CN104591656A - Low-drying shrinkage high-performance recycled concrete - Google Patents

Low-drying shrinkage high-performance recycled concrete Download PDF

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Publication number
CN104591656A
CN104591656A CN201510077283.4A CN201510077283A CN104591656A CN 104591656 A CN104591656 A CN 104591656A CN 201510077283 A CN201510077283 A CN 201510077283A CN 104591656 A CN104591656 A CN 104591656A
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China
Prior art keywords
recycled
aggregate
concrete
fine aggregate
coarse aggregate
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Pending
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CN201510077283.4A
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Chinese (zh)
Inventor
陈欣
郑建岚
罗素蓉
王雪芳
王国杰
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Fujian Jiangxia University
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Fujian Jiangxia University
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Abstract

The invention discloses low-drying shrinkage high-performance recycled concrete satisfying pumping requirements, and belongs to the technical field of civil engineering concrete. Every cubic meter of the high-performance recycled concrete comprises 400-500 kg of binding material, 950-1150 kg of coarse aggregate, 660-715 kg of fine aggregate, 160-180 kg of water and 4-9 kg 0f superplasticizer, wherein the coarse aggregate is a recycled coarse aggregate or a mixture of the recycled coarse aggregate and natural coarse aggregate; the fine aggregate is a natural fine aggregate or a mixture of the natural fine aggregate and a recycled fine aggregate and prepared by a process of stone enveloped with cement. The strength grade of the obtained high-performance recycled concrete is C30-C50 and the slump is 180-210 mm; the dry shrinkage of the recycled concrete can be effectively improved to ensure that the dry shrinkage value is reduced by more than 25% relative to the common recycled concrete and lower than the common concrete with same proportion. The low-drying shrinkage high-performance recycled concrete has a significant theoretical value and social meaning for the reasonable and wide application of recycled concrete and the resource recovery of construction waste.

