CN113429169A - High-strength concrete for prefabricated staircases and preparation method thereof - Google Patents
High-strength concrete for prefabricated staircases and preparation method thereof Download PDFInfo
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- CN113429169A CN113429169A CN202110713722.1A CN202110713722A CN113429169A CN 113429169 A CN113429169 A CN 113429169A CN 202110713722 A CN202110713722 A CN 202110713722A CN 113429169 A CN113429169 A CN 113429169A
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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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
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Abstract
The application relates to the technical field of concrete prefabricated products, in particular to high-strength concrete for prefabricated stairs and a preparation method thereof. The preparation raw materials of the high-strength precast concrete for the stairs comprise, by weight, 90-120 parts of coarse aggregate, 50-70 parts of fine aggregate, 30-40 parts of cement, 0.5-1 part of water reducing agent, 1-2 parts of silane coupling agent modified glass fiber, 0.5-1 part of ultrahigh molecular weight polyethylene fiber and 10-20 parts of water. The high-strength concrete for the prefabricated staircase prepared by the application has the advantages of high compressive strength and high wear resistance.
Description
Technical Field
The application relates to the technical field of concrete prefabricated products, in particular to high-strength concrete for prefabricated stairs and a preparation method thereof.
Background
The precast concrete stair has the advantages of easy design, high installation speed, easy adjustment, no crack, no gap and the like. Compared with the traditional stairs, the precast concrete stairs have the advantages that a worker does not need to arrange a complex frame when building the stairs, whether the weather is suitable or not does not need to be considered, and a large amount of time is not needed for mixing and pouring concrete. Therefore, the precast concrete stair has a wide market prospect.
At present, the concrete for precast concrete stairs is mainly prepared by taking materials such as broken stones, sand and the like as base materials, taking cement as a cementing material, adding a certain amount of additives and stirring. In recent years, with the rapid development of the domestic construction industry, higher requirements are put forward on the strength of the precast concrete for stairs.
Patent publication No. CN109650799A discloses a preparation method of concrete for a high-strength precast bridge plate, which comprises the following steps: 500 portions of cement 400-plus, 1800 portions of sand-stone mixture 1600-plus, 10-15 portions of water reducing agent, 5-10 portions of reinforcing agent, 6-8 portions of curing agent, 4-6 portions of synergist and 10-20 portions of adjuvant. The reinforcing agent is formed by mixing glass fiber, carbon fiber, asbestos and silicon carbide according to the mass ratio of (20-30) to (5-10) to (4-8) to (5-8), so that the tensile property of the concrete is effectively enhanced, and the strength of the concrete is improved.
However, in the research process of the applicant, the carbon fiber and the silicon carbide are relatively expensive, the production cost of the precast concrete stair can be increased, the asbestos has certain harm to the health of a human body, and the glass fiber is brittle and has poor wear resistance. And the compatibility of the glass fiber with the synergist and the water reducing agent is poor, and effective bonding is difficult to form between the glass fiber and each component in concrete, so that the reinforcing effect of the glass fiber is reduced.
Disclosure of Invention
In order to improve the intensity and the wearability of concrete, this application provides a high strength precast concrete for stair.
First aspect, the application provides a high strength precast concrete for stair, adopts following technical scheme to realize: the high-strength precast concrete for the stairs is prepared from, by weight, 90-120 parts of coarse aggregate, 50-70 parts of fine aggregate, 30-40 parts of cement, 0.5-1 part of water reducing agent, 1-2 parts of silane coupling agent modified glass fiber, 0.5-1 part of ultrahigh molecular weight polyethylene fiber and 10-20 parts of water.
