CN112110685A - LC40 lightweight aggregate concrete and preparation method thereof - Google Patents
LC40 lightweight aggregate concrete and preparation method thereof Download PDFInfo
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- CN112110685A CN112110685A CN202010919916.2A CN202010919916A CN112110685A CN 112110685 A CN112110685 A CN 112110685A CN 202010919916 A CN202010919916 A CN 202010919916A CN 112110685 A CN112110685 A CN 112110685A
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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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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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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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses LC40 lightweight aggregate concrete belongs to the concrete preparation field, and its technical essential is: the LC40 lightweight aggregate concrete comprises the following components in parts by weight: shale ceramsite: 900 portion and 1160 portion; fine sand: 600-780 parts; cement: 310-380 parts; water reducing agent: 8.5-10.2 parts of mineral admixture: 230-285 parts; 135 portions and 165 portions of water. By the scheme, the shale ceramsite is rougher, has larger surface area and stronger water absorption capacity, so that the bonding capacity is stronger when the shale ceramsite is combined with cementing materials such as cement, and the shale ceramsite is stably connected with other surrounding cementing materials and fine sand, so that the compressive strength of the formed concrete is improved, and the compressive load-bearing effect of the finally obtained lightweight aggregate concrete is effectively improved.
Description
Technical Field
The application relates to the technical field of concrete preparation, in particular to LC40 lightweight aggregate concrete.
Background
LC concrete is also called lightweight aggregate concrete, and the concrete prepared by lightweight coarse aggregate and lightweight fine aggregate is widely applied to industrial and civil buildings and other projects, and can reduce the self weight of the structure; the anti-seismic performance of the structure is improved; the material consumption is saved; the component transportation and hoisting efficiency is improved; reducing foundation load and improving building functions (heat preservation, heat insulation, fire resistance and the like).
However, for lightweight aggregate concrete, there is a large contradiction between the thermal insulation performance and the strength of the lightweight aggregate concrete, and since the strength depends on the density of the lightweight concrete, the higher the density and the larger the self weight are, the higher the strength is, but when the density is higher, the higher the heat conductivity coefficient is, the thermal insulation effect of the lightweight concrete cannot be guaranteed, and under such a problem, the strength of most lightweight concrete is lower, and the lightweight concrete cannot be effectively used in a building structure which needs to be supported strongly, and needs to be further improved.
Disclosure of Invention
In order to realize relatively high strength of the LC lightweight aggregate concrete, the application provides the LC40 lightweight aggregate concrete and a preparation method thereof.
The application is realized by the following technical scheme:
in a first aspect, the application provides an LC40 lightweight aggregate concrete, which adopts the following technical scheme:
the LC40 lightweight aggregate concrete comprises the following components in parts by weight: shale ceramsite: 900 portion and 1160 portion; fine sand: 600-780 parts; cement: 310-380 parts; water reducing agent: 8.5-10.2 parts; mineral admixture: 230-285 parts; 135 portions and 165 portions of water.
By adopting the technical scheme and combining performance detection data, the shale ceramsite can be used as concrete aggregate, so that the compressive strength of finally prepared concrete can be effectively improved. The shale ceramsite is coarser, so that the shale ceramsite has larger surface area and stronger water absorption capacity, the bonding capacity is stronger when the shale ceramsite is combined with cementing materials such as cement, the shale ceramsite distributed in the coarse aggregate is stably connected with other shale ceramsite around the shale ceramsite, the compression resistance and bearing capacity of the formed concrete are improved, and the LC40 lightweight aggregate concrete can be effectively applied to building structures.
Further setting the following steps: the shale ceramsite is crushed stone type shale ceramsite.
By adopting the technical scheme and combining the performance detection data of the embodiment 3 and the embodiment 7, the compressive strength of the finally prepared LC40 lightweight aggregate concrete can be effectively improved when the adopted shale ceramisite is the gravel type shale ceramisite. The result is that the single particle of the crushed stone type shale ceramsite has larger surface area and water absorption capacity than the conventional shale ceramsite, and the holes on the crushed stone type shale ceramsite are mostly of triangular structures, so that the crushed stone type shale ceramsite particles have higher strength, and finally, after the crushed stone type shale ceramsite particles are bonded with other shale ceramsite by combining a cementing material, the obtained concrete has larger compressive strength.
Further setting the following steps: the particle size of the shale ceramsite is 5-10 mm.
By adopting the technical scheme, the shale ceramisite with smaller particle size can be used as auxiliary aggregate to be distributed among the shale ceramisites with larger particle size, so that the compressive strength of the concrete is improved while the cost is controlled.