Description

A kind of recycled high performance concrete of low dry shrinkage
Technical field
The invention belongs to civil engineering work technical field of concrete, be specifically related to a kind of recycled high performance concrete of low dry shrinkage.
Background technology
Concrete uses maximum material of construction at present, and the amount of concrete that the whole world uses every year is more than 10 billion cubic meters, and wherein required sandstone aggregate amount reaches 60-80 hundred million tons.A large amount of sandstone demands causes a large amount of to cut into a mountain for quarrying and dig sand in river, seriously destroys ecotope, constrains the Sustainable development of society.And on the other hand, construction waste rubbish is the chief component of municipal wastes, and wherein discarded concrete proportion is the highest, about has 30% ~ 50%.In order to solve above-mentioned two aspect difficult problems, the regeneration of discarded concrete just becomes an important problem.
Recycled high performance concrete is the high performance concrete using regeneration aggregate partly or entirely to replace the natural aggregate preparations such as sandstone.The high performance concrete possessing the advantages such as high-durability, high workability, high volume stability is combined with regeneration concrete, recycled concrete strength can be made up compared with the main drawback such as low, dry shrinkage is large, workability is poor, weather resistance is bad, thus expand the range of application of regeneration concrete.In view of following normal concrete is high-strength, the development trend of high performance, regeneration concrete also toward high-strength, high performance future development, thus should play the advantage of regeneration concrete self, realizes its huge economic benefit, social benefit and environmental benefit.
In normal concrete, main generation shrinkage strain is sand-cement slurry, and the shrinkage strain of coarse aggregate to sand-cement slurry plays restraining effect.The contractile mechanism of regeneration concrete with normal concrete substantially, but owing to producing contraction after the old sand-cement slurry water suction on regenerated aggregate top layer, and the Young's modulus of regenerated aggregate is less, its restraining effect is reduced, causes the dry shrinkage of generally regeneration concrete to be greater than normal concrete.The present invention, on regeneration aggregate pretreatment process, regeneration coarse-fine aggregate Replacement rate, mineral admixture affecting on synthetic study basis recycled high performance concrete dry shrinkage, proposes a kind of recycled high performance concrete of low dry shrinkage.
Summary of the invention
The object of the present invention is to provide a kind of recycled high performance concrete of low dry shrinkage, its intensity is C30-C50 medium tenacity, the slump is 180-210mm, overcome the shortcoming that common regeneration concrete dry shrinkage is large, meet pumping requirements.
For achieving the above object, the present invention adopts following technical scheme:
A kind of recycled high performance concrete of low dry shrinkage, include gelling material, coarse aggregate, fine aggregate, water and high efficiency water reducing agent, its proportioning is: every cubic metre of recycled high performance concrete comprises gelling material 400-500kg, coarse aggregate 950-1150kg, fine aggregate 660-715kg, water 160-180kg, high efficiency water reducing agent 4-9kg;
Described gelling material is the mixture of cement and flyash; Described coarse aggregate is the mixture of regenerated coarse aggregate or regenerated coarse aggregate and natural coarse aggregate; Described fine aggregate is the mixture of natural fine aggregate or natural fine aggregate and recycled fine aggregate.
In described gelling material, the grade of flyash is not less than II grade, and it accounts for 30% ~ 40% of gelling material weight; Cement is No. 42.5 ordinary Portland cements; Water-cement ratio is 0.36-0.40.
The rubble of described natural coarse aggregate to be continuous grading be 5-20mm; Described regenerated coarse aggregate meets the performance requriements about I ~ III class regenerated coarse aggregate in " the reinforcement of concrete regenerated coarse aggregate " (GB/T25177-2010) standard, and continuous grading, when particle diameter is 5-20mm; The consumption of regenerated coarse aggregate accounts for 70% ~ 100% of coarse aggregate weight.
The apparent density of described recycled fine aggregate, tap density, voidage all meet the index request to I class recycled fine aggregate in " concrete and mortar recycled fine aggregate " (GB/T 25176-2010) standard;
When the consumption of regenerated coarse aggregate accounts for 70% of coarse aggregate weight, the consumption of recycled fine aggregate is no more than 30% of fine aggregate weight, or the consumption of the recycled fine aggregate of washing is no more than 70% of fine aggregate weight; Described washing is poured into by recycled fine aggregate in uncovered basin to rinse with water, after the particle removing particle diameter≤0.15mm in the dust of attachment, impurity and recycled fine aggregate, picks up and dry.