By adopting the technical scheme, the silane coupling agent modified glass fiber is used for treating the glass fiber through the silane coupling agent, so that the wear resistance of the glass fiber is improved, and meanwhile, the silane coupling agent modified glass fiber is used for coupling the glass fiber with the water reducing agent and the ultra-high molecular weight polyethylene fiber, so that the compatibility of the glass fiber with the water reducing agent and the ultra-high molecular weight polyethylene fiber is improved, the fluidity of a concrete mixture is improved, and the lasting strength and the durability are improved. The ultra-high molecular weight polyethylene fiber has high molecular weight, high orientation degree and high crystallinity, reduces the shrinkage of concrete, improves the compactness of the concrete, and is beneficial to improving the compressive strength and the wear resistance of the concrete.
In the present application, the ultra-high molecular weight polyethylene fiber is a fiber spun from polyethylene having a weight average molecular weight of 100 to 500 ten thousand.
Preferably, the raw materials for preparing the silane coupling agent modified glass fiber comprise an aminosilane coupling agent, a vinyl silane coupling agent and a glass fiber; the mass ratio of the aminosilane coupling agent to the vinyl silane coupling agent to the glass fiber is (0.02-0.04): (0.05-0.08): 1.
By adopting the technical scheme, the glass fiber is modified by adopting the aminosilane coupling agent and the vinylsilane coupling agent together, carbon-carbon double bonds and amino groups are introduced into the surface of the glass fiber, the mass ratio of the aminosilane coupling agent to the vinylsilane coupling agent to the glass fiber is controlled to be (0.02-0.04): 0.05-0.08):1, the compatibility between the silane coupling agent modified glass fiber and the ultrahigh molecular weight polyethylene fiber as well as the sulfamic acid water reducing agent is further improved, and the concrete keeps excellent fluidity and good slump, so that the strength of the concrete is improved. Meanwhile, the glass fiber modified by the aminosilane coupling agent and the vinylsilane coupling agent can improve the interface bonding strength of the glass fiber with coarse aggregate and fine aggregate, and improve the brittleness of the glass fiber to a certain extent, so that the strength and the wear resistance of concrete are improved.
Preferably, the vinyl silane coupling agent is gamma- (methacryloyloxy) propyl trimethoxysilane.
By adopting the technical scheme, the gamma- (methacryloyloxy) propyl trimethoxy silane contains carbon-carbon double bonds and acyloxy, so that the acyloxy is introduced into the surface of the glass fiber, the brittleness of the glass fiber can be further improved, and the compatibility between the silane coupling agent modified glass fiber and the water reducing agent is improved, so that the water reducing rate of the water reducing agent is improved, the dispersing capacity of the silane coupling agent modified glass fiber, the coarse aggregate, the fine aggregate and cement is improved, and the strength of concrete is improved.
Preferably, the aminosilane coupling agent is an HD-M8372 silane coupling agent.
By adopting the technical scheme, the HD-M8372 silane coupling agent contains three amino groups, wherein the primary amino group has two active hydrogens, the reactivity is strong, the compatibility of the silane coupling agent modified glass fiber and a water reducing agent is improved, the crosslinking density of the silane coupling agent modified glass fiber and the ultrahigh molecular weight polyethylene fiber is improved, the binding property of the silane coupling agent modified glass fiber and the ultrahigh molecular weight polyethylene fiber is improved, the defects of poor wear resistance and brittleness of the glass fiber are further improved, and the strength and the wear resistance of concrete are improved.
Preferably, the water reducing agent is prepared by mixing an amino sulfonic acid water reducing agent and a lignosulfonate water reducing agent according to the mass ratio of 1 (1.4-1.8).
Preferably, the mass ratio of the sulfamic acid water reducing agent to the lignosulfonate water reducing agent is 1: 1.6.
