Effects of nanoparticle on the dynamic behaviors of recycled aggregate concrete under impact loading

Li, Wengui; Luo, Zhibing; Long, Chu; Wu, Chengqing; Duan, Wenhui; Shah, Surendra P.

doi:10.1016/j.matdes.2016.09.045

Cited by 157 publications

(42 citation statements)

References 31 publications

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“…It seems that the addition of nanosilica in contents up to 0.8% (by mass of cement) to the RAC mixes is very bene cial and can result in comparable strength to that of the control mix R0 (mix with natural coarse aggregate), in particular at RA content of 50% [34]. Similar compressive strength enhancements were observed by [26,28,29] but at di erent dosages of nanoparticles of SiO 2 . e strength enhancement could be attributed to the reduced porosity and modi ed microstructure of the RA particles and RAC due to the addition of the nanoparticles of SiO 2 [34].…”

Section: Compressive Strengthmentioning

confidence: 59%

“…Hosseini et al [27,28] found that the compressive strength of RAC increased to reach a similar strength to that of NAC, when 3% (by mass of cement) of nano-SiO 2 is added to the RAC mixture. Also, Li et al [29] reported that the static compressive strength of modi ed RAC with 2% (by mass of cement) of nanosilica was higher than that of the RAC without nanosilica by 21.6%. e addition of 2% of nanosilica also improved the dynamic compressive strength of RAC [29].…”

Section: Introductionmentioning

confidence: 99%

“…Also, Li et al [29] reported that the static compressive strength of modi ed RAC with 2% (by mass of cement) of nanosilica was higher than that of the RAC without nanosilica by 21.6%. e addition of 2% of nanosilica also improved the dynamic compressive strength of RAC [29]. Since only few studies have tackled improving the performance of RAC using nanoparticles of SiO 2 , this study aims at investigating the effect of using nano-SiO 2 to improve the mechanical properties and modify the microstructure of RAC.…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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e aim of this paper was to examine the feasibility of using nanoparticles of SiO 2 (nanosilica) to improve the performance of recycled aggregate concrete (RAC) containing recycled aggregate (RA) derived from processing construction and demolition waste of concrete buildings. e examined properties include compressive strength, splitting tensile strength, and water absorption. e study also includes examining the microstructure of RA and RAC with and without nanoparticles of SiO 2 . In total, nine mixes were investigated. Two mixes with RA contents of 50% and 100% were investigated and for each RA content; three mixes were prepared with three different nanoparticles dosages 0.4%, 0.8%, and 1.2% (by mass of cement). A control mix with natural aggregate (NA) was also prepared for comparison reasons. e results show that nanoparticles of silica can improve the compressive strength, tensile strength, reduce the water absorption, and modify the microstructure of RAC.

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Section: Compressive Strengthmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Younis

Mustafa

2018

Advances in Materials Science and Engineering

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“…The raw materials, such as aggregates, which occupy about 60-75% of total concrete [6], are also consumed in large quantities [4,7]. As an efficient way to reduce damage to the environment and to save non-renewable resources, recycling and crushing the construction waste into recycled aggregate for concrete has attracted much attention [2,[8][9][10][11][12]. Recycled coarse aggregate has been studied and applied to roadway construction, concrete pavement and other civil engineering works recently [4,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Utilizing Recycled Fine Aggregate for the Preparation of High Ductility Cementitious Composites

Gao

Yang

et al. 2020

Materials

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Waste concrete was recycled and crushed into fine aggregate to prepare a high ductility cementitious composite (HDCC) in this study, for helping dispose the massive amount of construction waste and for reserving natural resources. Firstly, the features of recycled fine aggregate (RFA) were analyzed in detail and compared with natural fine aggregate (NFA). After that, the mechanical properties, including compression, flexure, bending and tension, and the microstructure of high ductility cementitious composite (HDCC) prepared with RFA were systematically investigated and compared with that of HDCC prepared with NFA. The results show that, since RFA has a higher water absorption rate and contains 4.86 times as much crush dust as NFA, HDCC with RFA forms a denser matrix and a higher bond between fiber and matrix than HDCC with NFA. Thus, HDCC with RFA has higher compressive, flexural, bending and tensile strength. Meanwhile, the higher bond between the fiber and matrix of HDCC with RFA and the finer particle sizes of RFA can greatly promote the development of multiple cracking. As a result, HDCC with RFA exhibits more remarkable stain hardening, and presents 182.73% higher peak deflection in bending and 183.33% higher peak strain in tension than HDCC with NFA. Finally, with the consideration of fiber volume fraction, the prediction models for the peak strengths of HDCC with RFA were proposed. The prediction results show a good agreement with the test results.

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“…Since then, research on recycled aggregate concrete (RAC) has become progressively more systematic. Mechanical properties, durability, and micro-characteristics of RAC have been experimentally investigated by 2 of 21 many scholars [6,[9][10][11][12][13][14][15][16][17][18]. New technologies have also been proposed to improve the quality of concrete filled with recycled aggregates in recent years [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

Yong

Chen

2018

Applied Sciences

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Directly adopting coarsely crushed demolished concrete lumps (DCLs) with pouring concrete (referred to as fresh concrete, FC) in new structural members has been demonstrated to be more efficient and environmental than the traditional approach of recycling waste concrete as coarse aggregate particles. In this study, 45 prisms made of FC and DCLs were tested under axial compressive loading up to failure. The varied parameters included the dimensions of the prisms, the replacement ratio of DCLs, and the characteristic size of the lumps. The compressive performance of 36 cubes and cylinders was also experimentally examined for comparison. A formula was developed to predict the strength of compound concrete prisms filled with DCLs. Empirical formulas were also established relating a prism's strength with its elastic modulus and peak strain. It was found that: (a) when the replacement ratio is between 20% and 40%, the strength of a prism is about 1.13 that of a cylinder, due to the casting direction of the prism being different from that of the cylinder; (b) as the size of filler lumps increases relative to the size of the specimen, the strength of prisms decreases faster than that of cylinders, which weaken faster than cubes; and (c) due to the coupling effect of the aggregate size of FC and the specimen size, the compressive strength of prisms first increases with their size and then declines gradually.

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Effects of nanoparticle on the dynamic behaviors of recycled aggregate concrete under impact loading

Cited by 157 publications

References 31 publications

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Experimental Study of Utilizing Recycled Fine Aggregate for the Preparation of High Ductility Cementitious Composites

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

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Effects of nanoparticle on the dynamic behaviors of recycled aggregate concrete under impact loading

Cited by 157 publications

References 31 publications

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO2 to Improve the Performance of Recycled Aggregate Concrete

Experimental Study of Utilizing Recycled Fine Aggregate for the Preparation of High Ductility Cementitious Composites

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

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Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete

Feasibility of Using Nanoparticles of SiO₂ to Improve the Performance of Recycled Aggregate Concrete