CN109437761B - Preparation method of energy-saving environment-friendly lightweight aggregate concrete - Google Patents
Preparation method of energy-saving environment-friendly lightweight aggregate concrete Download PDFInfo
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- CN109437761B CN109437761B CN201811555657.9A CN201811555657A CN109437761B CN 109437761 B CN109437761 B CN 109437761B CN 201811555657 A CN201811555657 A CN 201811555657A CN 109437761 B CN109437761 B CN 109437761B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/40—Porous or lightweight materials
-
- 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
Abstract
The invention discloses a preparation method of energy-saving and environment-friendly lightweight aggregate concrete, belonging to the technical field of concrete, and the technical scheme is characterized in that the preparation raw materials of the lightweight aggregate concrete comprise the following components in parts by weight: 320 portions of cement, 135 portions of fly ash, 160 portions of ceramic sand, 280 portions of ceramic sand, 690 portions of recycled aggregate, 190 portions of water and 170 portions of water reducing agent and 2-4.5 portions of water reducing agent; the preparation method comprises the following steps: soaking the recycled aggregate in a modification solution for 1-3 hours before mixing with other raw materials, wherein the modification solution comprises the following components in parts by weight: 60-80 parts of water glass with the mass concentration of 5%, 5-10 parts of silane coupling agent, 10-20 parts of organic silicon resin and 5-10 parts of kaolin, and the effect of improving the compressive strength of the lightweight aggregate concrete is achieved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a preparation method of energy-saving and environment-friendly lightweight aggregate concrete.
Background
The lightweight aggregate concrete is prepared from lightweight aggregate, cement, water, an additive and a mineral admixture, and compared with common concrete, the lightweight aggregate concrete solves the problem of heavy dead weight of the common concrete.
In the lightweight aggregate concrete, the aggregate amount is the first and is the largest component in volume and specific gravity. The disordered exploitation of natural sandstone resources caused by the application of aggregates causes damage to mountain vegetation and damage to river channels. The waste concrete construction waste is used as recycled aggregate for development and application, so that the problems that a large amount of waste concrete is difficult to treat and the ecological environment is gradually deteriorated due to the difficulty are solved; on the other hand, the consumption of the building industry on the gravel can be reduced, so that the exploitation of natural gravel is reduced, the problem that the gravel is increasingly deficient and a large amount of gravel is destroyed to the ecological environment is solved, and the living environment of human is protected.
However, the recycled aggregate has a rough surface and a large porosity compared to natural aggregate, and when it is applied to lightweight aggregate concrete, the compressive strength of the cured lightweight aggregate concrete is low.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of energy-saving and environment-friendly lightweight aggregate concrete, so as to achieve the effect of improving the compressive strength of the lightweight aggregate concrete.
The technical purpose of the invention is realized by the following technical scheme:
a preparation method of energy-saving environment-friendly lightweight aggregate concrete,
the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 320 portions of cement, 135 portions of fly ash, 160 portions of ceramic sand, 280 portions of ceramic sand, 690 portions of recycled aggregate, 190 portions of water and 170 portions of water reducing agent and 2-4.5 portions of water reducing agent;
the preparation method comprises the following steps: soaking the recycled aggregate in a modification solution for 1-3 hours before mixing with other raw materials, wherein the modification solution comprises the following components in parts by weight: 60-80 parts of water glass with the mass concentration of 5%, 5-10 parts of silane coupling agent, 10-20 parts of organic silicon resin and 5-10 parts of kaolin.
By adopting the above scheme, firstly, due to the hydrothermal action of cement, a large amount of heat can be released inside the lightweight aggregate concrete in the solidification process, so that the temperature difference between the inside of the lightweight aggregate concrete and the external environment is large, cracking phenomena such as cracks and the like easily occur in the solidification process of the lightweight aggregate concrete mixture, and the compressive strength of the solidified lightweight aggregate concrete is reduced. The preparation raw materials of the invention are reasonable in proportion, and can greatly reduce the hydrothermal action in the solidification process of the lightweight aggregate concrete, thereby reducing the internal and external temperature difference in the solidification process of the lightweight aggregate concrete and improving the compressive strength of the solidified lightweight aggregate concrete.