Described natural fine aggregate is river sand, medium sand; Sand coarse aggregate ratio: 0.36-0.43.
During ready-mixed concrete, adopt stone enveloped with cement technique, namely first add gelling material, 3/5 water and 1/2 high efficiency water reducing agent and stir 60 seconds; Then add coarse aggregate and stir 90 seconds; Finally add fine aggregate, remaining water and high efficiency water reducing agent water and stir 90 seconds.
Existing result of study shows, regenerated coarse aggregate is soaked by chemical grout or the pre-treatment such as physical mechanical stirring, can reduce crush index and the water-intake rate of regenerated coarse aggregate to a certain extent, and improve the ultimate compression strength of regeneration concrete, but the operation of these methods is all relatively complicated.The present invention adopts stone enveloped with cement Process to carry out pre-treatment, improve the degree of scatter of the gelling material such as cement, enhance the mechanical snap effect on regenerated coarse aggregate surface, enhance regeneration concrete interfacial transition zone, thus improve Young's modulus and the non-deformability of regeneration concrete, be conducive to the dry shrinkage reducing regeneration concrete.
Mineral admixture is one of indispensable component in high performance concrete, has important impact to concrete shrinkage cracking.Mix a certain proportion of flyash, slag or silicon ash, concrete shrinkage performance can be improved to a certain extent.But also rarely have report based on the regeneration concrete shrinkage research of stone enveloped with cement technique pre-treatment basis being mixed mineral admixture.The present invention by regenerated coarse aggregate through the process of stone enveloped with cement Process, regenerated coarse aggregate is made to have wrapped up one deck grout on the surface, and with coal ash instead part of cement, make to there is flyash again in the grout of parcel, due to effect pozzuolanic in flyash, the stable hydrated calcium silicate gel of gelating property can be generated, thus improve regeneration concrete interface structure and pore texture, improve compaction rate and the Young's modulus of regeneration concrete, correspondingly compensate for the part dry shrinkage produced because of hole dehydration.
Unusual effect of the present invention is:
(1) recycled high performance concrete that the present invention produces belongs to the medium tenacity scope of C30-C50, the slump is 180-210mm, be conducive to modernization pumping casting craft, and by rational regeneration aggregate pretreatment process, mix appropriate flyash and high efficiency water reducing agent, can effectively reduce regeneration concrete drying shrinkage value, make the air shrinkage value of gained recycled high performance concrete close even lower than normal concrete, improve the volume stability of high performance concrete, lay a good foundation for regeneration concrete uses rationally and widely.
(2) in the present invention, the Replacement rate of regenerated coarse aggregate can reach 70%-100%, the Replacement rate of recycled fine aggregate can reach 70% at most, it make use of discarded concrete on larger proportion, fundamentally can solve the problem that China's building waste is stacked in a large number, also promote the Sustainable development of China's scientific-technical progress, economic construction and environment simultaneously.
Accompanying drawing explanation
Fig. 1 is embodiment 1 gained recycled high performance concrete and the correlation curve with proportioning normal concrete dry shrinkage strain value.
Fig. 2 is embodiment 2 gained recycled high performance concrete and the correlation curve with proportioning normal concrete dry shrinkage strain value.
Fig. 3 is embodiment 3 gained recycled high performance concrete and the correlation curve with proportioning normal concrete dry shrinkage strain value.
Fig. 4 is embodiment 4 gained recycled high performance concrete and the correlation curve with proportioning normal concrete dry shrinkage strain value.
Embodiment
More being convenient to make content of the present invention understand, below in conjunction with embodiment, technical solutions according to the invention are described further, but the present invention being not limited only to this.
A kind of recycled high performance concrete of low dry shrinkage, include gelling material, coarse aggregate, fine aggregate, water and high efficiency water reducing agent, every cubic metre of recycled high performance concrete comprises gelling material 400-500kg, coarse aggregate 950-1150kg, fine aggregate 660-715kg, water 160-180kg, high efficiency water reducing agent 4-9kg;
Described gelling material is cement and flyash and mixture, and flyash used accounts for 30% ~ 40% of gelling material weight; Described coarse aggregate is the mixture of regenerated coarse aggregate or regenerated coarse aggregate and natural coarse aggregate; Described fine aggregate is the mixture of recycled fine aggregate and natural fine aggregate.