By adopting the technical scheme, the sulfamic acid water reducing agent and the lignosulfonate water reducing agent are compounded to serve as the water reducing agent, the lignosulfonate water reducing agent has more free radicals, and the activity of the water reducing agent is improved. Under the action of the silane coupling agent modified glass fiber, the lignin sulfonate water reducing agent and the sulfamic acid water reducing agent act together, so that the segregation and bleeding phenomena of the sulfamic acid water reducing agent are improved, the bonding strength of the water reducing agent and the silane coupling agent modified glass fiber is improved, the comprehensive performance of concrete is improved, and particularly, when the mass ratio of the sulfamic acid water reducing agent to the lignin sulfonate water reducing agent is 1:1.6, the mechanical property and the wear resistance of the concrete are better.
Preferably, the preparation raw material also comprises 0.2-0.5 weight part of cellulose acetate butyrate.
By adopting the technical scheme, the cellulose acetate-butyrate contains hydroxyl, and the cellulose acetate-butyrate and the silane coupling agent modified glass fiber and the water reducing agent act together, so that the leveling property of the concrete and the compatibility of the silane coupling agent modified glass fiber and the water reducing agent can be improved, and the flexibility and the wear resistance of the concrete can also be improved.
Preferably, the cellulose acetate butyrate has an acetyl content of 2wt% and a butyryl content of 52-53 wt%.
By adopting the technical scheme, the cellulose acetate-butyrate with the acetyl content of 2wt% and the butyryl content of 52-53wt% can improve the dispersibility of coarse aggregate, fine aggregate, cement and silane coupling agent modified glass fiber, and meanwhile, the cellulose acetate-butyrate with the acetyl content of 2wt% and the butyryl content of 52-53wt% has higher adhesive force, can promote the crosslinking density of the cellulose acetate-butyrate and the ultra-high molecular weight polyethylene fiber, and is beneficial to improving the strength of concrete.
In a second aspect, the application provides a preparation method of high-strength precast concrete for stairs, which adopts the following technical scheme:
a preparation method of high-strength precast concrete for stairs comprises the following steps:
s1, uniformly mixing the coarse aggregate, the fine aggregate and the cement to obtain a mixture;
s2, uniformly mixing the silane coupling agent modified glass fiber, the water reducing agent and the ultrahigh molecular weight polyethylene fiber to obtain an external charging material;
and S3, adding the cellulose acetate-butyrate into water, uniformly mixing, adding the additional material prepared in the step S2, uniformly mixing, adding the mixture prepared in the step S1, and uniformly stirring to obtain the high-strength concrete for the prefabricated staircase.
By adopting the technical scheme, the preparation method of the high-strength concrete for the prefabricated staircase is simple, the silane coupling agent modified glass fiber, the water reducing agent and the ultra-high molecular weight polyethylene fiber are premixed, the strength and the wear resistance of the concrete can be improved, and the silane coupling agent modified glass fiber can be better enhanced by adding the coarse aggregate, the fine aggregate and the cement into the mixture.
In summary, the present application has the following beneficial effects:
1. according to the application, the silane coupling agent is adopted to modify the glass fiber, the glass fiber is treated through the silane coupling agent, the wear resistance of the glass fiber is improved, meanwhile, the silane coupling agent modifies the glass fiber to enable the glass fiber to be coupled with the water reducing agent and the ultra-high molecular weight polyethylene fiber, the compatibility of the glass fiber with the water reducing agent and the ultra-high molecular weight polyethylene fiber is improved, the fluidity of a concrete mixture is improved, and therefore the lasting strength and the durability are improved.
2. The glass fiber is preferably modified by adopting the aminosilane coupling agent and the vinylsilane coupling agent together, carbon-carbon double bonds and amino groups are introduced on the surface of the glass fiber, the compatibility between the silane coupling agent modified glass fiber and the ultrahigh molecular weight polyethylene fiber and the aminosulfonic acid water reducing agent is further improved, the interface bonding strength between the glass fiber and the coarse aggregate and between the glass fiber and the fine aggregate can be improved, the brittleness of the glass fiber is improved to a certain extent, and the strength and the wear resistance of concrete are improved.
