CN106186945A - A kind of regeneration concrete and preparation method thereof - Google Patents
A kind of regeneration concrete and preparation method thereof Download PDFInfo
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- CN106186945A CN106186945A CN201610554215.7A CN201610554215A CN106186945A CN 106186945 A CN106186945 A CN 106186945A CN 201610554215 A CN201610554215 A CN 201610554215A CN 106186945 A CN106186945 A CN 106186945A
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- 239000004567 concrete Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 230000008929 regeneration Effects 0.000 title 1
- 238000011069 regeneration method Methods 0.000 title 1
- 239000012615 aggregate Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 229910021487 silica fume Inorganic materials 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000008187 granular material Substances 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000010920 waste tyre Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- -1 sawdust Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明公开一种再生混凝土及其制备方法,由包括水泥、水、细骨料、再生粗骨料、硅粉、钢纤维、橡胶颗粒、减水剂的原料制备得到,所述再生粗骨料、钢纤维与橡胶颗粒的质量比为(2.80~3.00):(0.20~0.25):(0.05~0.20)。本发明的再生混凝土由包括再生粗骨料、橡胶颗粒、钢纤维、硅粉的组分制得,在实现对废弃材料再利用的同时提高再生混凝土的力学性能,具有很好的应用前景。The invention discloses a recycled concrete and a preparation method thereof. It is prepared from raw materials including cement, water, fine aggregate, recycled coarse aggregate, silicon powder, steel fiber, rubber particles, and a water reducer. The recycled coarse aggregate , The mass ratio of steel fiber to rubber particle is (2.80~3.00):(0.20~0.25):(0.05~0.20). The regenerated concrete of the invention is prepared from components including regenerated coarse aggregate, rubber granules, steel fibers and silicon powder, which improves the mechanical properties of the regenerated concrete while realizing the reuse of waste materials, and has good application prospects.
Description
技术领域technical field
本发明属于新型建筑材料技术领域,涉及一种再生混凝土及其制备方法。The invention belongs to the technical field of new building materials, and relates to recycled concrete and a preparation method thereof.
技术背景technical background
再生混凝土技术是将废弃混凝土破碎清洗分级后,按一定的比例混合形成再生粗骨料,部分或全部代替天然骨料配制混凝土的技术。该技术可以解决废弃混凝土的占地和处理的问题,减少污染和节约能源。但是,再生粗骨料存在着某些缺陷,如破碎过程引起的损伤,较大的孔隙率,残留水泥基,较高吸水率等。由于这些缺陷,再生粗骨料多被用于铺设道路的垫层和制作绿化砖等非结构领域,限制了其应用渠道。Recycled concrete technology is a technology that mixes waste concrete in a certain proportion to form recycled coarse aggregate after crushing, cleaning and grading, and partially or completely replaces natural aggregate to prepare concrete. This technology can solve the problems of land occupation and disposal of waste concrete, reduce pollution and save energy. However, there are some defects in recycled coarse aggregate, such as damage caused by the crushing process, large porosity, residual cement base, high water absorption, etc. Due to these defects, recycled coarse aggregate is mostly used in non-structural fields such as paving cushions and making green bricks, which limits its application channels.
橡胶、硅粉和钢纤维在混凝土基体中能协调工作,形成混杂效应,共同改善再生混凝土性能,使其具有优秀的抗压、弯折性能,适用于目前各类混凝土工程。橡胶硅粉钢纤维再生粗骨料混凝土不仅具有材料来源广泛,还能扩大再生粗骨料的应用范围,提高资源的回收利用效率,减少环境污染问题。Rubber, silica fume and steel fibers can work in harmony in the concrete matrix to form a hybrid effect, which jointly improves the performance of recycled concrete, making it have excellent compression and bending properties, and is suitable for various types of concrete projects. Rubber silica fume steel fiber recycled coarse aggregate concrete not only has a wide range of material sources, but also can expand the application range of recycled coarse aggregate, improve the efficiency of resource recycling and reduce environmental pollution.
发明内容Contents of the invention
针对上述现有技术的不足,本发明提供一种再生混凝土及其制备方法,本发明的再生混凝土由包括再生粗骨料、橡胶颗粒、钢纤维、硅粉的原料制得,在实现对废弃材料再利用的同时提高再生混凝土的力学性能,具有很好的应用前景。Aiming at the deficiencies in the prior art above, the present invention provides a recycled concrete and a preparation method thereof. The recycled concrete of the present invention is made from raw materials including recycled coarse aggregate, rubber granules, steel fibers, and silicon powder. It has a good application prospect to improve the mechanical properties of recycled concrete while recycling.
