CN108129091B - CF50 concrete preparation process - Google Patents

CF50 concrete preparation process Download PDF

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Publication number
CN108129091B
CN108129091B CN201711498503.6A CN201711498503A CN108129091B CN 108129091 B CN108129091 B CN 108129091B CN 201711498503 A CN201711498503 A CN 201711498503A CN 108129091 B CN108129091 B CN 108129091B
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parts
reagent
concrete
macadam
water
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CN108129091A (en
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王小均
马占民
张�林
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Chengdu Precision Concrete Co ltd
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Chengdu Precision Concrete Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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

Abstract

The invention relates to a CF50 concrete preparation process, which comprises the following components by weight: 170 parts of 160-class water, 360 parts of 350-class cement, 150 parts of 140-class fly ash, 30-40 parts of micro-siliceous dust, 700 parts of medium sand, 1100 parts of 1050-class gravel, 38-45 parts of steel fiber, 0.5-1.0 part of dispersant and 9.1-9.5 parts of water reducer, wherein the gravel comprises 750 parts of 700-class small gravel and 280 parts of 250-class large gravel, the particle size of the small gravel is 5-25mm, and the particle size of the large gravel is 5-10 mm. The gluing agent in this scheme adopts cement, fly ash and little silica fume, the rubble includes large-scale rubble and small-size rubble, use large-scale rubble as the aggregate, small-size rubble is filled wherein, a structural strength for guaranteeing the concrete, and cement, fly ash and little silica fume are the fine and smooth powder of texture, become the gluing agent after mixing with water, little silica fume wherein is used for strengthening concrete hardness, steel fibre is used for strengthening the toughness of concrete, the concrete that the preparation was obtained has better anti-cracking effect, and be difficult for the ash, structural strength is higher.