3. According to the application, the sulfamic acid water reducing agent and the lignosulfonate water reducing agent are preferably compounded to serve as the water reducing agent, so that the segregation and bleeding phenomena of the sulfamic acid water reducing agent are improved, the bonding strength of the water reducing agent and the silane coupling agent modified glass fiber is improved, and the comprehensive performance of concrete is improved.
4. The cellulose acetate-butyrate is preferably added, and the cellulose acetate-butyrate and the silane coupling agent modified glass fiber and the water reducing agent act together, so that the leveling property of the concrete can be improved, the strength of the silane coupling agent modified glass fiber is not influenced, the flexibility of the silane coupling agent modified glass fiber can be improved, and the wear resistance of the concrete is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in the present application are commercially available, and if not otherwise specified, the raw materials not mentioned in the preparation examples, examples and comparative examples of the present application are purchased from national drug group chemical agents limited.
Preparation example
Preparation examples 1 to 7 provide a silane coupling agent-modified glass fiber, and the following description will be given by taking preparation example 1 as an example.
The silane coupling agent modified glass fiber provided by preparation example 1 is prepared by the following steps:
adding 0.2kg of aminosilane coupling agent and 0.5kg of vinyl silane coupling agent into 1000L of 95 wt% ethanol aqueous solution, stirring at the speed of 600rpm for 30min at 25 ℃, adding 10kg of glass fiber, heating to 80 ℃, stirring at the speed of 600rpm at 80 ℃ for reaction for 1h, filtering, washing the upper-layer solid with absolute ethyl alcohol for 3 times, washing with deionized water for 3 times, and drying to obtain silane coupling agent modified glass fiber;
the amino silane coupling agent is HD-E8133X silane coupling agent and is purchased from Qingdao Hengda Zhongcheng science and technology Limited; the vinyl silane coupling agent is vinyl trimethoxy silane with CAS number 220-449-8.
Preparation examples 2 to 5 differed from preparation example 1 only in that: the mass of the aminosilane coupling agent and vinylsilane coupling agent is shown in table 1.
TABLE 1 preparation examples 1 to 5 Mass/kg of aminosilane coupling agent and vinylsilane coupling agent
Preparation 6 differs from preparation 4 only in that: the vinyl silane coupling agent is gamma- (methacryloyloxy) propyl trimethoxy silane, and the CAS number is 2530-85-0.
Preparation 7 differed from preparation 6 only in that: the aminosilane coupling agent is HD-M8372 silane coupling agent and is purchased from Hongkong Zhongcheng science and technology Limited company in Qingdao.
Preparation of comparative example
Comparative example 1 was prepared, differing from preparation example 1 only in that: the HD-E8133X silane coupling agent and the like are replaced by vinyltrimethoxysilane in quality.
Comparative example 2 was prepared, differing from preparation example 1 only in that: the vinyltrimethoxysilane and the like are replaced by HD-E8133X silane coupling agent.
Examples
Examples 1 to 20 provide a high-strength precast concrete for a staircase, which will be described below by taking example 1 as an example.
The high-strength precast concrete for stairs provided in example 1 is prepared by the following steps:
s1, mixing 90kg of coarse aggregate, 50kg of fine aggregate and 30kg of cement, and stirring at the stirring speed of 800rpm for 20min to obtain a mixture;
s2, mixing 1kg of silane coupling agent modified glass fiber, 0.5kg of water reducing agent and 0.5kg of ultra-high molecular weight polyethylene fiber, and stirring at the stirring speed of 600rpm for 30min to obtain an external charging material;
s3, adding the external material prepared in the step S2 into 10kg of water, stirring for 10min at the stirring speed of 600rpm, then adding the mixture prepared in the step S1, and stirring for 30min at the stirring speed of 800rpm to obtain the high-strength precast concrete for the stairs;
wherein the particle size of the coarse aggregate is 10-20 mm;
the particle size of the fine aggregate is less than 5 mm;
the cement is 'grassroots' brand cement 42.5R, and is purchased from Shandong grassroots cement Co., Ltd;
the silane coupling agent modified glass fiber is derived from preparation example 1;
the water reducing agent is a HT-AS sulfamate high-performance water reducing agent which is purchased from Huangteng building materials Co.Ltd, Guizhou;
the ultra-high molecular weight polyethylene fiber is a fiber spun by polyethylene with the weight-average molecular weight of 200 ten thousand, and the fineness of the ultra-high molecular weight polyethylene fiber is 50D and is purchased from Shenzhen special mechanical fibers GmbH.