Wherein, flyash used is II grade of flyash; Cement used is No. 42.5 ordinary Portland cement water; The granite stones of natural coarse aggregate used to be continuous grading the be impact crushing of 5-20mm; The discarded concrete that regenerated coarse aggregate used is broken after removing from highway, this road is build up the beginning of the nineties in last century, the old label of concrete used is No. 200, particle diameter 5-20mm, its consumption accounts for 70% ~ 100% of coarse aggregate weight, the performance requriements to II class regenerated coarse aggregate in standard that integrated performance index meets " the reinforcement of concrete regenerated coarse aggregate " (GB/T25177-2010); The apparent density of recycled fine aggregate used, tap density, voidage all meet in " concrete and mortar recycled fine aggregate " (GB/T 25176-2010) standard I class recycled fine aggregate index request; The Min River, Fujian Province medium sand selected by natural fine aggregate used, fineness modulus 2.26, and apparent density is 2630Kg/m 3; High efficiency water reducing agent used is high-efficiency water-reducing agent of poly-carboxylic acid (TW-JS).
When regenerated coarse aggregate is 70% to the Replacement rate of natural coarse aggregate, the consumption of recycled fine aggregate is no more than 30% of fine aggregate weight, or the consumption of the recycled fine aggregate of washing is no more than 70% of fine aggregate weight; Described washing is poured into by recycled fine aggregate in uncovered basin to rinse with water, after the particle removing particle diameter≤0.15mm in the dust of attachment, impurity and recycled fine aggregate, picks up and dry.
During ready-mixed concrete, adopt stone enveloped with cement technique, namely first add gelling material, 3/5 water and 1/2 high efficiency water reducing agent and stir 60 seconds; Then add coarse aggregate and stir 90 seconds; Finally add fine aggregate, remaining water and high efficiency water reducing agent water and stir 90 seconds.
embodiment 1:
A recycled high performance concrete for low dry shrinkage, it includes gelling material 400kg(wherein cement 280kg, flyash 120kg), natural coarse aggregate 345kg, regenerated coarse aggregate 805kg, natural fine aggregate 660kg, water 160kg, high efficiency water reducing agent 9.0kg.The slump of gained recycled high performance concrete is 195mm, and 28 days cubic compressive strengths are 40.2MPa.Can test gained recycled high performance concrete 2RAC70-F30 (Y2) and the dry shrinkage with proportioning normal concrete NC1 respectively, the results are shown in Table 2.
embodiment 2:
A recycled high performance concrete for low dry shrinkage, it includes gelling material 500kg(cement 300kg, flyash 200kg), regenerated coarse aggregate 950kg, natural fine aggregate 715kg, water 180kg, high efficiency water reducing agent 5.0kg.The slump of gained recycled high performance concrete is 190mm, and 28 days cubic compressive strengths are 52.1MPa.Respectively gained recycled high performance concrete 2RAC100-F40 (Y2) and the Investigation of drying shrinkage of high with proportioning normal concrete NC2 are tested, the results are shown in Table 2.
embodiment 3:
A recycled high performance concrete for low dry shrinkage, it includes cement cementitious material 450kg(270kg, flyash 180kg), natural coarse aggregate 307kg, regenerated coarse aggregate 714kg, natural fine aggregate 476kg, recycled fine aggregate 204kg, water 180kg, high efficiency water reducing agent 4.0kg.The slump of gained recycled high performance concrete is 210mm, and 28 days cubic compressive strengths are 51.5Mpa.Respectively gained recycled high performance concrete 2RAC70-F40-RF30 (Y2) and the Investigation of drying shrinkage of high with proportioning normal concrete NC3 are tested, the results are shown in Table 2.
embodiment 4:
A recycled high performance concrete for low dry shrinkage, it includes gelling material 450kg(cement 270kg, flyash 180kg), natural coarse aggregate 307kg, regenerated coarse aggregate 714kg, natural fine aggregate 204kg, recycled fine aggregate 476kg, water 180kg, high efficiency water reducing agent 4.3kg.The slump of gained recycled high performance concrete is 180mm, and 28 days cubic compressive strengths are 48.5MPa.Respectively gained recycled high performance concrete 2RAC70-F40-RF70 (Y2) X and the Investigation of drying shrinkage of high with proportioning normal concrete NC4 are tested, the results are shown in Table 2.
Table 1 tests proportioning raw materials and the performance measurement result of sample
Adopt dial indicator to embodiment 1-4 and and the dry shrinkage strain value of normal concrete measure, the results are shown in Table 2.
The dry shrinkage strain value measurement result of table 2 embodiment 1-4 and normal concrete
As can be seen from table 1-2, the drying shrinkage strain value of recycled high performance concrete of the present invention is all lower than same proportioning normal concrete, and its 28d ultimate compression strength reaches 40.2-52.1MPa, and the slump is 180-210mm, meets high performance concrete pumping requirements.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.