Further setting the following steps: the shale ceramsite adopts continuous gradation.
By adopting the technical scheme and combining the performance detection data of the embodiment 3 and the embodiment 8, the compressive strength of the finally prepared LC40 lightweight aggregate concrete can be effectively improved when the shale ceramisite and the shale ceramisite are in continuous grade. The result is that the gaps among the continuously graded aggregate particles are smaller than those among the discontinuously graded aggregate particles, and finally the prepared concrete aggregate particles are relatively tighter, so that the concrete aggregate particles have better connection strength and better pressure resistance.
Further setting the following steps: the mineral admixture comprises the following components in parts by weight: 80-100 parts of fly ash; 110 portions and 130 portions of mineral powder; 40-55 parts of silica fume.
By adopting the technical scheme, the addition of the fly ash can achieve the effect of reducing the cement dosage, the spherical glass body contained in the fly ash can effectively reduce the yield shear stress of the mixture, and further the mixture has larger fluidity, the mineral powder can achieve the effects of reducing the cement dosage and reducing the adiabatic temperature rise, meanwhile, the construction performance of the concrete can be effectively improved, and the later strength of the concrete and the durability of resisting sulfate corrosion, chloride dialysis and the like are improved.
Further setting the following steps: the solid content of the adopted polycarboxylic acid water reducing agent is 20 percent, and the water reducing rate is more than 30 percent.
By adopting the technical scheme, the high-efficiency water reducing agent is selected to further improve the fluidity of the prepared concrete, so that the pumping performance of the concrete in the subsequent working process is ensured.
In a second aspect, the application provides a preparation method of an LC40 lightweight aggregate concrete, which adopts the following technical scheme: a preparation method of LC40 lightweight aggregate concrete comprises the following steps:
s1: putting cement, mineral admixture, shale ceramsite, water reducer and pervious concrete reinforcing agent into a concrete mixer for stirring to obtain a primary mixed material;
s2: and (3) putting the shale ceramisite into the primary mixed material obtained in the step S1, and stirring to obtain the LC40 lightweight aggregate concrete.
Further setting the following steps: step S1 includes the following steps:
s 1: the cement, the mineral admixture and the shale ceramsite are dry-mixed in a concrete mixer and uniformly stirred to obtain a primary mixed dry material; s 2: and (4) adding 80% of the required water into the primary mixed dry material obtained in the step s1, uniformly stirring, adding the water reducing agent, the permeable concrete reinforcing agent and the rest 20% of water without stopping the concrete mixer after stirring, continuously stirring after adding, and uniformly stirring to form the primary mixed material.
By adopting the technical scheme and combining the performance detection data of the embodiment 3 and the comparative example 2, the LC40 lightweight aggregate concrete prepared by the step has better compressive strength. The result is that the shale ceramisite, the mineral admixture and the cement are firstly stirred, so that the cementing material is fully attached to the shale ceramisite, different particles can be bonded by means of the shale ceramisite after the shale ceramisite is subsequently added, the particles in the coarse aggregate are better connected, and the concrete aggregate prepared by the method has stronger connection relationship, so that the concrete aggregate has higher compressive strength.
To sum up, the beneficial technical effect of this application does:
(1) the high adhesiveness of the shale ceramisite is utilized to stably bond the cementing material and each particle, so that the LC40 lightweight aggregate concrete is finally formed and has stronger structural strength.
(2) The shale ceramisite is broken stone type shale ceramisite with more excellent strength and larger surface area, so that the bonding effect among aggregates and the overall strength of the bonded concrete are further enhanced;
(3) the shale ceramsite, the cementing material and the like are stirred firstly, so that the shale ceramsite is fully bonded with the cementing material, the bonding relation between two kinds of aggregates after being contacted is further enhanced, and the structural strength of the concrete is finally improved.
Detailed Description
Example 1
The LC40 lightweight aggregate concrete disclosed by the embodiment of the application comprises shale ceramsite, fine sand, cement, a water reducing agent, a mineral admixture and water, wherein the shale ceramsite is crushed stone type shale ceramsite; the mineral admixture comprises fly ash, mineral powder and silica fume, and the specific parts by weight of the components are detailed in table 1.
In addition, the shale ceramisite is continuously graded, and the particle size of the shale ceramisite is 5-10 mm. The solid content of the adopted water reducing agent is 20 percent, and the water reducing rate is more than 30 percent.
