and good flexibility, so that the strength and toughness of the modified epoxy resin are improved, and the strength and toughness of the prepared concrete are enhanced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A C40 moderate-strength resin concrete is characterized in that: the feed is prepared from the following raw materials in parts by weight: 230-250 parts of Portland cement, 90-110 parts of mineral powder, 60-100 parts of fly ash, 1000 parts of coarse aggregate 950, 800 parts of fine aggregate 700, 8-10 parts of an external water reducing agent, 180 parts of water 170, 80-1000 parts of a resin additive and 2-3 parts of a curing agent; the resin additive is prepared from epoxy resin and a reinforcing agent according to a mass ratio of (15-18): (1-2); the reinforcing agent is at least one of dibutyl phthalate and liquid nitrile rubber.
2. The C40 medium strength resin concrete according to claim 1, wherein: the reinforcing agent is prepared from dibutyl phthalate and liquid nitrile rubber according to a mass ratio of (4-6): (3-4).
3. The C40 medium strength resin concrete according to claim 1, wherein: the mineral powder is silica fume.
4. The C40 medium strength resin concrete according to claim 1, wherein: the raw materials also comprise 30-50 parts of filler, and the filler is at least one of glass powder and stainless steel powder.
5. The C40 medium strength resin concrete according to claim 4, wherein: the used filler is prepared from glass powder and stainless steel powder according to the mass ratio (3-4): (1-2).
6. The C40 medium strength resin concrete according to claim 1, wherein: before the epoxy resin is used in step S1, the epoxy resin is modified, which mainly includes the following steps:
1) putting the epoxy resin, the diglycol ether and the catalyst into a reaction bottle for mixing to prepare a mixture; the mass ratio of the epoxy resin to the diglycol ether is (2-3): (0.8-1.2);
2) stirring the mixture prepared in the step 1) at the stirring temperature of 140-.
7. The C40 medium strength resin concrete according to claim 6, wherein: the catalyst used in the step 1) is an alkaline catalyst, and the mass ratio of the epoxy resin to the catalyst is (18-25): (1-2).
8. A method for preparing the C40 moderate strength resin concrete according to claim 3, wherein the method comprises the following steps: the preparation method mainly comprises the following steps:
s1, mixing the mineral powder and water to prepare mineral powder slurry, mixing the coarse aggregate, the fine aggregate and half of the mineral powder slurry together to prepare a primary mixture;
s2, adding portland cement, an additional water reducing agent, fly ash, a curing agent and a resin additive into the primary mixture prepared in the step S1, and uniformly mixing to prepare a compound mixture;
and S3, adding the remaining mineral powder slurry into the compound mixed material prepared in the step S2, uniformly mixing, putting into a mould, vibrating, molding, demoulding and curing to obtain the mineral powder slurry.
9. The method for preparing the C40 moderate strength resin concrete according to claim 8, wherein: the mold in step S3 is a wood mold.
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