Location
Jinan, P.R. China
Event Website
http://icdcs2022.ujn.edu.cn/
Keywords
strength, carbonation resistance, recycled waste plastic (RWP), ethylene-vinyl acetate (EVA), nanosilica (nS)
Abstract
Carbonation resistance enhancement of cement mortars with recycled plastics using ethylene-vinyl acetate and nanosilica
Plastic has surpassed most of the man-made materials, and it has been accumulated as “waste” in the environment for several decades. Replacement of natural aggregates in concrete with recycled waste plastic (RWP) attracted great attentions in recent years due to the high potentials of recycling waste plastic. This employment of RWPs in concrete, however, was accompanied by reduction in mechanical properties and durability performances (e.g., carbonation) due to the poor interactions between RWP and cement matrix. The aim of this study is to lessen the mechanical defects of cement mortars with RWPs and enhance the carbonation resistance by employing Ethylene-vinyl acetate (EVA) and nanosilica (nS) in the mortar mixtures. 2 to 4 % of EVA and nS were substituted for cement in mortars with 10 and 15 % RWPs. Strength and carbonation resistance of the mortars were measured. Microstructure was investigated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Results showed that as much as 5.5 % improvement in strength and 50% reduction in carbonation depth were recorded for mortars with the EVA-nS addition. EVA created polymer films around the RWPs to improve cohesion with the cement matrix, while nS filled the pores and enhanced the material compactness. Our findings would pave a path to fabricate stronger and more durable cement mortar with RWP.
Revised version after getting a comment through an email.
Carbonation resistance enhancement of cement mortars with recycled plastics using ethylene-vinyl acetate and nanosilica
Jinan, P.R. China
Carbonation resistance enhancement of cement mortars with recycled plastics using ethylene-vinyl acetate and nanosilica
Plastic has surpassed most of the man-made materials, and it has been accumulated as “waste” in the environment for several decades. Replacement of natural aggregates in concrete with recycled waste plastic (RWP) attracted great attentions in recent years due to the high potentials of recycling waste plastic. This employment of RWPs in concrete, however, was accompanied by reduction in mechanical properties and durability performances (e.g., carbonation) due to the poor interactions between RWP and cement matrix. The aim of this study is to lessen the mechanical defects of cement mortars with RWPs and enhance the carbonation resistance by employing Ethylene-vinyl acetate (EVA) and nanosilica (nS) in the mortar mixtures. 2 to 4 % of EVA and nS were substituted for cement in mortars with 10 and 15 % RWPs. Strength and carbonation resistance of the mortars were measured. Microstructure was investigated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Results showed that as much as 5.5 % improvement in strength and 50% reduction in carbonation depth were recorded for mortars with the EVA-nS addition. EVA created polymer films around the RWPs to improve cohesion with the cement matrix, while nS filled the pores and enhanced the material compactness. Our findings would pave a path to fabricate stronger and more durable cement mortar with RWP.
https://docs.lib.purdue.edu/icdcs/2022/parti/4