Claims (7)

1. the recycled high performance concrete of a low dry shrinkage, containing gelling material, coarse aggregate, fine aggregate, water and high efficiency water reducing agent, it is characterized in that: every cubic metre of recycled high performance concrete comprises gelling material 400-500kg, coarse aggregate 950-1150kg, fine aggregate 660-715kg, water 160-180kg, high efficiency water reducing agent 4-9kg;
Described gelling material is the mixture of cement and flyash; Described coarse aggregate is the mixture of regenerated coarse aggregate or regenerated coarse aggregate and natural coarse aggregate; Described fine aggregate is the mixture of natural fine aggregate or natural fine aggregate and recycled fine aggregate.
2. the recycled high performance concrete of low dry shrinkage according to claim 1, it is characterized in that: in described gelling material, the grade of flyash is not less than II grade, it accounts for 30% ~ 40% of gelling material weight; Cement is No. 42.5 ordinary Portland cements; Water-cement ratio is 0.36-0.40.
3. the recycled high performance concrete of low dry shrinkage according to claim 1, is characterized in that: the rubble of described natural coarse aggregate to be continuous grading be 5-20mm; Described regenerated coarse aggregate meets the performance requriements to I ~ III class regenerated coarse aggregate in " the reinforcement of concrete regenerated coarse aggregate " (GB/T 25177-2010) standard, continuous grading, and particle diameter is 5-20mm; The consumption of regenerated coarse aggregate accounts for 70% ~ 100% of coarse aggregate weight.
4. the recycled high performance concrete of low dry shrinkage according to claim 1, is characterized in that: the apparent density of described recycled fine aggregate, tap density, voidage all meet the index request to I class recycled fine aggregate in " concrete and mortar recycled fine aggregate " (GB/T 25176-2010) standard.
5. the recycled high performance concrete of low dry shrinkage according to claim 1, it is characterized in that: when regenerated coarse aggregate accounts for 70% of coarse aggregate weight, the consumption of recycled fine aggregate is no more than 30% of fine aggregate weight, or the consumption of the recycled fine aggregate of washing is no more than 70% of fine aggregate weight;
Described washing is poured into by recycled fine aggregate in uncovered basin to rinse with water, after removing the particle of particle diameter≤0.15mm in the dust of attachment, impurity and recycled fine aggregate, picks up and dry.
6. the recycled high performance concrete of low dry shrinkage according to claim 1, is characterized in that: described natural fine aggregate is river sand, medium sand; Sand coarse aggregate ratio: 0.36-0.43.
7. the recycled high performance concrete of low dry shrinkage according to claim 1, is characterized in that: during ready-mixed concrete, adopts stone enveloped with cement technique, namely first adds gelling material, 3/5 water and 1/2 high efficiency water reducing agent and stir 60 seconds; Then add coarse aggregate and stir 90 seconds; Finally add fine aggregate, remaining water and high efficiency water reducing agent and stir 90 seconds.
CN201510077283.4A 2015-02-13 2015-02-13 Low-drying shrinkage high-performance recycled concrete Pending CN104591656A (en)

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Cited By (19)

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CN104944856A (en) * 2015-06-17 2015-09-30 东南大学 Method for preparing recycled concrete with stability performance
CN106045393A (en) * 2016-05-26 2016-10-26 甘肃德龙生态建材有限公司 Production equipment of ecological concrete
CN106082800A (en) * 2016-06-08 2016-11-09 福建江夏学院 A kind of have anti-crack concrete inhaling wave energy and preparation method thereof
CN106186898A (en) * 2016-06-30 2016-12-07 成都聚合科技有限公司 A kind of light gathering photovoltaic power generating system pedestal mixes earth
CN106277953A (en) * 2016-07-21 2017-01-04 武汉源锦商品混凝土有限公司 A kind of C30 regenerated aggregate concrete and preparation method thereof
CN106278032A (en) * 2016-08-12 2017-01-04 绍兴文理学院 A kind of use concrete mixing plant give up slurry preparation low dry shrinkage concrete
CN107010896A (en) * 2017-04-20 2017-08-04 福州大学 A kind of regeneration concrete for filling be chopped basalt fibre and regenerated coarse aggregate
CN108298917A (en) * 2018-04-08 2018-07-20 福建工程学院 Comprehensively utilize the pumping regeneration concrete and preparation method of solid waste
CN108751842A (en) * 2018-06-07 2018-11-06 西安理工大学 A kind of high-strength regeneration concrete and preparation method thereof adding waste and old cable
CN108793868A (en) * 2018-06-14 2018-11-13 苏州嘉盛远大建筑工业有限公司 A kind of regeneration concrete and its production technology of the waste material containing PC
CN108863202A (en) * 2018-06-07 2018-11-23 西安理工大学 A kind of admixture waste plastic packaging bag regeneration concrete and preparation method thereof
CN109081648A (en) * 2018-11-14 2018-12-25 兰州理工大学 A kind of regeneration gradient concrete material and preparation method thereof
CN109250978A (en) * 2017-07-14 2019-01-22 邰宝龙 A kind of regeneration concrete
CN109665762A (en) * 2019-01-07 2019-04-23 深圳市建筑设计研究总院有限公司 Pumpable regeneration monolith and preparation method thereof
CN109665778A (en) * 2019-01-15 2019-04-23 南阳师范学院 A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40
CN110357501A (en) * 2019-06-27 2019-10-22 刘生 A kind of concrete waste material concrete and preparation method thereof
CN110482928A (en) * 2019-07-30 2019-11-22 西安建筑科技大学 It is a kind of using recycled fine aggregate as self-repair concrete of carrier and preparation method thereof
CN110590294A (en) * 2019-10-29 2019-12-20 福州大学 Regenerated powder concrete with good durability and preparation method thereof
CN111732389A (en) * 2020-07-30 2020-10-02 中铁城建集团有限公司 Concrete prepared from construction waste and preparation method thereof

