CN102745971B - Low-alkalinity ecological concrete and preparation method thereof - Google Patents
Low-alkalinity ecological concrete and preparation method thereof Download PDFInfo
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- CN102745971B CN102745971B CN 201210247808 CN201210247808A CN102745971B CN 102745971 B CN102745971 B CN 102745971B CN 201210247808 CN201210247808 CN 201210247808 CN 201210247808 A CN201210247808 A CN 201210247808A CN 102745971 B CN102745971 B CN 102745971B
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Abstract
The invention provides low-alkalinity ecological concrete and a preparation method thereof. The low-alkalinity ecological concrete is made of, by weight, 74.9-84.7 parts of gravels, 11.2-16.3 parts of low-alkalinity cementing materials, 1.9-3.26 parts of water, 0.09-0.17 part of water reducing agent and 0.04-0.09 part of coagulation regulating materials. Slurry precipitation is avoided by using the slurry wrapping method for preparation. The low-alkalinity cementing materials are less prone to generate free Ca(OH)2 after hydration, and the interior alkalinity of the concrete can be lowered (pH value is lower than 9.8) without damaging concrete strength, so that a favorable growing environment for plant root systems in ecological concrete can be guaranteed.
Description
Technical field
The present invention relates to a kind of preparation method of low alkalinity ecological concrete of suitable plant normal growth, belong to the environment-friendly building materials field.
Technical background
In recent years China's Economic development is swift and violent, and the capital constructions such as highway, railway, dykes and dams are maked rapid progress, and have destroyed original landforms and vegetation cover in the construction process of these capital constructions, and have produced a large amount of secondary barrens, soil erosion.Urban ground is waterproof by one deck, air-locked concrete wraps up, the tropical island effect aggravation, and the Urban Underground water level descends year by year.Reservoir, rivers and creeks shore protection adopt cast in situs or precast concrete more, cause water body and terrestrial environment to worsen, and reduce the water body diversity of organism.Therefore, the low alkalinity ecological concrete that exploitation can be planted living operation singly is not of value to the environment that to protect mankind is depended on for existence, has significant economic and social benefit yet.
At present, eco-concrete is mainly used in reinforcing and the engineerings such as green side slope, river levee shore protection in countries and regions such as Japan, US and Europeans.Domestic correlative study starting is evening relatively, mainly concentrates on a difficult problem that solves the inner basicity higher (about pH=13) of normal concrete and can't satisfy the root system of plant normal growth.Mainly adopt nature carborization and envelope alkaline process for reducing basicity at present, but the former has destroyed the microtexture of cement inside, causes the mechanical performance of concrete decrease; The macromolecular compound strong toxicity that the latter is used easily decomposes under the high temperature, and construction cost is high.The two is neither fundamentally to overcome the too high shortcoming of the inner basicity of eco-concrete.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of low alkalinity ecological concrete, the preparation method of this low alkalinity ecological concrete is provided simultaneously.Inside basicity, porosity and the pore size distribution of this low alkalinity ecological concrete all can satisfy the requirement of plant-growth.
Technical scheme of the present invention is as follows:
A kind of low alkalinity ecological concrete is prepared from by the raw material of following weight part:
Stone 74.9～84.7
Low alkalinity gel material 11.2～16.3
Water 1.9～3.26
Water reducer 0.09～0.17
Transfer gel material 0.04 ~ 0.09
Described low alkalinity gel material is prepared from by the raw material of following weight part:
Sulphoaluminate cement clinker 50.0～80.0
Anhydrite 20.0～50.0
Or
Sulphoaluminate cement clinker 40.0～60.0
Anhydrite 15.0～40.0
Flyash 5.0～25.0
Described accent gel material is boric acid class material; The pH value of described low alkalinity ecological concrete low alkalinity ecological concrete is less than 9.8.
Further, described sulphoaluminate cement clinker comprises the mineral composition of following quality percentage composition: C
4A
3S 36.0 ~ 52.8%, C
2S 23.0 ~ 32.0%, iron phase 8.0 ~ 21.0%; Described water reducer is polycarboxylate water-reducer; Described stone is the Wingdale rubble of particle diameter between 9.5～19.5mm.
