On the mechanism of internal temperature and humidity response of recycled aggregate concrete based on the recycled aggregate porous interface

Liu, Chao; Liu, Huawei; Zhu, Chao; Bai, Guoliang

doi:10.1016/j.cemconcomp.2019.04.016

Cited by 30 publications

(9 citation statements)

References 31 publications

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“…Consequently, these properties cause the mechanical properties of RCA to be inferior to that of NA, which limits the application of recycled concrete in civil engineering. Although the mechanical properties of recycled aggregates are poor, different scholars, institutions, and countries have been applying recycled aggregates into structures through rational design and experiment in recent years, and in some cases, good results have been achieved [17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

et al. 2019

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This paper aims to manufacture recycled concrete hollow block (RCHB) which can be used for the masonry structure with seismic requirements. Five RCHB masonry walls were tested under cyclic loading to evaluate the effect of the axial compression stress, aspect ratio, and the materials of structural columns on the seismic performance. Based on the test results, the failure pattern, hysteresis curves, lateral drift, ductility, stiffness degradation, and the energy dissipation of the specimens were analyzed in detail. The results showed that with the increase of aspect ratios, the ductility of RCHB masonry walls increased, but the horizontal bearing capacity and energy dissipation of RCHB masonry walls decreased. With the increase of compressive stress, the bearing capacity and energy dissipation performance of RCHB masonry walls were improved, and the stiffness degraded slowly. The results also demonstrated that the RCHB masonry walls with structural columns, depending on whether the structural columns were prepared by ordinary concrete or recycled concrete, could increase the bearing capacity, ductility, and energy dissipation of specimens. The research confirmed that RCHB masonry walls could meet the seismic requirements through thoughtful design. Therefore, this study provided a new cleaner production for the utilization of construction waste resources.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

et al. 2019

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“…The effectiveness of this technique was investigated by comparing with three other incorporation techniques, i.e., direct introduction of bacteria, diatomaceous earth-immobilized bacteria (DE-immobilized bacteria) and expanded perlite-immobilized bacteria (EP-immobilized bacteria). In addition, the mechanical properties of the RA are better than those of the carriers used by the other researchers (Butler et al 2017;Chakradhara et al 2017;Edvardsen et al 2017;Liu et al 2019aLiu et al , 2019bLiu et al , 2019c. Based on the above considerations, the use of RA as a protective bacterial carrier to achieve crack self-healing will promote the development of self-repairing concrete.…”

Section: Introductionmentioning

confidence: 94%

Self-healing of Concrete Cracks by Immobilizing Microorganisms in Recycled Aggregate

Liu

et al. 2020

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Self-healing technology based on microbial induced carbonate precipitation can achieve cracks-healing of concrete. As concrete cracks appear, dormant bacterial spores introduced into concrete are activated, and calcium lactate is used as substrate to form calcium carbonate for healing crack. Due to the harsh environment in concrete, bacterial spores directly introduced become inactivated. Therefore, the introduction of good protective carrier is critical, and the mechanical properties and economy of the carriers are also the keys to improving self-healing technology. In this study, recycled aggregate was used as a protective carrier for Bacillus pasteurii to enhance the self-healing capacity. The effects of this technique were investigated by comparing with three other incorporation techniques, i.e., direct introduction of bacteria, diatomaceous earth-immobilized bacteria, and expanded perlite-immobilized bacteria. The healed crack width value of specimens incorporated with recycled aggregate-immobilized bacteria was close to that of specimens incorporated with expanded perlite-immobilized bacteria (the healed widths were 0.28 mm and 0.32 mm, respectively), which was larger than that of specimens incorporated with diatomaceous earth-immobilized bacteria (the healed width was 0.14 mm) and specimens directly introduced bacteria. Scanning electron microscope and electronic data switching analysis confirmed that precipitation formed at cracks was calcium carbonate.

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“…In addition to the research on RA modification, some other methods were also proposed to improve the compressive strength of RAC by reducing water to cement ratio 27,28 or using supplementary cementitious materials (SCM) 17,29–34 . Although these methods are feasible and effective, both of them are achieved through the improvement of mortar quality without taking into account the complex characteristics of RA.…”

Section: Introductionmentioning

confidence: 99%

Optimizing mix proportion of recycled aggregate concrete by readjusting the aggregate gradation

Duan

Guo³

2020

Structural Concrete

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It is necessary to ensure the properties of recycled aggregate concrete (RAC) can meet the requirements of those for the corresponding natural aggregate concrete (NAC), since only in such cases recycled aggregates (RA) may be accepted for structural use. This study aims to propose a modified design method of RAC based on aggregate gradation readjustment (AGR). It tries to maintain the effective amounts of both the coarse and fine aggregates of RAC similar to that of the NAC after concrete mixing as it is well known that due to the weakness of the old attached mortar to RA, the gradation of the aggregates would be undesirably changed. Two series of concrete mixtures were conducted. One was to examine the variations of the compressive strength and porosity along with the aggregate adjustment ratio using a single RA source; while the other one was used to verify the effect of the proposed AGR method through the investigation of concrete properties made with RAs obtained from different sources. The results show that the proposed method was beneficial to improving all the properties of RAC investigated.

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On the mechanism of internal temperature and humidity response of recycled aggregate concrete based on the recycled aggregate porous interface

Cited by 30 publications

References 31 publications

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

Self-healing of Concrete Cracks by Immobilizing Microorganisms in Recycled Aggregate

Optimizing mix proportion of recycled aggregate concrete by readjusting the aggregate gradation

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