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CN104944856A (en) * 2015-06-17 2015-09-30 东南大学 Method for preparing recycled concrete with stability performance
CN106045393A (en) * 2016-05-26 2016-10-26 甘肃德龙生态建材有限公司 Production equipment of ecological concrete
CN106045393B (en) * 2016-05-26 2018-05-25 甘肃德龙生态建材有限公司 A kind of production equipment of eco-concrete
CN106082800B (en) * 2016-06-08 2018-01-02 福建江夏学院 It is a kind of that there is anti-crack concrete for inhaling wave energy and preparation method thereof
CN106082800A (en) * 2016-06-08 2016-11-09 福建江夏学院 A kind of have anti-crack concrete inhaling wave energy and preparation method thereof
CN106186898A (en) * 2016-06-30 2016-12-07 成都聚合科技有限公司 A kind of light gathering photovoltaic power generating system pedestal mixes earth
CN106277953A (en) * 2016-07-21 2017-01-04 武汉源锦商品混凝土有限公司 A kind of C30 regenerated aggregate concrete and preparation method thereof
CN106277953B (en) * 2016-07-21 2018-07-24 武汉源锦商品混凝土有限公司 A kind of C30 regenerated aggregate concretes and preparation method thereof
CN106278032A (en) * 2016-08-12 2017-01-04 绍兴文理学院 A kind of use concrete mixing plant give up slurry preparation low dry shrinkage concrete
CN106278032B (en) * 2016-08-12 2018-11-30 绍兴文理学院 A kind of low dry shrinkage concrete prepared using concrete mixing plant waste pulp
CN107010896A (en) * 2017-04-20 2017-08-04 福州大学 A kind of regeneration concrete for filling be chopped basalt fibre and regenerated coarse aggregate
CN109250978A (en) * 2017-07-14 2019-01-22 邰宝龙 A kind of regeneration concrete
CN109250978B (en) * 2017-07-14 2021-05-28 河北雄安昝岗混凝土有限公司 Recycled concrete
CN108298917A (en) * 2018-04-08 2018-07-20 福建工程学院 Comprehensively utilize the pumping regeneration concrete and preparation method of solid waste
CN108751842A (en) * 2018-06-07 2018-11-06 西安理工大学 A kind of high-strength regeneration concrete and preparation method thereof adding waste and old cable
CN108863202A (en) * 2018-06-07 2018-11-23 西安理工大学 A kind of admixture waste plastic packaging bag regeneration concrete and preparation method thereof
CN108793868A (en) * 2018-06-14 2018-11-13 苏州嘉盛远大建筑工业有限公司 A kind of regeneration concrete and its production technology of the waste material containing PC
CN109081648A (en) * 2018-11-14 2018-12-25 兰州理工大学 A kind of regeneration gradient concrete material and preparation method thereof
CN109665762A (en) * 2019-01-07 2019-04-23 深圳市建筑设计研究总院有限公司 Pumpable regeneration monolith and preparation method thereof
CN109665778A (en) * 2019-01-15 2019-04-23 南阳师范学院 A kind of preparation method for the useless brick coarse aggregate regeneration concrete that strength grade is C40
CN110357501A (en) * 2019-06-27 2019-10-22 刘生 A kind of concrete waste material concrete and preparation method thereof
CN110482928A (en) * 2019-07-30 2019-11-22 西安建筑科技大学 It is a kind of using recycled fine aggregate as self-repair concrete of carrier and preparation method thereof
CN110482928B (en) * 2019-07-30 2021-09-28 西安建筑科技大学 Self-repairing concrete with recycled fine aggregate as carrier and preparation method thereof
CN110590294A (en) * 2019-10-29 2019-12-20 福州大学 Regenerated powder concrete with good durability and preparation method thereof
CN111732389A (en) * 2020-07-30 2020-10-02 中铁城建集团有限公司 Concrete prepared from construction waste and preparation method thereof

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Application publication date: 20150506