本发明的目的通过以下技术方案实现:The object of the present invention is achieved through the following technical solutions:
一种再生混凝土,由包括水泥、水、细骨料、再生粗骨料、硅粉、钢纤维、橡胶颗粒、减水剂的原料制备,所述再生粗骨料、钢纤维与橡胶颗粒的质量比为(2.80~3.00):(0.20~0.25):(0.05~0.20)。A kind of recycled concrete, prepared from raw materials including cement, water, fine aggregate, recycled coarse aggregate, silicon powder, steel fiber, rubber particles, water reducer, the quality of the recycled coarse aggregate, steel fiber and rubber particle The ratio is (2.80~3.00):(0.20~0.25):(0.05~0.20).
优选的,所述水泥、硅粉与水的质量比为1.00:(0.05~0.15):(0.50~0.55)。Preferably, the mass ratio of the cement, silica fume and water is 1.00:(0.05-0.15):(0.50-0.55).
优选的,所述水泥与再生粗骨料的质量比为1.00:(2.80~3.00)。优选的,所述再生粗骨料是由粒径5~10mm和10~20mm的骨料,按1:1混合而成,符合连续级配。Preferably, the mass ratio of the cement to the recycled coarse aggregate is 1.00:(2.80-3.00). Preferably, the recycled coarse aggregate is formed by mixing aggregates with a particle size of 5-10mm and 10-20mm at a ratio of 1:1, which conforms to continuous gradation.
优选的,所述水泥与细骨料的质量比为1.00:(1.80~2.40),本发明所用细骨料没有特殊限制。Preferably, the mass ratio of the cement to the fine aggregate is 1.00:(1.80-2.40), and the fine aggregate used in the present invention is not particularly limited.
所述橡胶颗粒为废旧轮胎制成的橡胶颗粒,优选粒径为0.85-1.40mm,与细骨料发挥相同作用,可改善混凝土的弹性,提高混凝土的塑性变形。The rubber granules are rubber granules made from waste tires, preferably with a particle size of 0.85-1.40mm, which play the same role as fine aggregates, can improve the elasticity of concrete, and increase the plastic deformation of concrete.
所述硅粉是冶炼工业硅或含硅合金时产生的工业尘埃经回收得到的硅粉,优选比表面积为20×103~23×103m2/kg,由于硅粉具有极强的火山灰性能,能加速水泥的水化过程,提高混凝土的力学性能。更优选的,所述硅粉的SiO2含量为98.5%,烧失量为2.14%,含水率为0.3%,氯离子含量0.017%,总碱量为0.4%。The silicon powder is silicon powder obtained by recycling industrial dust produced when smelting industrial silicon or silicon-containing alloys. The preferred specific surface area is 20×10 3 to 23×10 3 m 2 /kg. It can accelerate the hydration process of cement and improve the mechanical properties of concrete. More preferably, the SiO2 content of the silicon powder is 98.5%, the ignition loss is 2.14%, the water content is 0.3%, the chloride ion content is 0.017%, and the total alkali content is 0.4%.
所述钢纤维由普通钢板剪切并经压制成型,优选长径比为45~60,更优选抗拉强度为600MPa,密度为7.82~7.85g/cm3;加入后乱向分布于混凝土基体中会产生的桥接和拉结效应,能够有效地阻碍混凝土内部微裂缝的扩展及宏观裂缝的形成,提高混凝土性能。The steel fibers are cut by ordinary steel plates and pressed into shape, preferably with an aspect ratio of 45-60, more preferably a tensile strength of 600MPa, and a density of 7.82-7.85g/cm 3 ; after being added, they are randomly distributed in the concrete matrix The bridging and tie effects that will be produced can effectively hinder the expansion of micro-cracks and the formation of macro-cracks inside the concrete, and improve the performance of concrete.
所述可再生混凝土的制备原料中还包括减水剂,实际用量和物质种类没有特殊要求。The raw materials for the preparation of the renewable concrete also include a water reducer, and there are no special requirements for the actual amount and type of substance.
