Post-fire compressive strength of recycled PET aggregate concrete reinforced with steel fibers: Optimization and prediction via RSM and GEP

Nematzadeh, Mahdi; Shahmansouri, Amir Ali; Fakoor, Maziar

doi:10.1016/j.conbuildmat.2020.119057

Cited by 125 publications

(32 citation statements)

References 47 publications

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“…However, the water retention capacity of these materials is not so much. Concerning this, the use of some materials with more porosity such as crushed bricks and pozzolana (volcanic porous gravel) can be considered as a promising approach to enhance the water absorption capacity of drainage layer as stated by some researchers (Akbarzadeh Bengar et al 2020;Berardi et al 2014;Coma et al 2016;Courard et al 2010;Jahandari et al 2017;Nematzadeh et al 2020;Saberian et al 2019a). Regarding this, Ngan (2004) showed that the recycled crushed brick can be used in the substrate and drainage layers.…”

Section: Introductionmentioning

confidence: 99%

Simulation of humidity and temperature distribution in green roof with pozzolana as drainage layer: Influence of outdoor seasonal weather conditions and internal ceiling temperature

Kazemi

Courard

2021

Science and Technology for the Built Environment

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The outdoor seasonal weather conditions can influence the insulation performance of extensive green roof. In addition, the thermal behavior of extensive green roof can be affected by the thickness of its layers including substrate and drainage layer. On the other hand, the replacement of polyethylene modular panel with porous aggregates as drainage layer can affect the water retention capacity of green roof. Therefore, in this study, the green roofs with pozzolana (porous volcanic gravel) as drainage layer under constant and variable inside temperatures were modeled and subjected to the weather conditions of winter and summer to assess the humidity and temperature variations in the depth of the systems. The results showed that there was a decrease in temperature through the depth of the green roof system for the winter period, while the reverse occurred for the relative humidity. During the winter period, the green roof model with the 10-cm substrate and 8-cm pozzolana was recommended to be used.However, the model with the 8-cm substrate and 6-cm drainage layer had the best insulation performance, particularly for the summer period. Moreover, the internal ceiling temperature fluctuation of system under variable inside temperature was higher than that under constant inside temperature.

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Section: Introductionmentioning

confidence: 99%

Simulation of humidity and temperature distribution in green roof with pozzolana as drainage layer: Influence of outdoor seasonal weather conditions and internal ceiling temperature

Kazemi

Courard

2021

Science and Technology for the Built Environment

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“…Concrete incorporating mixed recycled plastic types has rarely been investigated when compared with the relatively large amount of research on single plastic types as fibre addition [2,3]. However, most researchers reported that the inclusion of mixed types of plastic waste as partial replacement of fine or coarse aggregate affected some of the engineering properties of concrete.…”

Section: Introductionmentioning

confidence: 99%

Stress-Strain Behaviour and Mechanical Strengths of Concrete Incorporating Mixed Recycled Plastics

et al. 2021

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Different types of recycled plastic have been used in concrete and most studies have focused on the behaviour of a single type of plastic. However, separating plastic wastes increases the cost and time of processing. To tackle this problem, this research presents an experimental investigation to determine the effect of incorporating different combinations of three types of recycled plastic waste aggregates—Polyethylene terephthalate (PET), High Density Polyethylene (HDPE) and Polypropylene (PP)—at different replacement ratios of coarse aggregate on physical and mechanical properties of concrete. The combinations include two plastic types at 10% and 20% replacement ratios and three plastic types at 15% and 30% replacement ratios. The performance of the plastic concrete was assessed based on various physical and mechanical properties including workability, fresh and dry densities, air content, compressive, indirect tensile and flexural strengths, modulus of elasticity, stress-strain behaviour and ultrasonic pulse velocity. It is found that the workability of Mixed Recycled Plastic Concrete (MRPC) at a low replacement rate is independent of the type of plastic. The minimum reduction in the compressive strength, indirect tensile and modulus of elasticity were achieved by R3 (PET + PP) at 10% replacement, while R5 (HDPE + PP) at 10% replacement achieved the highest flexural strength and ultrasonic pulse velocity values. The findings suggest that the mixed recycled plastics have a good possibility to partially replace coarse aggregates in concrete which will benefit the plastics recycling community and environment. Furthermore, the study will provide guidance to the concrete industry concerning the effect of the implementation of unsorted mixed types of plastic as coarse aggregates in the production of concrete.

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“…Over the past few decades, the rapid increase in urban areas has exerted pressure on the environment owing to the high consumption of natural resources in the construction sector and low energy performance of building envelope components such as walls and roofs. For instance, 60-80% of global energy consumption has been derived from urban areas, even though they occupy only 3% of the Earth's land [1][2][3][4][5]. Since the greatest amount of urban spaces has been covered by roofing systems [6], the use of green roofs as one of the building envelope components has been proposed, and it has been frequently installed in rooftops to broaden the green infrastructure with high energy efficiency in the construction process [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Measurement within Green Roof with Incinerated Municipal Solid Waste Aggregates

2021

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A green roof is composed of a substrate and drainage layers which are fixed on insulation material and roof structure. The global heat resistance (Rc) within a green roof is affected by the humidity content of the substrate layer in which the coarse recycled materials can be used. Moreover, the utilization of recycled coarse aggregates such as incinerated municipal solid waste aggregate (IMSWA) for the drainage layer would be a promising solution, increasing the recycling of secondary resources and saving natural resources. Therefore, this paper aims to investigate the heat transfer across green roof systems with a drainage layer of IMSWA and a substrate layer including recycled tiles and bricks in wet and dry states according to ISO-conversion method. Based on the results, water easily flows through the IMSWAs with a size of 7 mm. Meanwhile, the Rc-value of the green roof system with the dry substrate (1.26 m2 K/W) was 1.7 times more than that of the green roof system with the unsaturated substrate (0.735 m2 K/W). This means that the presence of air-spaces in the dry substrate provided more heat resistance, positively contributing to heat transfer decrease, which is also dependent on the drainage effect of IMSWA. In addition, the Rc-value of the dry substrate layer was about twice that of IMSWA as the drainage layer. No significant difference was observed between the Rc-values of the unsaturated substrate layer and the IMSWA layer.

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Post-fire compressive strength of recycled PET aggregate concrete reinforced with steel fibers: Optimization and prediction via RSM and GEP

Cited by 125 publications

References 47 publications

Simulation of humidity and temperature distribution in green roof with pozzolana as drainage layer: Influence of outdoor seasonal weather conditions and internal ceiling temperature

Simulation of humidity and temperature distribution in green roof with pozzolana as drainage layer: Influence of outdoor seasonal weather conditions and internal ceiling temperature

Stress-Strain Behaviour and Mechanical Strengths of Concrete Incorporating Mixed Recycled Plastics

Heat Transfer Measurement within Green Roof with Incinerated Municipal Solid Waste Aggregates

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