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Strength characteristics and failure criterion of plain recycled aggregate concrete under triaxial stress states
Highlights Triaxial tests were performed on plain structural RAC for the two replacement percentages of recycled coarse aggregate. The triaxial strength and failure mode characteristics of RAC are discussed, and the corresponding conclusions are drawn. A new failure criterion with the six parameters under multiaxial stress states is proposed for plain RAC.
Abstract Triaxial tests were performed on 150mm×150mm×150mm cubic specimens of plain structural recycled aggregate concrete (RAC) for two replacement percentages of recycled coarse aggregate by mass at all kinds of stress ratios, using a large static–dynamic true triaxial machine. Friction-reducing pads, using two layers of plastic membrane with mobil lubricants were placed between the compressive loading plate and the specimens; the tensile loading planes of concrete samples were processed by an attrition machine, and then the samples were glued-up with the loading plate with structural glue. The failure mode characteristic of specimens and the direction of the cracks were observed and described. The three principally static strengths in the corresponding stress state were measured. The influence of the replacement percentages of the recycled coarse aggregate and stress ratios on the triaxial strengths of RAC was also analyzed. The experimental results showed that the ratios of the triaxial to its corresponding uniaxial compressive strength for the two RAC are higher than that of the conventional concrete (CC), especially under triaxial compression; moreover, they are dependent on the replacement percentages of recycled coarse aggregate, the stress states and stress ratios; however, the differences of tensile–compressive ratios between the two RAC and CC are notsignificant. On this basis, a new failure criterion with the six parameters is proposed for plain RAC under multiaxial stress states. It provides the experimental and theoretical foundations for strength analysis of RAC structures subject to complex loads.
Strength characteristics and failure criterion of plain recycled aggregate concrete under triaxial stress states
Highlights Triaxial tests were performed on plain structural RAC for the two replacement percentages of recycled coarse aggregate. The triaxial strength and failure mode characteristics of RAC are discussed, and the corresponding conclusions are drawn. A new failure criterion with the six parameters under multiaxial stress states is proposed for plain RAC.
Abstract Triaxial tests were performed on 150mm×150mm×150mm cubic specimens of plain structural recycled aggregate concrete (RAC) for two replacement percentages of recycled coarse aggregate by mass at all kinds of stress ratios, using a large static–dynamic true triaxial machine. Friction-reducing pads, using two layers of plastic membrane with mobil lubricants were placed between the compressive loading plate and the specimens; the tensile loading planes of concrete samples were processed by an attrition machine, and then the samples were glued-up with the loading plate with structural glue. The failure mode characteristic of specimens and the direction of the cracks were observed and described. The three principally static strengths in the corresponding stress state were measured. The influence of the replacement percentages of the recycled coarse aggregate and stress ratios on the triaxial strengths of RAC was also analyzed. The experimental results showed that the ratios of the triaxial to its corresponding uniaxial compressive strength for the two RAC are higher than that of the conventional concrete (CC), especially under triaxial compression; moreover, they are dependent on the replacement percentages of recycled coarse aggregate, the stress states and stress ratios; however, the differences of tensile–compressive ratios between the two RAC and CC are notsignificant. On this basis, a new failure criterion with the six parameters is proposed for plain RAC under multiaxial stress states. It provides the experimental and theoretical foundations for strength analysis of RAC structures subject to complex loads.
Strength characteristics and failure criterion of plain recycled aggregate concrete under triaxial stress states
He, Zhen-jun (author) / Zhang, Jia-xing (author)
Construction and Building Materials ; 54 ; 354-362
2013-12-19
9 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2014
Strength and deformation of recycled aggregate concrete under triaxial compression
| British Library Online Contents | 2017