Effect of nano metakaolin on compressive strength of recycled concrete

Xie, Jinsheng; Zhang, Heng; Duan, Long Chen; Yao, Yang; Yan, Jie; Shan, Doudou; Liu, Xinglong; Pang, Jingjing; Chen, Yueyao; Li, Xu; Zhang, Yannian

doi:10.1016/j.conbuildmat.2020.119393

Cited by 73 publications

(25 citation statements)

References 11 publications

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“…Meanwhile, Figure 8b-d demonstrate that the process of cement hydration is promoted to varying degrees, and the density of cement stone continues to rise with increased NS content. In this way, NS promotes the formation of a C-S-H gel, which is consistent with the conclusion obtained from the test results of Roncem [30]. Therefore, NS improves the strength of cement, cement mortar and concrete.…”

Section: Sem Microstructure Analysissupporting

confidence: 91%

“…Figure 7 divides recycled aggregate concrete into three transition zones [ 29 ]: (1) the transition zone between the recycled aggregate and the old mortar stuck to the recycled aggregate; (2) the transition zone between the new and old mortar; (3) the transition zone between the recycled aggregate and new mortar.…”

Section: Discussionmentioning

confidence: 99%

“…Under the condition of NS substitution, with the rate of substitution and confining pressure unchanged, the peak stress of the NS-recycled aggregate concrete with PVA fibers is 1.21-1.40 times that of the samples without PVA fibers. Figure 7 divides recycled aggregate concrete into three transition zones [29]: (1) the transition zone between the recycled aggregate and the old mortar stuck to the recycled aggregate; (2) the transition zone between the new and old mortar; (3) the transition zone between the recycled aggregate and new mortar. Figure 6.…”

Section: Sem Microstructure Analysismentioning

confidence: 99%

“…Confining pressure/MPa Figure 7. Schematic of interface transition zones [29]. Figure 8 shows the SEM images of the microstructure of recycled aggregate concrete with different NS contents (0%, 1.0%, 2.0%, 3.0%).…”

Section: Sem Microstructure Analysismentioning

confidence: 99%

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Influence of Nano-SiO2 on the Mechanical Properties of Recycled Aggregate Concrete with and without Polyvinyl Alcohol (PVA) Fiber

Wang

Zhu

2021

Materials

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In recent years, recycled aggregate concrete (RAC) has become a research hotspot in the field of urban construction because of its resource utilization of construction waste. However, compared with original concrete, its strength is still low, which requires additional nano-SiO2 (NS) and fiber. In order to study the mechanism of strength improvement of RAC, this paper takes NS and polyvinyl alcohol (PVA) fiber as variable parameters; uniaxial and triaxial compression tests were carried out on RAC with PVA fiber and NS, and the mechanical properties of RAC were investigated The result shows that within the range of 3% NS content, an increase in the NS substitution rate causes the mechanical properties of RAC to improve significantly. The compressive strength of RAC increases again after adding PVA fiber; through a SEM (scanning electron microscopy) analysis of the specimen, it was found that the NS filled the micro-pores and micro-cracks in the RAC, and the PVA fiber changed the contact range between recycled aggregate and mortar, so the microstructure of the material was more compact. The mechanism of RAC strength improvement is explained in the microcosmic view.

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Section: Sem Microstructure Analysissupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Sem Microstructure Analysismentioning

confidence: 99%

Section: Sem Microstructure Analysismentioning

confidence: 99%

See 2 more Smart Citations

Influence of Nano-SiO2 on the Mechanical Properties of Recycled Aggregate Concrete with and without Polyvinyl Alcohol (PVA) Fiber

Wang

Zhu

2021

Materials

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“…where H(A i ) � (θ/t − 1) × (μ + v), A + j represents the value of PIS for the j-th criterion, and A − j represents the value of NIS for the j-th criterion Step 3: determine an objective function by using the PIS and NIS values: [30][31][32][33] where 0 ≤ w j ≤ 1 and j w j � 1 • d(•) represents the distance between two ILNs For example, for the two ILNs A 1 and A 2 , we have…”

Section: Definitionmentioning

confidence: 99%

The ILHWLAD-MCDM Framework for the Evaluation of Concrete Materials under an Intuitionistic Linguistic Fuzzy Environment

Chen

Zhang

et al. 2020

Journal of Mathematics

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Concrete, one of the sources of energy consumption and carbon emissions, is widely used in the construction industry. The selection of concrete materials raises the question of energy sustainability and turns it into a complex multicriteria decision-making (MCDM) issue. To address this, we present an MCDM framework based on the intuitionistic linguistic hybrid weighted logarithmic averaging distance (ILHWLAD). To begin with, the intuitionistic linguistic numbers are used to deal with the uncertainty and fuzziness of the decision-making process. In addition, in view of the significance and the ordered position of the input arguments, an intuitionistic linguistic hybrid weighted logarithmic averaging distance (ILHWLAD) operator is defined. We, then, initiate the criteria system and present the MCDM framework based on the ILHWLAD to select the finest concrete. A case study involving four alternative materials, namely, autoclaved aerated concrete (AAC), hollow concrete blocks (HCB), expanded polystyrene (EPS), and lime hemp concrete (LHC), is presented to verify the scientificity of the framework.

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Effect of Adding Fly Ash and Metakaolin on Mechanical Properties of Concrete

Singh

Goyal

2021

Lecture Notes in Civil Engineering

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Effect of nano metakaolin on compressive strength of recycled concrete

Cited by 73 publications

References 11 publications

Influence of Nano-SiO2 on the Mechanical Properties of Recycled Aggregate Concrete with and without Polyvinyl Alcohol (PVA) Fiber

Influence of Nano-SiO2 on the Mechanical Properties of Recycled Aggregate Concrete with and without Polyvinyl Alcohol (PVA) Fiber

The ILHWLAD-MCDM Framework for the Evaluation of Concrete Materials under an Intuitionistic Linguistic Fuzzy Environment

Effect of Adding Fly Ash and Metakaolin on Mechanical Properties of Concrete

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