And secondly, the recycled aggregate generally has higher porosity, so that the recycled aggregate has higher water absorption, and after the recycled aggregate is used in lightweight aggregate concrete, the water absorption is high, so that the cohesiveness of slurry in the lightweight aggregate concrete is poor, the aggregate cannot be wrapped well, and the compressive strength of the lightweight aggregate concrete is poor. According to the invention, the recycled aggregate is soaked in the modification liquid to seal the pores of the recycled aggregate, so that the porosity of the recycled aggregate is reduced, and the compressive strength of the lightweight aggregate concrete is improved.
In conclusion, the lightweight aggregate concrete with high compressive strength is obtained through reasonable proportioning of the preparation raw materials and hole sealing modification treatment on the recycled aggregate.
The invention is further configured to: the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 300 parts of cement, 150 parts of fly ash, 300 parts of ceramic sand, 670 parts of recycled aggregate, 185 parts of water and 2.5 parts of water reducing agent.
By adopting the scheme, the analysis indicates that the proportion of the preparation raw materials of the lightweight aggregate concrete has great influence on reducing the hydrothermal effect in the solidification process and improving the compressive strength of the lightweight aggregate concrete, and tests prove that the compressive strength of the lightweight aggregate concrete obtained by the proportion is the largest, namely the proportion of the preparation raw materials is the most reasonable.
The invention is further configured to: the modified liquid comprises the following components in parts by weight: 70 parts of water glass with the mass concentration of 5%, 8 parts of silane coupling agent, 15 parts of organic silicon resin and 7 parts of kaolin.
By adopting the scheme, experiments prove that after the modifier with the proportion is used for carrying out hole sealing modification treatment on the recycled aggregate, the compressive strength of the finally obtained lightweight aggregate concrete is the largest, which shows that the modifier with the proportion has the most obvious modification effect and the most reasonable proportion.
The invention is further configured to: the particle size of the recycled aggregate is 5-15 mm.
The invention is further configured to: the grain diameter of the ceramsite is 5-25 mm.
The invention is further configured to: the water reducing agent is a polycarboxylic acid water reducing agent.
The invention is further configured to: the cement is P.O42.5.
In conclusion, the invention has the following beneficial effects:
1. the preparation raw materials are reasonable in proportion, and the hydrothermal effect in the solidification process of the lightweight aggregate concrete can be greatly reduced, so that the internal and external temperature difference in the solidification process of the lightweight aggregate concrete is reduced, and the compressive strength of the solidified lightweight aggregate concrete is improved;
2. and secondly, the recycled aggregate has higher porosity so that the recycled aggregate has stronger water absorption, and has large water absorption after being used in the lightweight aggregate concrete.
Detailed Description
The present invention will be described in further detail below.
The grain size of the ceramsite adopted in the following examples is 5-25mm, the water reducing agent is a polycarboxylate water reducing agent, the cement is P.O42.5, the grain size range of the recycled aggregate is 5-15mm, the water absorption rate is 11.2%, and the apparent density is 2308 kg.m-3。
Example 1
A preparation method of energy-saving environment-friendly lightweight aggregate concrete,
the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 280 parts of cement, 135 parts of fly ash, 280 parts of ceramic sand, 655 parts of recycled aggregate, 170 parts of water and 2 parts of water reducing agent;
the preparation method comprises the following steps: the recycled aggregate is soaked in a modification solution for 1h before being mixed with other raw materials, and the modification solution comprises the following components in parts by weight: 60 parts of water glass with the mass concentration of 5%, 5 parts of silane coupling agent, 10 parts of organic silicon resin and 5 parts of kaolin.