Description

CF50 concrete preparation process
Technical Field
The invention relates to concrete, in particular to a CF50 concrete preparation process.
Background
The concrete is cement concrete which is prepared by mixing cement as a cementing material and sand and stone as aggregates with water according to a certain proportion and stirring, is also called ordinary concrete and can be widely applied to wood-soil engineering.
The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like, and the characteristics ensure that the concrete has wide application range, is used in various civil engineering, namely shipbuilding industry, mechanical industry, ocean development, geothermal engineering and the like, and is also an important material.
According to the standard GB/T50081-223 of the general concrete mechanical property test method in China, a cube with the side length of 150mm is manufactured, the cube is maintained to the age of 28d under the standard maintenance condition, and the ultimate compressive strength measured by the standard test method is called the compressive strength of the concrete standard cube and is expressed by fcu. As disclosed in chinese patent publication No. CN1482317A, the number of private cars is increasing and the number of parked cars is also increasing along with the improvement of living standard, but the requirement for the structural strength of the parking lot is also increasing.
Compared with steel fiber concrete, the steel fiber concrete is a novel multiphase composite material formed by doping short fibers distributed disorderly into concrete, and the steel fibers distributed disorderly can effectively hinder the expansion of micro cracks and the formation of macro cracks in the concrete and obviously improve the characteristics of the concrete such as tensile strength, bending resistance, impact resistance, fatigue resistance and the like; the steel fiber is a widely used one in these years by virtue of good characteristics, the number of vehicles in a parking lot is dense, and the parking lot is required to have bearing capacity with certain strength, so that at present, steel fiber concrete is adopted for pouring in part of the parking lot, and the steel fiber is only added into the common concrete in the existing concrete, but the concrete is easy to generate the phenomena of dusting and the like in the vehicle rolling process, and the phenomena of uneven concrete surface and the like are caused for a long time.
Therefore, the preparation process of the CF50 concrete is used for parking lot construction, and has the advantages of stable structural strength, difficult cracking and difficult dusting.
Disclosure of Invention
The invention aims to provide a preparation process for preparing CF50 concrete which has high structural strength, is not easy to crack and ash.
The technical purpose of the invention is realized by the following technical scheme: a CF50 concrete preparation process comprises the following components by weight:
the gravel comprises 700 parts of large gravel and 250 parts of small gravel, the particle size of the large gravel is 5-25mm, the particle size of the small gravel is 5-10mm, the gravel further comprises an adhesive hardening agent, the adhesive comprises a reagent A and a reagent B, and the reagent A and the reagent B comprise the following components in parts by weight:
reagent A:
and B, reagent:
firstly, spraying the reagent A on the surface of concrete until the reagent A is uniformly dispersed on the concrete, then spraying the reagent B on the surface of a concrete road, and bonding a hardening agent on the surface to form a hard shell after curing and drying; the preparation process of the adhesive comprises the following steps:
step 1.1, preparation of reagent A: pouring nylon powder into tetrahydrofuran solvent, heating to 70-85 deg.C, and stirring for 30-60 min;
step 1.2, preparation of reagent A: adding sodium stearate, and stirring continuously;
step 1.3, preparation of reagent A: pouring water and an emulsifier, and stirring at a high speed to obtain an emulsified suspension;
step 1.4, preparation of reagent B: uniformly mixing sodium fluosilicate and silicon dioxide, pouring into an organic solvent, and continuously stirring;
step 1.5, preparation of reagent B: pouring the light stabilizer and the heat stabilizer into a mixing system in sequence, and continuously stirring;
step 1.6, preparation of reagent B: the silica gel in the gas phase was poured slowly and stirred continuously.
Preferably, zinc oxide is used as the light stabilizer, and sorbitol is used as the heat stabilizer.
Preferably, the organic solvent in the reagent A is tetrahydrofuran, and the organic solvent in the reagent B is one or more of ethanol, propylene glycol and glycerol.
Preferably, the steel fiber comprises 30-36 parts of filament and 8-9 parts of short filament, the length of the filament is 6-8mm, and the length of the short filament is 2-3 mm.
In conclusion, the invention has the following beneficial effects:
(1) the adhesive in the scheme adopts cement, fly ash and micro silica fume, the crushed stone comprises large crushed stone and small crushed stone, the large crushed stone is used as aggregate, the small crushed stone is filled in the large crushed stone and is used for ensuring the structural strength of concrete, the cement, the fly ash and the micro silica fume are all fine powder, the cement, the fly ash and the micro silica fume are mixed with water to form the adhesive, the micro silica fume is used for enhancing the hardness of the concrete, the steel fiber is used for enhancing the toughness of the concrete, the prepared concrete has high structural strength and is not easy to crack and ash, the fiber added in the adhesive forms a fiber net under the combined action of the cement, the fly ash, the micro silica fume and other additives, the gravel aggregate and the like are fixed in the adhesive, and the conditions of cracking, ash and the like in the vehicle pressing;
(2) because the vehicle rolls a certain concrete pavement firstly in the running process, and then after the vehicle leaves, the tire generates upward suction to the concrete pavement in the rapid running process, the internal structure of the concrete pavement is easy to loosen and damage for a long time; the adhesive hardener is sprayed on the surface of the concrete road to enhance the surface evenness of the concrete road, and then the adhesive hardener is sprayed on the surface of the concrete road to cover the surface of the concrete road and harden and agglomerate, so that the phenomena of surface cracking, dusting and the like of the concrete road caused by pressure are relieved;
