Construction and Building Materials 195 (2019) 198–207
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Construction and Building Materials journal homepage: www.elsevier.com/locate/conbuildmat
Physical, mechanical and thermal properties of lightweight composite mortars containing recycled polyvinyl chloride Yassine Senhadji a,b,⇑, Hocine Siad c, Gilles Escadeillas d, Ahmed Soufiane Benosman e, Ramdane Chihaoui b, Mohamed Mouli b, Mohamed Lachemi c a
Dep. of Civil Engineering, Univ. of Mascara, Mascara 29000, Algeria Dep. of Civil Engineering, Laboratory of Materials, ENPO, Oran 31000, Algeria Ryerson University, 350 Victoria St., Toronto, ON M5B 2K3, Canada d University of Toulouse, 135, Avenue de Rangueil, 31077 Toulouse, France e Laboratory of Polymer Chemistry, University of Oran, Oran 31000, Algeria b c
h i g h l i g h t s Possibility of using recycled PVC as an alternative fine aggregate. Increasing PVC aggregates content an increase of acid resistance was observed. The mechanical properties of PVC-mortars composite decreased with PVC replacement level. Plastic aggregates reduced both mortar density and thermal conductivity.
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Article history: Received 7 July 2018 Received in revised form 29 September 2018 Accepted 8 November 2018
Keywords: Plastic waste Recycling Polyvinyl chloride (PVC) Strong acids Thermal conductivity Lightweight materials
a b s t r a c t This paper presents an experimental investigation into the use of waste recycled polyvinyl chloride (PVC) as an alternative fine aggregate in eco-friendly mortars. The aim is to improve the brittle behavior of cementitious materials in strong acid environments as well as the improvement of the thermal insulation performance of the developed material. Mortars incorporating 0, 10, 30, 50 and 70% PVC as a replacement for natural sand were studied. Density, compressive and flexural strengths, ultrasonic pulse velocity, and thermal conductivity tests were performed to evaluate the properties of PVC-mortar composites. The resistance of different mixes to strong acids was examined based on 5 weeks’ of immersion in 5% sulfuric acid (H2SO4), 5% hydrochloric acid (HCl), and 5% nitric acid (HNO3) solutions. The results showed that the incorporation of up to 70% PVC into lightweight ductile mortars is possible, though values of compressive and flexural strengths and ultrasonic pulse velocity decreased with increase in PVC content. In addition, the use of PVC aggregates by natural sand replacement caused the resistance of mortars against strong acids to increase considerably. Based on the thermal conductivity results, mortars with higher PVC aggregates rates improved the thermal insulation of composite mortars. Ó 2018 Elsevier Ltd. All rights reserved.
1. Introduction Considering the growing trend of concrete production and excessive use of construction materials around the world, the civil engineering sector is increasingly connected to massive environmental burdens. In addition to Portland cement, which is the primary ingredient responsible for higher ecological impacts, the
⇑ Corresponding author at: Dep. of Civil Engineering, Univ. of Mascara, Mascara 29000, Algeria. E-mail address:
[email protected] (Y. Senhadji). https://doi.org/10.1016/j.conbuildmat.2018.11.070 0950-0618/Ó 2018 Elsevier Ltd. All rights reserved.
manufacturing of concrete requires a large amount of aggregates, accounting for more than 75% of the volume of mortars and concretes [1]. The aggregate production process is also highly energy intensive and their extensive use is always associated with a continual impoverishment of naturally available raw materials. Furthermore, the use of natural aggregates usually requires capitalintensive operations including; extraction, crashing, separation and transportation, which highly influence the financial cost of structures [2]. On the other hand, a huge volume of industrial waste is generated annually causing a real environmental concern, especially for solid waste materials that require special procedures