Example 2
A preparation method of energy-saving environment-friendly lightweight aggregate concrete,
the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 300 parts of cement, 150 parts of fly ash, 300 parts of ceramic sand, 670 parts of recycled aggregate, 185 parts of water and 2.5 parts of a water reducing agent;
the preparation method comprises the following steps: the recycled aggregate is soaked in a modification solution for 2 hours before being mixed with other raw materials, and the modification solution comprises the following components in parts by weight: 70 parts of water glass with the mass concentration of 5%, 8 parts of silane coupling agent, 15 parts of organic silicon resin and 7 parts of kaolin.
Example 3
A preparation method of energy-saving environment-friendly lightweight aggregate concrete,
the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 160 parts of fly ash, 320 parts of ceramic sand, 690 parts of recycled aggregate, 190 parts of water and 4.5 parts of a water reducing agent;
the preparation method comprises the following steps: the recycled aggregate is soaked in a modification solution for 3 hours before being mixed with other raw materials, and the modification solution comprises the following components in parts by weight: 80 parts of water glass with the mass concentration of 5%, 10 parts of silane coupling agent, 20 parts of organic silicon resin and 10 parts of kaolin.
Example 4
The preparation method of the energy-saving environment-friendly lightweight aggregate concrete is carried out according to the method of the embodiment 2, and is characterized in that: the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 280 parts of cement, 135 parts of fly ash, 280 parts of ceramic sand, 655 parts of recycled aggregate, 170 parts of water and 2 parts of water reducing agent.
Example 5
The preparation method of the energy-saving environment-friendly lightweight aggregate concrete is carried out according to the method of the embodiment 2, and is characterized in that: the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 320 parts of cement, 160 parts of fly ash, 320 parts of ceramic sand, 690 parts of recycled aggregate, 190 parts of water and 4.5 parts of water reducing agent.
Example 6
The preparation method of the energy-saving environment-friendly lightweight aggregate concrete is carried out according to the method of the embodiment 2, and is characterized in that: the recycled aggregate is soaked in a modification solution for 1h before being mixed with other raw materials, and the modification solution comprises the following components in parts by weight: 60 parts of water glass with the mass concentration of 5%, 5 parts of silane coupling agent, 10 parts of organic silicon resin and 5 parts of kaolin.
Example 7
The preparation method of the energy-saving environment-friendly lightweight aggregate concrete is carried out according to the method of the embodiment 2, and is characterized in that: the recycled aggregate is soaked in a modification solution for 3 hours before being mixed with other raw materials, and the modification solution comprises the following components in parts by weight: 80 parts of water glass with the mass concentration of 5%, 10 parts of silane coupling agent, 20 parts of organic silicon resin and 10 parts of kaolin.
Comparative example 1
The preparation method of the energy-saving environment-friendly lightweight aggregate concrete is carried out according to the method of the embodiment 2, and is characterized in that: the recycled aggregate is not subjected to soaking modification treatment, and is directly mixed with other preparation raw materials and stirred.
Performance detection
The 28d compressive strength of the lightweight aggregate concrete prepared in examples 1 to 7 and comparative example 1 was measured, and the results are shown in table 1.
TABLE 1 compressive Strength test results of lightweight aggregate concrete
According to table 1, it can be seen from examples 2, 4 and 5 that the blending ratio of the raw materials for preparation has a greater influence on the compressive performance of the lightweight aggregate concrete, wherein the compressive strength of the lightweight aggregate concrete prepared in example 2 is the greatest, which means that the blending ratio of the raw materials for preparation in example 2 is most reasonable. This is because, due to the hydrothermal effect of cement, a large amount of heat is released inside the lightweight aggregate concrete during the solidification process, which causes a large temperature difference between the inside of the lightweight aggregate concrete and the external environment, so that cracking phenomena such as cracks are likely to occur in the lightweight aggregate concrete mixture during the solidification process, thereby reducing the compressive strength of the lightweight aggregate concrete after solidification. The preparation raw materials of the invention are reasonable in proportion, and can greatly reduce the hydrothermal action in the solidification process of the lightweight aggregate concrete, thereby reducing the internal and external temperature difference in the solidification process of the lightweight aggregate concrete and improving the compressive strength of the solidified lightweight aggregate concrete.