本发明利用橡胶颗粒、硅粉和钢纤维在混凝土基体中的协同作用及混杂效应,共同改善再生混凝土的力学性能,使其具有优秀的抗压、弯折性能,适用于各类混凝土工程,橡胶颗粒、硅粉、钢纤维及再生粗骨料均为再生材料,来源广泛,可以提高资源的回收利用效率,减少环境污染,并扩大再生粗骨料的应用范围。The invention uses the synergistic effect and hybrid effect of rubber particles, silicon powder and steel fibers in the concrete matrix to jointly improve the mechanical properties of recycled concrete, making it have excellent compression and bending properties, suitable for various concrete projects, rubber Granules, silicon powder, steel fiber and recycled coarse aggregate are all recycled materials with a wide range of sources, which can improve the efficiency of resource recycling, reduce environmental pollution, and expand the application range of recycled coarse aggregate.
本发明进一步提供再生混凝土的制备方法,包括如下步骤:The present invention further provides a preparation method for recycled concrete, comprising the steps of:
将再生粗骨料、钢纤维和橡胶颗粒混合搅拌,加入硅粉、水泥和细骨料后再搅拌,再加入减水剂及水混合,得到再生混凝土浆料,经过固化、养护,得到可再生混凝土。所述固化、养护的条件没有特殊限制。Mix and stir the recycled coarse aggregate, steel fiber and rubber particles, add silica fume, cement and fine aggregate and then mix, then add water reducer and water to mix to obtain recycled concrete slurry, which is cured and maintained to obtain renewable concrete slurry. concrete. The curing and curing conditions are not particularly limited.
本发明具有以下有益效果:The present invention has the following beneficial effects:
(1)本发明利用橡胶的高弹性、硅粉的火山灰和微填充效应及钢纤维的桥接和拉结效应,综合提高再生混凝土的力学性能;(1) The present invention utilizes the high elasticity of rubber, the volcanic ash of silica fume and the micro-filling effect and the bridging and knotting effect of steel fibers to comprehensively improve the mechanical properties of recycled concrete;
(2)本发明使用的橡胶颗粒是废旧轮胎处理得到,来源广泛,是具有高弹性的韧性材料,能够缓和混凝土内部的各种应力,减少混凝土内部原生裂缝的产生和发展,还能较好地提高混凝土的吸能和耗能能力;(2) The rubber granules used in the present invention are processed from waste tires and have a wide range of sources. They are tough materials with high elasticity, which can ease various stresses inside the concrete, reduce the generation and development of primary cracks inside the concrete, and better Improve the energy absorption and energy dissipation capacity of concrete;
(3)本发明使用的硅粉是冶炼工业硅产生的废料,来源广泛,具有极强的火山灰性能,能与水泥水化产生对强度不利的Ca(OH)2反应生成C-S-H凝胶,加速水泥的水化过程,不仅能减少水泥的使用,还能在减小由于再生粗骨料的自身缺陷和橡胶的加入所带来的强度损失,提高混凝土的力学性能,如抗压、弯曲韧性;(3) the silicon powder used in the present invention is the waste material that smelting industry silicon produces, and source is extensive, has extremely strong pozzolanic performance, can produce the Ca(OH) unfavorable to intensity with cement hydration 2Reaction generates CSH gel, accelerates cement The hydration process can not only reduce the use of cement, but also reduce the strength loss caused by the defects of recycled coarse aggregate and the addition of rubber, and improve the mechanical properties of concrete, such as compressive resistance and bending toughness;
(4)钢纤维乱向分布于混凝土基体中会产生的桥接和拉结效应,可以改善混凝土的抗裂性和获得较好的韧性和延性;(4) The bridging and tie effect produced by the chaotic distribution of steel fibers in the concrete matrix can improve the crack resistance of concrete and obtain better toughness and ductility;
(5)本发明综合上述材料的特性,可以显著改善再生混凝土的性能,使垃圾废料变废为宝、循环再利用,有利于促进再生粗骨料合理、广泛地应用于实际的建设工程中,节约社会资源,减少环境污染。(5) The present invention combines the characteristics of the above materials, can significantly improve the performance of recycled concrete, turn waste into treasure, and recycle and reuse, which is conducive to promoting the reasonable and extensive application of recycled coarse aggregate in actual construction projects, Save social resources and reduce environmental pollution.