Examples 2-3, like example 1, differ only in that: the quality of the raw materials for preparing the high-strength precast concrete for the staircase is shown in table 2.
TABLE 2 examples 1-3 Mass/kg of starting materials prepared
Examples 4-11, like example 3, differ only in that: the source of the silane coupling agent modified glass fibers is shown in table 3.
Table 3 examples 3-11 sources of silane coupling agent modified glass fibers
Example 12, like example 9, differs only in that: the water reducing agent is MN-3 sodium lignosulfonate, and is purchased from Jinnan Monghun chemical Co.
Example 13, like example 9, differs only in that: the water reducing agent is prepared by mixing HT-AS sulfamate high-performance water reducing agent and MN-3 sodium lignosulfonate according to the mass ratio of 1: 1.4.
Example 14, like example 13, differs only in that: the mass ratio of the HT-AS sulfamate high-performance water reducing agent to the MN-3 sodium lignosulfonate is 1: 1.8.
Example 15, like example 13, differs only in that: the mass ratio of the HT-AS sulfamate high-performance water reducing agent to the MN-3 sodium lignosulfonate is 1: 1.6.
Example 16, like example 15, differs only in that: the starting material also included 0.2kg of a cellulose acetate butyrate, model CAB-381-0.5, having an acetyl content of 13.5 wt% and a butyryl content of 38 wt%, purchased from eastman, usa.
Example 16 provides a high strength precast concrete for a staircase, which is prepared by the steps of:
s1, mixing 100kg of coarse aggregate, 60kg of fine aggregate and 35kg of cement, and stirring at the stirring speed of 800rpm for 20min to obtain a mixture;
s2, mixing 1.5kg of silane coupling agent modified glass fiber, 0.7kg of water reducing agent and 0.7kg of ultra-high molecular weight polyethylene fiber, and stirring at the stirring speed of 600rpm for 30min to obtain an external additive;
s3, adding 0.2kg of cellulose acetate-butyrate into 15kg of water, uniformly mixing, adding the external material prepared in the step S2, stirring at the stirring speed of 600rpm for 10min, adding the mixture prepared in the step S1, and stirring at the stirring speed of 800rpm for 30min to obtain the high-strength precast concrete for the stairs.
Example 17, like example 16, differs only in that: the mass of the cellulose acetate butyrate was 0.5 kg.
Example 18, like example 16, differed only in that: the mass of the cellulose acetate butyrate was 0.3 kg.
Example 19, like example 18, differs only in that: the cellulose acetate-butyrate was model CAB-381-0.2, with an acetyl content of 2wt% and a butyryl content of 52 wt%, and was purchased from eastman, usa.
Example 20, like example 18, differs only in that: the cellulose acetate-butyrate was model CAB-381-0.01, with an acetyl content of 2wt% and a butyryl content of 53wt%, and was purchased from eastman, usa.
Comparative example
Comparative example 1, which differs from example 1 only in that: the silane coupling agent modified glass fiber and the like are replaced by glass fiber.
Comparative example 2, which differs from example 1 only in that: the ultra-high molecular weight polyethylene fiber and the like are replaced by silane coupling agent modified glass fiber (from preparation example 1).