(3) the steel fibers are dispersed in the concrete system, when the surface of the concrete plate is subjected to larger pressure or the concrete plate has a tendency of cracking due to sunshine insolation, the two ends of the steel fibers are buried at the two ends of the crack, so that the cracking of the concrete plate needs to generate an acting force for tearing the steel fibers, and the acting force required by the cracking of the concrete plate is larger and is not easy to crack;
(4) the adhesive hardener comprises an agent A and an agent B, wherein the agent A is emulsified turbid liquid, the emulsified turbid liquid has large adhesion force but poor permeability, the emulsified turbid liquid is sprayed on the surface of concrete, is accumulated on the surface of the concrete and then permeates downwards until the emulsified turbid liquid is uniformly dispersed on the concrete, the agent B is sprayed and smeared on the surface of a concrete road, and the adhesive hardener forms a hard shell on the surface after being cured and dried, so that the concrete is protected;
(5) dissolving nylon powder in an organic solvent to a large extent, then pouring water and an emulsifier into the mixture, and stirring the mixture at a high speed to form emulsified suspension, wherein the added sodium stearate is a strong base weak acid salt which can be used as a good foaming agent and can act together with the emulsifier to form the emulsified suspension; after the agent A is permeated downwards, the organic solvent in the agent A is evaporated, and the nylon powder is filled in pores and cavities on the surface of the concrete for leveling, so that the agent B is favorably paved on the surface of the concrete, and a flat and smooth surface is formed on the surface of the concrete by the bonding hardener.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, 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 invention.
Example 1:
a CF50 concrete preparation method, including water, cement, fly ash, little silica fume, medium sand, macadam, steel fiber, dispersant and water-reducing agent; the macadam comprises small macadams and large macadams, wherein the particle size of the large macadams is 5-25mm, the particle size of the small macadams is 5-10mm, the steel fibers comprise filament fibers and staple fibers, the length of the filament fibers is about 6-8mm, and the length of the staple fibers is 2-3 mm.
In the embodiment, 160 parts of water, 350 parts of cement, 140 parts of fly ash, 30 parts of micro silica fume, 680 parts of medium sand, 250 parts of small crushed stone and 700 parts of large crushed stone, 30 parts of filament fiber and 8 parts of short filament fiber, 0.5 part of dispersing agent and 9.1 parts of water reducing agent are included.
The concrete road surface after the concrete is poured by the method is also sprayed with an adhesive hardener which comprises a reagent A and a reagent B; the reagent A comprises 50 parts of water, 10 parts of organic solvent, 18 parts of nylon powder, 3 parts of dispersing agent, 3 parts of emulsifying agent and 5 parts of sodium stearate, the reagent B comprises 10 parts of sodium fluosilicate, 6 parts of silicon dioxide, 2 parts of light stabilizer, 2 parts of heat stabilizer, 10 parts of organic solvent and 5 parts of gas-phase silica gel, the heat stabilizer adopts sorbitol, the light stabilizer adopts zinc oxide, the organic solvent in the reagent A adopts tetrahydrofuran, and the organic solvent in the reagent B adopts ethanol, propylene glycol and glycerol.
6-8 hours after the concrete is poured, spraying the reagent A on the surface of the concrete, standing for 2-3 hours, then spraying the reagent B on the surface of the concrete, and standing and maintaining for 28 days.
The preparation process of the adhesive hardener is as follows:
step 1.1, preparation of reagent A: pouring nylon powder into an organic solvent, heating to 70-85 ℃, and stirring for 30-60 min:
step 1.2, preparation of reagent A: adding sodium stearate, and stirring continuously;
step 1.3, preparation of reagent A: pouring water and an emulsifier, and stirring at a high speed to obtain an emulsified suspension;
step 1.4, preparation of reagent B: uniformly mixing sodium fluosilicate and silicon dioxide, pouring into an organic solvent, and continuously stirring;
step 1.5, preparation of reagent B: pouring the light stabilizer and the heat stabilizer into a mixing system in sequence, and continuously stirring;
step 1.6, preparation of reagent B: the silica gel in the gas phase was poured slowly and stirred continuously.
The preparation process of the concrete comprises the following steps:
step 1: preparing an adhesive hardener;
step 2: pouring 10-20 parts of water into a stirrer for wetting;
and step 3: pouring cement, fly ash, micro silica fume, a dispersing agent and a water reducing agent, uniformly mixing, and pouring the rest water;
and 4, step 4: and (3) uniformly mixing the medium sand, the broken stone and the steel fiber, slowly pouring the mixture into the mixing system, and continuously stirring.
The contents of the components in the concrete in examples 2 to 4 were constant, but the contents of the components in the adhesive hardener were varied, and the contents of the components in the concrete were as shown in the following table.
Table 1:
the amounts of the respective material components of the bonding hardener in examples 5 to 7 were the same as those of the bonding hardener in example 1, but the contents of the respective materials in the main components of the concrete were different, as shown in Table 2.
Table 2:
the concrete prepared in examples 1 to 7 and the bonding hardener were cast and cured into concrete panels, and the structural strength and related properties were measured and recorded in table 3.
The comparative example is a concrete slab formed by pouring ordinary silicate concrete.
Wherein, the alkali resistance detection adopts saturated calcium hydroxide solution to spray continuously, and the moisture resistance adopts warm water at 38 ℃ to atomize and then spray continuously for 5 hours.
Finally, the concrete slabs prepared in the embodiments 1 to 7 are subjected to a rolling type fatigue resistance test, the pressure of an automobile on the concrete slabs in the driving process is simulated by using a material for one rise and one fall in the experimental process, and the test result is that the concrete slabs prepared in the comparative examples have cracks in the fatigue resistance test at first; in the process of the second anti-fatigue test, the concrete slab is completely wetted and simulated again; the concrete panels in the comparative examples after the simulation had many dregs falling off, but the CF50 concrete described in the present scheme had no cracking on the surface and no ash falling off.