The preparation method of the LC40 lightweight aggregate concrete comprises the following steps:
s1: putting cement, mineral admixture, shale ceramsite, water and water reducing agent into a concrete mixer for stirring to obtain a primary mixed material;
s2: and (3) putting the shale ceramisite into the primary mixed material obtained in the step S1, and stirring to obtain the LC40 lightweight aggregate concrete.
Wherein, the process of S1 includes the following steps:
s 1: the cement, the mineral admixture and the shale ceramsite are dry-mixed in a concrete mixer and uniformly stirred to obtain a primary mixed dry material;
s 2: and (4) adding 80% of the required water into the primary mixed dry material obtained in the step s1, uniformly stirring, adding the water reducing agent, the permeable concrete reinforcing agent and the rest 20% of water without stopping the concrete mixer after stirring, continuously stirring after adding, and uniformly stirring to form the primary mixed material.
Examples 2 to 6
The difference from example 1 is that the weight parts of each component are different, and the detailed numerical values are shown in Table 1.
Example 7
The difference from example 3 is that the shale ceramisite used in this example is a conventional shale ceramisite that is not a crushed stone type shale ceramisite.
Example 8
The difference from example 3 is that the shale ceramisite and the shale ceramisite used in this example are both prepared by using discontinuous gradation.
Comparative example 1
The difference from example 3 is that the shale ceramisite is replaced by crushed stone particles in this example.
Comparative example 2
The difference from example 3 is that the preparation method of the LC40 lightweight aggregate concrete in this example includes the following steps:
s1, putting the cement, the mineral admixture, the shale ceramsite and the fine sand into a concrete mixer together for dry mixing, and uniformly mixing to obtain a mixed material;
and S2, adding a water reducing agent and required water into the mixture obtained in the step S1, and uniformly stirring without stopping a concrete mixer in the water adding process to obtain the all-light concrete.
Table 1: LC40 lightweight aggregate concrete each component weight part number is shown schematically
Performance detection test:
the concrete samples obtained in the examples and comparative examples were subjected to a compressive strength test, wherein the concrete samples were cubes of 15cm × 15cm × 15cm, three in each set, and cured by a standard method (temperature 20 ℃ ± 2 ℃, relative humidity 95% RH or more) after molding. The resulting performance results are shown in table 2.
Table 2: and (5) a compression strength performance detection data table.
And (4) analyzing results:
the combination of performance test data shows that the LC40 lightweight aggregate concrete prepared by selecting the shale ceramisite as the coarse aggregate has better compressive strength, particularly, under the component proportion of the embodiment 3, the compressive strength at 28d can reach the grade of C45-C50 strength concrete, the support in the structure can be fully realized, and meanwhile, the shale ceramisite has smaller density, so that the whole volume weight of the prepared concrete is smaller. The result is that the shale ceramisite has a rougher surface, and particularly the crushed stone type shale ceramisite has a larger surface area, so that the concrete has stronger water absorption capacity during manufacturing, the bonding capacity is stronger when the shale ceramisite is combined with cementing materials such as cement, the shale ceramisite is stably connected with fine sand aggregates around the shale ceramisite, and the compressive strength of the coarse aggregates after forming the concrete is finally improved.
By combining the performance test data of the embodiments 3 and 7, it can be seen that the compressive strength of the finally prepared concrete can be effectively improved when the adopted shale ceramisite is the crushed stone type shale ceramisite under the condition that other components and the preparation method are not changed. The result is that the single particle of the crushed stone type shale ceramsite has larger surface area and water absorption capacity than the conventional shale ceramsite, and the holes on the crushed stone type shale ceramsite are mostly of triangular structures, so that the crushed stone type shale ceramsite particles have higher strength, and finally, after the crushed stone type shale ceramsite particles are bonded with other shale ceramsite by combining a cementing material, the obtained concrete has larger compressive strength.
The performance test data of the embodiments 3 and 8 show that the compressive strength of the finally prepared concrete can be effectively improved by continuously proportioning the shale ceramisite under the condition of keeping the components and the preparation method unchanged. The result is that the gaps among the continuously graded aggregate particles are smaller than those among the discontinuously graded aggregate particles, and finally the prepared concrete aggregate particles are relatively tighter, so that the concrete aggregate particles have better connection strength and better pressure resistance.