Performance test
The concrete for the high-strength precast stair provided by the examples 1 to 20 and the comparative examples 1 to 2 of the application comprises the following specific processes: the high strength precast concrete for staircases described in examples 1 to 20 and comparative examples 1 to 2 was molded into a sample in a standard precast staircase mold (1 st 1 block) manufactured by zheng zeno masa housing installation ltd, and the samples described in examples 1 to 20 and comparative examples 1 to 2 were subjected to the following performance tests.
1. Compressive strength: the samples described in examples 1-20 and comparative examples 1-2 were cured in a standard curing room, and after 7d and 28d, the test was carried out according to the compressive strength test in GB/T50081-2019 "test method Standard for physical and mechanical Properties of concrete", each sample was tested 3 times, and the arithmetic mean of the 3 measured values was taken as the compressive strength of the sample, and the test results are shown in Table 4.
2. Abrasion resistance: the abrasion resistance of the samples described in examples 1-20 and comparative examples 1-2 was tested with reference to GB/T19766-.
TABLE 4 test results of compressive strength and abrasion resistance
The present application is described in detail below with reference to the test data provided in table 4.
As can be seen from the example 1 and the comparative example 1, the silane coupling agent modified glass fiber is adopted in the example 1, the unmodified glass fiber is adopted in the comparative example 1, the compressive strength and the wear resistance of the example 1 are obviously higher than those of the comparative example 1, and the silane coupling agent modified glass fiber is used for treating the glass fiber through the silane coupling agent, so that the wear resistance of the glass fiber is improved, and meanwhile, the compatibility of the glass fiber with a water reducing agent and an ultrahigh molecular weight polyethylene fiber is improved, so that the compressive strength of concrete is improved.
From the application of example 1 and comparative example 2, the comparative example 2 has no ultrahigh molecular weight polyethylene fiber, the example 1 has ultrahigh molecular weight polyethylene fiber, and the compressive strength and the wear resistance of the comparative example 2 are obviously lower than those of the example 1, which shows that the addition of the ultrahigh molecular weight polyethylene fiber reduces the shrinkage of concrete, improves the compactness of the concrete, and improves the compressive strength and the wear resistance of the concrete.
From the examples 3 and 10-11 of the present application, the example 10 only contains vinyl trimethoxy silane, the example 11 only contains amino silane coupling agent, the example 3 contains amino silane coupling agent and vinyl silane coupling agent, the compressive strength and the wear resistance of the example 3 are obviously higher than those of the examples 10-11, which shows that the glass fiber is modified by the amino silane coupling agent and the vinyl silane coupling agent together, carbon-carbon double bond and amino group are introduced on the surface of the glass fiber, and the compatibility between the silane coupling agent modified glass fiber, the ultra-high molecular weight polyethylene fiber and the sulfamic acid water reducing agent is further improved, so that the strength of the concrete is improved, the interface bonding strength between the glass fiber, the coarse aggregate and the fine aggregate is also improved, the brittleness of the glass fiber is improved to a certain extent, and the strength and the wear resistance of the concrete are improved.
It can be seen from examples 6 and 8 of the present application that gamma- (methacryloyloxy) propyl trimethoxysilane is used in example 8, vinyl trimethoxysilane is used in example 6, and gamma- (methacryloyloxy) propyl trimethoxysilane contains acyloxy in example 8, which further improves the defect of poor brittleness of the glass fiber, further improves the compatibility between the silane coupling agent modified glass fiber and the water reducing agent, and improves the dispersing ability of the silane coupling agent modified glass fiber, the coarse aggregate, the fine aggregate and the cement, and further improves the strength of the concrete.
From the examples 8 to 9, the HD-E8133X silane coupling agent is adopted in the example 8, the HD-M8372 silane coupling agent is adopted in the example 9, and the HD-M8372 silane coupling agent contains three amino groups, wherein two active hydrogens are arranged on the primary amino group, so that the reactivity is strong, the compatibility of the silane coupling agent modified glass fiber and the water reducing agent is improved, the crosslinking density of the silane coupling agent modified glass fiber and the ultrahigh molecular weight polyethylene fiber is improved, the defects of poor wear resistance and brittleness of the glass fiber are further improved, and the strength and the wear resistance of the concrete are improved.
