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Concrete Recycling最新文献

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Characterization of recycled concrete aggregates 再生混凝土骨料的表征
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-5
S. Rémond, J. Mechling, R. Trauchessec, E. Garcia-Diaz, R. Lavaud, B. Cazacliu
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引用次数: 2
Towards a multirecycling process 迈向多重循环过程
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-41
T. Sedran, D. Dao, A. Feraille
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引用次数: 0
Recycled concrete at early age 早期的再生混凝土
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-12
E. Rozière, A. Z. Bendimerad, A. Loukili, J. Souche, M. Salgues, E. Garcia-Diaz, P. Devillers
This chapter presents the methodology and results of a comprehensive experimental study about early age behavior of concrete with recycled concrete aggregates (RCA). This study includes the determination of RCA total absorption and absorption rate, the behavior of fresh concrete under standard and severe drying conditions, and the assessment of properties of hardening concrete. The RCA used in this study (provided by RECYBÉTON Project) showed high absorption rate. They reached 90% of the nominal absorption within the first 2 h, and their absorption was even faster in fresh cement paste. The monitoring of RCA water saturation in cement paste also showed a release of absorbed water when exposed to severe drying. When shifting from standard to severe drying, the increase of evaporation rate did not result in increased shrinkage to mass-loss ratios. However higher shrinkage magnitudes were reached because plastic shrinkage development was accelerated in severe drying conditions thus it could develop before setting. The air entry pressure concept was used to analyze the cracking sensitivity of fresh concrete. It was assessed on various concrete mixtures with and without RCA. A strong correlation was found between air entry pressure and negative capillary pressure at cracking time. The Free water to Binder ( W f / B ) ratio was found to influence directly
本章介绍了一项关于再生混凝土骨料(RCA)混凝土早期行为的综合实验研究的方法和结果。本研究包括RCA总吸收率和吸收率的测定,新拌混凝土在标准和严重干燥条件下的性能,以及硬化混凝土性能的评估。本研究使用的RCA(由RECYBÉTON项目提供)具有较高的吸收率。它们在前2小时内达到90%的标称吸收率,并且在新鲜水泥浆中吸收更快。对水泥浆体中RCA水饱和度的监测也表明,在严重干燥条件下,水泥浆体中吸收的水分会释放出来。当从标准干燥转变为严重干燥时,蒸发速率的增加并没有导致收缩率的增加。然而,由于在严重的干燥条件下塑性收缩的发展加快,因此它可以在凝固前发展,因此达到了较高的收缩率。采用进风压力的概念分析了新拌混凝土的开裂敏感性。对不同的混凝土混合料进行了掺加和不掺加RCA的评估。裂化时的入气压力与毛细负压力有很强的相关性。自由水与粘结剂(wf / B)比直接影响了粘结剂的性能
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引用次数: 0
Specifications of concrete with recycled aggregates 再生骨料混凝土规范
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-20
W. Pillard, T. Sedran, P. Rougeau
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引用次数: 0
Demolition techniques and obtained materials 爆破技术和获得的材料
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-3
S. Decreuse, N. Comte, C. Raillon
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引用次数: 0
Bond of reinforcement in recycled aggregate concrete 再生骨料混凝土中钢筋的粘结
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-24
E. Ghorbel, G. Wardeh, B. Fouré
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引用次数: 0
Experimental construction sites 实验建筑工地
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-29
P. Dantec
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引用次数: 1
Slab-on-grade Slab-on-grade
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-30
F. Larrard, E. Garcia, T. Dao, C. D. Sa, F. Benboudjema, D. Rogat
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引用次数: 0
Members in shear 受剪构件
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-28
G. Wardeh, E. Ghorbel, B. Fouré
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引用次数: 0
Quality control in the French context 法国环境下的质量控制
Pub Date : 2019-03-04 DOI: 10.1201/9781351052825-36
A. B. Fraj, P. Dantec
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引用次数: 0
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Concrete Recycling
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