The preparation method of a kind of low alkalinity ecological concrete provided by the present invention may further comprise the steps:
1) takes by weighing sulphoaluminate cement clinker and anhydrite or sulphoaluminate cement clinker, anhydrite and flyash by proportioning, mix in the adding mixer, get low alkalinity gel material;
2) get 45 ~ 60% of the water yield in the proportioning, add and transfer gel material, dissolving, add again stone, insert and stir 25 ~ 45s in the stirrer, add subsequently 40 ~ 55% of low alkalinity gel material total amount, stir 45 ~ 65s, add again remaining low alkalinity gel material, water and water reducer, stir 105 ~ 135s; Get and newly mix low alkalinity ecological concrete;
3) newly mix low alkalinity ecological concrete and divide three layers to join in the mould, every layer with φ 16mm tamper tamping 20 times, vibrates 6 ~ 10s at shaking table, then applies the pressure of 0.01～0.1MPa, and get final product.
The low alkalinity ecological concrete that the present invention relates to is that a kind of pH value is lower than 9.8, the environment-friendly type building material of plant normal growth in its hole.Root system of plant absorbs the nutrition on the nutrition base in the hole, passes the low alkalinity ecological concrete hole and is deep in the soil, has guaranteed the further growth of plant, and greening and capital construction are perfectly combined, and increases the vert space in city, joyful people's mood.
Low alkalinity gel material involved in the present invention has reduced inside concrete basicity effectively, has fully guaranteed the demand of plant normal growth.
Beneficial effect of the present invention is:
(1) preparation method is simple, processing ease, and construction cost is low;
(2) be difficult for producing free Ca (OH) after the low alkalinity gel material aquation
2, can under the prerequisite of not damaging concrete strength, reduce the basicity (the pH value is lower than 9.8) of inside concrete, guaranteed the good growing environment of the inner root system of plant of eco-concrete;
(3) moulding of slurry method is wrapped up in employing, has avoided the generation of heavy slurry phenomenon, for root system of plant develops the space that provides enough in eco-concrete.
Embodiment
The present invention is described further below in conjunction with embodiment.
Embodiment 1
1) preparation of low alkalinity gel material: get sulphoaluminate cement clinker 184.63Kg and admant 123.09Kg mixing.
The clean slurry of test experimental data is: the pH value of 28d is 9.53; It is 70.7MPa that 28d starches ultimate compression strength only.
2) preparation low alkalinity ecological concrete: get particle diameter and be the water of stone 1538.60 Kg, 36.93 Kg of 9.5mm～19mm and boric acid 1.23 Kg and add in the stirrer and stir 27s, the low alkalinity gel material that adds subsequently 153.86 Kg stirs 58s, the poly carboxylic acid that adds at last remaining 153.86Kg low alkalinity gel material, 24.62 Kg water and 3.08 Kg stirs 124s.Then fresh concrete is divided three layers and join in the mould, every layer with the tamper tamping of φ 16mm 20 times, vibrates 6s at shaking table, then applies the pressure of 0.06MPa.
The data of test are as follows: the pH value of low alkalinity ecological concrete 28d is 9.23; 28d ultimate compression strength is 13.4MPa; Porosity is 30.10%; The open pore rate is 26.80%; Effective radius 1.6mm.
Embodiment 2
1) preparation of low alkalinity gel material: get sulphoaluminate cement clinker 223.80Kg and anhydrite 55.95Kg mixing.
The clean slurry of test experimental data is: the pH value of 28d is 9.91; It is 103.3MPa that 28d starches ultimate compression strength only.。
2) preparation low alkalinity ecological concrete: get particle diameter and be the water of stone 1538.60 Kg, 33.57 Kg of 9.5mm～19mm and boric acid 1.12 Kg and add in the stirrer and stir 27s, the low alkalinity gel material that adds subsequently 139.87 Kg stirs 58s, the poly carboxylic acid that adds at last remaining 139.87Kg low alkalinity gel material, 22.38 Kg water and 2.80 Kg stirs 124s.Then fresh concrete is divided three layers and join in the mould, every layer with the tamper tamping of φ 16mm 20 times, vibrates 6s at shaking table, then applies the pressure of 0.08MPa.
Data after the test are as follows: the pH value of low alkalinity ecological concrete 28d is 9.67; 28d ultimate compression strength is 12.1MPa; Porosity is 31.00%; The open pore rate is 28.40%; Effective radius 1.9mm.
Embodiment 3
1) preparation of low alkalinity gel material: get sulphoaluminate cement clinker 128.22Kg, anhydrite 89.75Kg and flyash 38.47 Kg mixings.
The clean slurry of test experimental data is: the pH value of 28d is 9.68; It is 95.6MPa that 28d starches ultimate compression strength only.