From examples 9 and 12 to 15 of the present application, it is understood that, in example 13, compared with examples 9 and 12, the combination of the sulfamic acid water reducing agent and the lignosulfonate water reducing agent is used as the water reducing agent, so that the bonding strength and compatibility of the water reducing agent and the silane coupling agent modified glass fiber are improved, and the compressive strength and the wear resistance of the concrete are improved. Compared with examples 13 to 14, in example 15, the mass ratio of the aminosulfonic acid water-reducing agent to the lignosulfonate water-reducing agent was 1:1.6, and the strength and the wear resistance of the concrete were better.
From examples 15 to 16 of the present application, it is understood that the addition of cellulose acetate butyrate in example 16 significantly improves the abrasion resistance of concrete, as compared with example 15.
From examples 18 to 20 of the present application, it is understood that in example 20, CAB-381-0.01 having an acetyl group content of 2wt% and a butyryl group content of 53wt% was used, and the strength of the concrete was further improved.
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. The high-strength precast concrete for the stairs is characterized by comprising, by weight, 90-120 parts of coarse aggregate, 50-70 parts of fine aggregate, 30-40 parts of cement, 0.5-1 part of a water reducing agent, 1-2 parts of silane coupling agent modified glass fiber, 0.5-1 part of ultrahigh molecular weight polyethylene fiber and 10-20 parts of water.
2. The concrete for the high-strength precast stairway as claimed in claim 1, wherein the silane coupling agent modified glass fiber is prepared from raw materials including an aminosilane coupling agent, a vinylsilane coupling agent and a glass fiber; the mass ratio of the aminosilane coupling agent to the vinyl silane coupling agent to the glass fiber is (0.02-0.04): (0.05-0.08): 1.
3. The high-strength precast concrete for stairs of claim 2, wherein the vinyl silane coupling agent is gamma- (methacryloyloxy) propyl trimethoxy silane.
4. The high-strength precast concrete for stairs of claim 2, wherein said aminosilane coupling agent is HD-M8372 silane coupling agent.
5. The concrete for the high-strength precast stair is characterized in that the water reducing agent is formed by mixing an amino sulfonic acid water reducing agent and a lignosulfonate water reducing agent according to the mass ratio of 1 (1.4-1.8).
6. The concrete for the high-strength precast stair according to claim 5, wherein the mass ratio of the sulfamic acid water reducer to the lignosulfonate water reducer is 1: 1.6.
7. The concrete for prefabricated stairways as claimed in any one of claims 1 to 6, wherein said raw material for preparation further comprises 0.2 to 0.5 parts by weight of cellulose acetate butyrate.
8. The precast concrete for stairs of claim 7, wherein said cellulose acetate butyrate has an acetyl group content of 2wt% and a butyryl group content of 52-53 wt%.
9. The method for preparing the high-strength precast concrete for the stairs of claim 7, comprising the following steps of:
s1, uniformly mixing the coarse aggregate, the fine aggregate and the cement to obtain a mixture;
s2, uniformly mixing the silane coupling agent modified glass fiber, the water reducing agent and the ultrahigh molecular weight polyethylene fiber to obtain an external charging material;
and S3, adding the cellulose acetate-butyrate into water, uniformly mixing, adding the additional material prepared in the step S2, uniformly mixing, adding the mixture prepared in the step S1, and uniformly stirring to obtain the high-strength concrete for the prefabricated staircase.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114105561A (en) * | 2021-11-24 | 2022-03-01 | 深圳市天地东建混凝土有限公司 | Recycled concrete based on inorganic fibers and preparation method thereof |
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Application publication date: 20210924 |