The compressive strength of the lightweight aggregate concrete prepared in examples 1 to 7 is greatly improved compared with that of the lightweight aggregate concrete prepared in comparative example 1, which shows that the compressive strength of the lightweight aggregate concrete can be effectively improved by the modification treatment of the recycled aggregate. The recycled aggregate generally has higher porosity, so that the recycled aggregate has higher water absorption, and after the recycled aggregate is used in lightweight aggregate concrete, the water absorption is high, so that the cohesiveness of slurry in the lightweight aggregate concrete is poor, the aggregate cannot be wrapped well, and the compressive strength of the lightweight aggregate concrete is poor. It can be seen from the comparison of examples 2, 6 and 7 that the proportion of the modifier in the invention has a great influence on the compressive strength of the lightweight aggregate concrete, wherein, in example 2, the proportion of the modifier has a great influence on the compressive strength of the lightweight aggregate concrete
The proportion of the modifier is most reasonable.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (7)
1. A preparation method of energy-saving and environment-friendly lightweight aggregate concrete, which is characterized in that,
the lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 320 portions of cement, 135 portions of fly ash, 160 portions of ceramic sand, 280 portions of ceramic sand, 690 portions of recycled aggregate, 190 portions of water and 170 portions of water reducing agent and 2-4.5 portions of water reducing agent;
the preparation method comprises the following steps: the recycled aggregate is soaked in a modification liquid for 1-3 hours before being mixed with other raw materials, and the modification liquid comprises the following components in parts by weight: 60-80 parts of water glass with the mass concentration of 5%, 5-10 parts of silane coupling agent, 10-20 parts of organic silicon resin and 5-10 parts of kaolin.
2. The preparation method of the energy-saving and environment-friendly lightweight aggregate concrete according to claim 1, characterized in that the preparation raw materials of the lightweight aggregate concrete comprise the following components in parts by weight: 300 parts of cement, 150 parts of fly ash, 300 parts of ceramic sand, 670 parts of recycled aggregate, 185 parts of water and 2.5 parts of water reducing agent.
3. The preparation method of the energy-saving environment-friendly lightweight aggregate concrete according to claim 1, characterized in that the modifying solution comprises the following components in parts by weight: 70 parts of water glass with the mass concentration of 5%, 8 parts of silane coupling agent, 15 parts of organic silicon resin and 7 parts of kaolin.
4. The preparation method of the energy-saving environment-friendly lightweight aggregate concrete according to claim 1, characterized by comprising the following steps: the particle size of the recycled aggregate is 5-15 mm.
5. The preparation method of the energy-saving environment-friendly lightweight aggregate concrete according to claim 1, characterized by comprising the following steps: the particle size of the ceramic sand is 5-25 mm.
6. The preparation method of the energy-saving environment-friendly lightweight aggregate concrete according to claim 1, characterized by comprising the following steps: the water reducing agent is a polycarboxylic acid water reducing agent.
7. The preparation method of the energy-saving environment-friendly lightweight aggregate concrete according to claim 1, characterized by comprising the following steps: the cement is P.O42.5.
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| CN110066152A (en) * | 2019-04-10 | 2019-07-30 | 江苏城工建设科技有限公司 | A kind of high resistivity regeneration concrete and preparation method thereof |
| CN112010602A (en) * | 2020-08-18 | 2020-12-01 | 湖州上建混凝土有限公司 | High-strength recycled aggregate concrete and preparation method thereof |
| CN112123568B (en) * | 2020-09-21 | 2021-11-26 | 淮北辰威科技有限公司 | Production process of concrete |
| CN113185199A (en) * | 2021-05-17 | 2021-07-30 | 四川统揽建设集团有限公司 | Cement stabilizing material and preparation method thereof |
| CN115477513B (en) * | 2022-09-14 | 2023-08-04 | 重庆中吉达环保科技有限公司 | High-strength lightweight aggregate concrete and preparation method thereof |
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