Experimental Study on a Prediction Model of the Shrinkage and Creep of Recycled Aggregate Concrete

Lv, Zijian; Liu, Chao; Zhu, Chao; Bai, Guoliang; Qi, Hao

doi:10.3390/app9204322

Cited by 19 publications

(9 citation statements)

References 25 publications

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“…However, this considerable amount of waste concrete is mainly disposed of in landfills, resulting in a severe environmental problem [3][4][5][6]. In order to protect the ecological environment and achieve sustainable development, reducing, reusing, and recycling construction waste is a desirable approach to preserve the ecological environment [7][8][9][10][11]. Therefore, many countries have passed legislation to encourage the recycling of waste concrete for the resource utilization of recycled concrete.…”

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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“…As a result, the creep strain in DMDA concretes may be effectively limited. In addition, the low w/c ratio in the ACI concrete was found to contribute significantly to its high creep strain 63 …”

Section: Resultsmentioning

confidence: 98%

“…In addition, the low w/c ratio in the ACI concrete was found to contribute significantly to its high creep strain. 63 The respective impacts on creep strain of aggregate and water contents in the three concretes investigated in this study are given in Table 4. The data in these figures further confirm that the DMDA concrete samples exhibited better creep resistance than the ACI concrete sample.…”

Section: Creepmentioning

confidence: 99%

Densified mixture design algorithm: A novel mix design concept and its application for green concretes incorporating industrial by‐products

Nguyen

Limongan

Nguyen

et al. 2023

Env Prog and Sustain Energy

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Despite the fact that densified mixture design algorithm (DMDA) has been identified as a promising tool for green concrete mix design, its use in real practice has still been minimal worldwide. Due to the lack of precise information on DMDA computation in earlier studies, this work proposes DMDA including fly ash and ground granulated blast-furnace slag as a viable way to improve the long-term performance of green concrete. To encourage the use of DMDA, this study offers a detailed description of the DMDA mix design, as well as a step-by-step standard operating procedure and an empirical example of the computation. Assessments of the long-term performance of green mixtures (self-consolidating concrete and high-performance concrete) and ordinary Portland cement concrete (designed using the conventional method of American Concrete Institute, ACI) were made. Performances of the ACI (O6000 mixture) and DMDA concretes (S6000 and H6000 mixtures) were then compared in terms of compressive strength, elastic modulus, shrinkage, and creep strain. As a result, all of the concrete samples attained the target strength of above 41 MPa (6000 psi) after only 28 days. Moreover, compressive strength, elastic modulus, shrinkage, and creep strain increased significantly in all of the concretes over curing time. Importantly, the experimental results confirmed that both types of DMDA concrete exhibited higher compressive strength and better long-term performance than the ACI concrete under elastic modulus, creep, and shrinkage aspects.

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“…Research results show that RCAs are damaged during the production process, which produces numerous microcracks inside them [ 4 ]. Simultaneously, RCAs feature more edges and corners than NCAs, and hardened cement mortar can become attached to their surfaces, as shown in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the Mechanical Properties of Steel Fiber-Reinforced Recycled Concretes

2022

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A steel fiber-reinforced recycled concrete (SFRRC) is a porous material, and its macromechanical properties are affected by its microstructure. To elucidate the change rules and internal mechanisms of the mechanical properties of SFRRCs, the mechanical properties and failure modes of SFRRCs were studied at different water–cement ratio, replacement rate of recycled concrete aggregate (RCA), and steel fiber content. Moreover, the microstructures of the interface transition zones (ITZ) of the SFRRC specimens were tested by scanning electron microscopy and mercury intrusion, and the effect of the microscopic pore structure on the macromechanical properties of SFRRC was analyzed. The research results showed that an appropriate amount of steel fibers could reduce the size and number of cracks in the ITZ and improve the pore structure of an SFRRC. Based on the fractal dimension, porosity and other factors, the quantitative relationship between the macromechanical properties and microscopic pore structure parameters of SFRRCs was established.

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Experimental Study on a Prediction Model of the Shrinkage and Creep of Recycled Aggregate Concrete

Cited by 19 publications

References 25 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

Densified mixture design algorithm: A novel mix design concept and its application for green concretes incorporating industrial by‐products

Effect of Microstructure on the Mechanical Properties of Steel Fiber-Reinforced Recycled Concretes

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