2) preparation low alkalinity ecological concrete: get particle diameter and be the water of stone 1538.60 Kg, 30.77 Kg of 9.5mm～19mm and boric acid 1.03 Kg and add in the stirrer and stir 27s, the low alkalinity gel material that adds subsequently 128.22 Kg stirs 58s, the poly carboxylic acid that adds at last remaining 128.22Kg low alkalinity gel material, 20.51 Kg water and 2.56 Kg stirs 124s.Then fresh concrete is divided three layers and join in the mould, every layer with the tamper tamping of φ 16mm 20 times, vibrates 6s at shaking table, then applies the pressure of 0.05MPa.
Data after the test are as follows: the pH value of low alkalinity ecological concrete 28d is 9.27; 28d ultimate compression strength is 9.20MPa; Porosity is 32.90%; The open pore rate is 29.20%; The effective pore radius is 2.4mm.
Claims (3)
1. a low alkalinity ecological concrete is characterized in that, is prepared from by the raw material of following weight part:
Stone 74.9～84.7
Low alkalinity gel material 11.2～16.3
Water 1.9～3.26
Water reducer 0.09～0.17
Transfer gel material 0.04 ~ 0.09
Described low alkalinity gel material is prepared from by the raw material of following weight part:
Sulphoaluminate cement clinker 50.0～80.0
Anhydrite 20.0～50.0
Or
Sulphoaluminate cement clinker 40.0～60.0
Anhydrite 15.0～40.0
Flyash 5.0～25.0
Described accent gel material is boric acid class material;
The pH value of described low alkalinity ecological concrete is less than 9.8,
Described stone is the Wingdale rubble of particle diameter between 9.5～19.5mm,
The preparation method of described low alkalinity ecological concrete may further comprise the steps:
1) takes by weighing sulphoaluminate cement clinker and anhydrite or sulphoaluminate cement clinker, anhydrite and flyash by proportioning, mix in the adding mixer, get low alkalinity gel material;
2) get 45 ~ 60% of the water yield in the proportioning, add and transfer gel material, dissolving, add again stone, insert and stir 25 ~ 45s in the stirrer, add subsequently 40 ~ 55% of low alkalinity gel material total amount, stir 45 ~ 65s, add again remaining low alkalinity gel material, water and water reducer, stir 105 ~ 135s; Get and newly mix low alkalinity ecological concrete;
3) newly mix low alkalinity ecological concrete and divide three layers to join in the mould, every layer with φ 16mm tamper tamping 20 times, vibrates 6 ~ 10s at shaking table, then applies the pressure of 0.01～0.1MPa, namely gets low alkalinity ecological concrete.
2. low alkalinity ecological concrete according to claim 1 is characterized in that, described sulphoaluminate cement clinker comprises the mineral composition of following quality percentage composition: C
4A
3S 36.0 ~ 52.8%, C
2S 23.0 ~ 32.0%, iron phase 8.0 ~ 21.0%.
3. low alkalinity ecological concrete according to claim 1 is characterized in that, described water reducer is polycarboxylate water-reducer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108101437A (en) * | 2016-11-25 | 2018-06-01 | 济南大学 | A kind of lightweight concrete for plant growth suitable for wet land protection engineering |
| CN109851258B (en) * | 2018-12-29 | 2020-09-11 | 山东永正水泥有限公司 | Cementing material and preparation method thereof, concrete road and paving method thereof |
| CN112759343B (en) * | 2020-12-31 | 2022-11-11 | 山东大学 | Solid waste based low-alkalinity porous ecological pervious concrete and preparation method thereof |
| CN114656178B (en) * | 2022-03-18 | 2023-05-02 | 中交四航工程研究院有限公司 | Cementing material and application thereof |
| CN114751693B (en) * | 2022-04-06 | 2022-09-23 | 盐城市福奇混凝土有限公司 | Low-alkali plant-growing concrete for protection and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671133A (en) * | 2009-09-30 | 2010-03-17 | 永州市中大特种水泥有限责任公司 | Modified low-alkalinity sulphoaluminate cement |
| CN101786838A (en) * | 2010-01-20 | 2010-07-28 | 北京新中岩建材科技有限公司 | Early strength grouting material |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671133A (en) * | 2009-09-30 | 2010-03-17 | 永州市中大特种水泥有限责任公司 | Modified low-alkalinity sulphoaluminate cement |
| CN101786838A (en) * | 2010-01-20 | 2010-07-28 | 北京新中岩建材科技有限公司 | Early strength grouting material |
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Effective date of registration: 20200721 Address after: 266736 north side of the east end of Haichuan Road, Nancun Town, Pingdu City, Qingdao City, Shandong Province Patentee after: Qingdao Weili Commercial Concrete Co.,Ltd. Address before: The central city of Ji'nan City Jiwei road 250022 Shandong province No. 106 University of Jinan Patentee before: University of Jinan |
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