具体实施方式detailed description
本发明可通过如下的实施例进一步的说明,但实施例不是对本发明保护范围的限制。The present invention can be further illustrated by the following examples, but the examples are not intended to limit the protection scope of the present invention.
本发明实施例1、2中再生混凝土浆料的制备方法为:取两种粒径范围的再生粗骨料混合,再与钢纤维、橡胶颗粒混合放入搅拌机搅拌90秒,然后将硅粉、水泥和细骨料加入搅拌机再搅拌90秒使其充分混合均匀,再将减水剂与水混合加入搅拌机搅拌180秒,得到再生混凝土浆料。The preparation method of the regenerated concrete slurry in the embodiment 1 and 2 of the present invention is: take the regenerated coarse aggregate of two kinds of particle size ranges and mix, then mix with steel fiber, rubber particle and put into the mixer and stir for 90 seconds, then silicon powder, Add cement and fine aggregate to the mixer and stir for 90 seconds to fully mix evenly, then mix the water reducer and water and add to the mixer and stir for 180 seconds to obtain recycled concrete slurry.
另制备对比的混凝土:取两种粒径范围的天然粗骨料混合,再与钢纤维混合放入搅拌机搅拌90秒,然后将水泥和细骨料加入搅拌机再搅拌90秒使其充分混合均匀,再将减水剂与水混合加入搅拌机搅拌180秒,得到对比的天然混凝土浆料。Prepare contrasting concrete: mix natural coarse aggregates in two particle size ranges, mix them with steel fibers and put them in a mixer for 90 seconds, then add cement and fine aggregates into the mixer and mix them for 90 seconds to fully mix them evenly. Then mix the water reducing agent with water and add to the mixer and stir for 180 seconds to obtain the natural concrete slurry for comparison.
实施例1、2中橡胶颗粒、硅粉、钢纤维、再生粗骨料、细骨料、水泥、水及减水剂的用量及对比实施例中天然粗骨料、细骨料、钢纤维、水泥、水及减水剂的用量参见表1,表中数据为单位体积再生混凝土的材料用量(单位:kg/m3).The consumption of rubber particle, silicon powder, steel fiber, regenerated coarse aggregate, fine aggregate, cement, water and water-reducing agent in embodiment 1, 2 and natural coarse aggregate, fine aggregate, steel fiber, The amount of cement, water and water reducer is shown in Table 1. The data in the table is the material amount per unit volume of recycled concrete (unit: kg/m 3 ).
表1Table 1
注:附加水为考虑再生骨料吸水率较大的特点,为使混凝土的水灰比保持不变,额外增加以再生骨料质量的2%来计算而得的附加水Note: The additional water is to consider the characteristics of the high water absorption rate of the recycled aggregate. In order to keep the water-cement ratio of the concrete unchanged, the additional water calculated by 2% of the mass of the recycled aggregate is added.
实施例1、2及对比实施例使用的各种材料的参数指标如下:The parameter index of the various materials that embodiment 1, 2 and comparative examples use are as follows:
(1)水泥:采用石井牌42.5R等级的普通硅酸盐水泥;(1) Cement: Ordinary Portland cement of Shijing brand 42.5R grade;
(2)细骨料:采用连续级配的天然细骨料,为比重为2.69、细度模数为2.52、的中粗河砂;(2) Fine aggregate: use continuously graded natural fine aggregate, which is medium-coarse river sand with a specific gravity of 2.69 and a fineness modulus of 2.52;
(3)天然粗骨料:分别为粒径介于5mm~10mm和10mm~20mm的天然粗骨料,质量比1:1,符合连续级配;(3) Natural coarse aggregate: natural coarse aggregate with a particle size between 5mm-10mm and 10mm-20mm respectively, with a mass ratio of 1:1, which conforms to continuous gradation;
(4)再生粗骨料:深圳市绿发鹏程环保科技有限公司生产,分别为粒径介于5mm~10mm和10mm~20mm的再生粗骨料,质量比1:1,符合连续级配,吸水率为2%,除去杂物如玻璃、木屑、砖块等,用清水清洗后,自然晾干待用。(4) Regenerated coarse aggregate: produced by Shenzhen Lvfa Pengcheng Environmental Protection Technology Co., Ltd., which are recycled coarse aggregates with particle sizes ranging from 5mm to 10mm and 10mm to 20mm. The mass ratio is 1:1, which conforms to continuous gradation. The water absorption rate is 2%, remove sundries such as glass, sawdust, bricks, etc., wash with clean water, and dry naturally for use.