Combining the performance test data of example 3 and comparative example 2, it can be seen that the concrete prepared by the procedure of example 3 has better compressive strength while the components are kept unchanged. Compared with the conventional preparation method of mixing all the materials in the comparative example 2, the shale ceramsite, the mineral admixture and the cement are firstly mixed in the example 3, so that the cementing material is fully attached to the shale ceramsite, different particles can be bonded by means of the shale ceramsite after the shale ceramsite is subsequently added, the better connection among particles in the concrete is realized, and the concrete aggregate prepared by the method has stronger connection relation and higher compressive strength.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. An LC40 lightweight aggregate concrete, which is characterized in that: the composition comprises the following components in parts by weight:
shale ceramsite: 900 portion and 1160 portion;
sand: 600-780 parts;
cement: 310-380 parts;
polycarboxylic acid water reducing agent: 8.5-10.2 parts;
mineral admixture: 230-285 parts;
135 portions and 165 portions of water.
2. The LC40 lightweight aggregate concrete according to claim 1, wherein: the shale ceramsite is crushed stone type shale ceramsite.
3. The LC40 lightweight aggregate concrete according to claim 1, wherein: the particle size of the shale ceramsite is 5-10 mm.
4. The LC40 lightweight aggregate concrete according to claim 1, wherein: the shale ceramsite adopts continuous gradation.
5. The LC40 lightweight aggregate concrete according to claim 1, wherein: the mineral admixture comprises the following components in parts by weight:
80-100 parts of fly ash;
110 portions and 130 portions of mineral powder;
40-55 parts of silica fume.
6. The LC40 lightweight aggregate concrete according to claim 1, wherein: the solid content of the adopted polycarboxylic acid water reducing agent is 20 percent, and the water reducing rate is more than 30 percent.
7. The method for preparing LC40 lightweight aggregate concrete according to any one of claims 1-6, which comprises the following steps:
s1: putting cement, mineral admixture, shale ceramsite, water and polycarboxylic acid water reducing agent into a concrete mixer for stirring to obtain a primary mixed material;
s2: and (4) putting the fine sand into the primary mixed material obtained in the step S1, and stirring to obtain the all-light concrete.
8. An LC40 lightweight aggregate concrete according to claim 7, wherein: step S1 includes the following steps:
s 1: the cement, the mineral admixture and the shale ceramsite are dry-mixed in a concrete mixer and uniformly stirred to obtain a primary mixed dry material;
s 2: and (4) adding 80% of the required water into the primary mixed dry material obtained in s1, uniformly stirring, adding the polycarboxylic acid water reducing agent and the residual 20% of water without stopping the concrete mixer after stirring, continuously stirring after adding, and uniformly stirring to form the primary mixed material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003049A (en) * | 2022-12-05 | 2023-04-25 | 西北民族大学 | Ceramsite lightweight aggregate concrete for structure |
| CN116283349A (en) * | 2023-03-23 | 2023-06-23 | 湖南华信陶粒科技有限公司 | Shale ceramsite concrete and preparation method thereof |
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| CN104291758A (en) * | 2014-10-16 | 2015-01-21 | 成都建工成新混凝土工程有限公司 | Preparation method of structural lightweight aggregate concrete |
| CN107021678A (en) * | 2016-08-12 | 2017-08-08 | 儋州宇顺实业有限公司 | The formula and electric pole preparation method of a kind of non-evaporating curing concrete of light high performance |
| CN108264299A (en) * | 2018-04-04 | 2018-07-10 | 重庆建工建材物流有限公司 | A kind of pump structure haydite concrete of high stability and preparation method thereof |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101747006A (en) * | 2009-12-28 | 2010-06-23 | 宁波大学 | High-performance lightweight aggregate concrete |
| CN104291758A (en) * | 2014-10-16 | 2015-01-21 | 成都建工成新混凝土工程有限公司 | Preparation method of structural lightweight aggregate concrete |
| CN107021678A (en) * | 2016-08-12 | 2017-08-08 | 儋州宇顺实业有限公司 | The formula and electric pole preparation method of a kind of non-evaporating curing concrete of light high performance |
| CN108264299A (en) * | 2018-04-04 | 2018-07-10 | 重庆建工建材物流有限公司 | A kind of pump structure haydite concrete of high stability and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003049A (en) * | 2022-12-05 | 2023-04-25 | 西北民族大学 | Ceramsite lightweight aggregate concrete for structure |
| CN116283349A (en) * | 2023-03-23 | 2023-06-23 | 湖南华信陶粒科技有限公司 | Shale ceramsite concrete and preparation method thereof |
| CN116283349B (en) * | 2023-03-23 | 2024-05-24 | 湖南华信陶粒科技有限公司 | Shale ceramsite concrete and preparation method thereof |
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Application publication date: 20201222 |