Claims (4)

1. The preparation process of the CF50 concrete is characterized by comprising the following components in parts by weight:
160 portions of water
350 portions of cement
140 portions of fly ash
30 portions of micro silica fume
680 parts of medium sand
950 portions of macadam
38 portions of steel fiber
0.5 part of dispersant
9.1 parts of water reducing agent
Wherein the macadam comprises 250 parts of small macadam and 700 parts of large macadam, the particle size of the large macadam is 5-25mm, the particle size of the small macadam is 5-10mm, the macadam also comprises an adhesive hardener, the adhesive hardener comprises an A reagent and a B reagent, the A reagent and the B reagent are composed of components according to weight,
reagent A:
50-80 parts of water
10-20 parts of tetrahydrofuran
18-25 parts of nylon powder
3-8 parts of dispersant
3-8 parts of emulsifier
5-10 parts of sodium stearate
And B, reagent:
10-15 parts of sodium fluosilicate
6-10 parts of silicon dioxide
2-5 parts of light stabilizer
2-5 parts of heat stabilizer
10-20 parts of organic solvent
5-20 parts of gas-phase silica gel
Firstly, spraying the reagent A on the surface of concrete until the reagent A is uniformly dispersed on the concrete, then spraying the reagent B on the surface of a concrete road, and bonding a hardening agent on the surface to form a hard shell after curing and drying; the preparation process of the bonding hardener comprises the following steps:
step 1.1, preparation of reagent A: pouring nylon powder into tetrahydrofuran solvent, heating to 70-85 deg.C, and stirring for 30-60 min;
step 1.2, preparation of reagent A: adding sodium stearate, and stirring continuously;
step 1.3, preparation of reagent A: pouring water and an emulsifier, and stirring at a high speed to obtain an emulsified suspension;
step 1.4, preparation of reagent B: uniformly mixing sodium fluosilicate and silicon dioxide, pouring into an organic solvent, and continuously stirring;
step 1.5, preparation of reagent B: pouring the light stabilizer and the heat stabilizer into a mixing system in sequence, and continuously stirring;
step 1.6, preparation of reagent B: the silica gel in the gas phase was poured slowly and stirred continuously.
2. The process for preparing CF50 concrete according to claim 1, wherein: the light stabilizer adopts zinc oxide, and the heat stabilizer adopts sorbitol.
3. The process for preparing CF50 concrete according to claim 1, wherein: the organic solvent in the reagent B is one or more of ethanol, propylene glycol and glycerol.
4. The process for preparing CF50 concrete according to claim 1, wherein: the steel fiber comprises 30-36 parts of filament and 8-9 parts of short filament, wherein the length of the filament is 6-8mm, and the length of the short filament is 2-3 mm.
CN201711498503.6A 2017-12-29 2017-12-29 CF50 concrete preparation process Active CN108129091B (en)

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CN108129091B true CN108129091B (en) 2020-07-03

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160139208A (en) * 2015-05-27 2016-12-07 한국건설기술연구원 Ultra-high performance fiber-reinforced concrete for improving construct ability, and manufacturing method for the same
CN106946520A (en) * 2017-03-06 2017-07-14 武汉大学 A kind of ultra-high performance concrete of the coarse aggregate containing basalt and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160139208A (en) * 2015-05-27 2016-12-07 한국건설기술연구원 Ultra-high performance fiber-reinforced concrete for improving construct ability, and manufacturing method for the same
CN106946520A (en) * 2017-03-06 2017-07-14 武汉大学 A kind of ultra-high performance concrete of the coarse aggregate containing basalt and preparation method thereof

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Denomination of invention: A preparation process of CF50 concrete

Effective date of registration: 20210812

Granted publication date: 20200703

Pledgee: Agricultural Bank of China Co.,Ltd. Chengdu Tianfu New Area Branch

Pledgor: CHENGDU PRECISION CONCRETE Co.,Ltd.

Registration number: Y2021510000182

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