(5)橡胶颗粒:颗粒粒径为0.85-1.40mm,密度为1.05g/cm3,熔点为170℃;(5) Rubber particles: the particle size is 0.85-1.40mm, the density is 1.05g/cm 3 , and the melting point is 170°C;
(6)硅粉:成都东蓝星科有限公司生产,SiO2含量为98.5%,烧失量为2.14%,比表面积为22.99×103m2/kg,含水率为0.3%,氯离子含量0.017%,总碱量为0.4%;(6) Silicon powder: produced by Chengdu Donglanxingke Co., Ltd., with SiO 2 content of 98.5%, ignition loss of 2.14%, specific surface area of 22.99×10 3 m 2 /kg, moisture content of 0.3%, and chloride ion content 0.017%, total alkalinity is 0.4%;
(7)钢纤维:广州今粤新型材料有限公司提供的剪切波浪型纤维,由普通钢板剪切并经压制成型,长度为32mm,长径比为45,抗拉强度为600MPa,密度为7.82g/cm3,熔点为1538℃;(7) Steel fiber: The shear wave fiber provided by Guangzhou Jinyue New Material Co., Ltd. is cut by ordinary steel plate and pressed into shape. The length is 32mm, the aspect ratio is 45, the tensile strength is 600MPa, and the density is 7.82 g/cm 3 , melting point is 1538°C;
(8)减水剂:广东省江门强力建材科技有限公司生产,型号为QL-PC5。(8) Water reducing agent: produced by Jiangmen Qiangli Building Materials Technology Co., Ltd., Guangdong Province, the model is QL-PC5.
将上述实施例1、2及对比实施例制备的混凝土浆料倒入标准塑模并用振捣棒振捣密实,用塑料薄膜覆盖,养护24小时后拆模,为使强度达到稳定,在室内浇水养护28天,然后室外静置90天,得到1-3#混凝土试件,进行测试,通过材料压缩试验机对φ150mm×300mm的标准圆柱体来进行在单轴压缩加载测试所得混凝土的轴心抗压强度和弹性模量,通过全数字电液伺服动静试验机对100mm×100mm×515mm的小梁进行三点弯曲试验测试所得混凝土的抗折强度,数据见表2。Pour the concrete slurry prepared in the above-mentioned Examples 1, 2 and Comparative Example into a standard mold and vibrate it compactly with a vibrator, cover it with a plastic film, remove the mold after curing for 24 hours, and pour it indoors to make the strength stable. Water curing for 28 days, and then stand outside for 90 days to obtain 1-3# concrete specimens for testing, and use a material compression testing machine to perform a uniaxial compression load test on a standard cylinder of φ150mm×300mm to test the axial center of the obtained concrete The compressive strength and modulus of elasticity are the flexural strength of the concrete obtained through the three-point bending test of the small beam of 100mm×100mm×515mm by a full-digital electro-hydraulic servo dynamic and static testing machine. The data are shown in Table 2.
表2Table 2
由表中数据可见,本发明制备的再生混凝土相对对比实施例的混凝土,硅粉能增强再生混凝土的抗压强度,在橡胶低掺量时能获得比天然混凝土更高的抗压强度,即硅粉和橡胶均能提高混凝土的韧性,断裂韧度均比天然混凝土高。而橡胶的掺入效果尤为显著,随着橡胶掺量的增多,断裂能大幅增加。As can be seen from the data in the table, the recycled concrete prepared by the present invention is relative to the concrete of comparative examples. Silica fume can enhance the compressive strength of recycled concrete, and can obtain higher compressive strength than natural concrete when the rubber content is low. Both powder and rubber can improve the toughness of concrete, and the fracture toughness is higher than that of natural concrete. The effect of rubber incorporation is particularly significant, and the fracture energy increases significantly with the increase of rubber content.
最后应当说明的是,以上实施例仅用以说明本发明的技术方案而非对本发明保护范围的限制。本领域的技术人员应当理解,可以对本发明的技术方案进行若干推演或者等同替换,而不脱离本发明技术方案的实质和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than limit the protection scope of the present invention. Those skilled in the art should understand that several inferences or equivalent replacements can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
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