Influence of recycled concrete aggregates and blended cements on the mechanical properties of pervious concrete
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TECHNICAL PAPER
Influence of recycled concrete aggregates and blended cements on the mechanical properties of pervious concrete Dilraj Singh1 · S. P. Singh1 Received: 1 February 2020 / Accepted: 10 June 2020 © Springer Nature Switzerland AG 2020
Abstract The paper presents the results of an investigation conducted to study the strength properties of pervious concrete containing coarse recycled concrete aggregates (RCA). In this study, 13 pervious concrete mixes were prepared with the use of RCA replacing coarse natural aggregates (NA) by 0, 25, 50, 75 and 100%. Keeping the water–cement (w/c) ratio constant, Viscosity Modified Agent (VMA) was added at 0.8% by weight of binder content. Being environmentally advantageous, 30% Fly Ash (FA) has been added with 70% Ordinary Portland Cement (PC) in the binder of control mix. Despite being environmentally safe product, metakaolin (MK) also tends to enhance the properties of concrete containing RCA. Therefore, keeping the PC content 70% for all mixes, FA was replaced with MK at two different levels of 5% and 10% to improve the properties of pervious concrete made with RCA. Specimens in the form of cubes, cylinders and beams were prepared for studying the mechanical properties at different ages of curing. The test results showed that there was significant loss in compressive, splitting tensile and flexural strength of pervious concrete while increasing the percentage of RCA replacing NA. Addition of 5% MK compensated the decrement noticed in the strength properties after replacement of NA with RCA. The mix with 25% RCA and 5% MK was having almost same compressive strength as that of reference mix. 10% MK further enhanced the strength properties and it was concluded that loss of compressive strength in pervious concrete due to addition of 50% RCA can be compensated by the addition of 10% MK. Keywords Pervious concrete · Porous concrete · Mechanical properties · Supplementary cementitious materials · Recycled concrete aggregates
Introduction The recent climate changes in the world crusade one’s brain to think about the necessary infrastructural changes to deal with the untimely abysmal storm water. The researchers in the past tried to study the climate change effects on storm water infrastructures in the urban areas of Las Vegas Valley and construed that life-time systems of drainage have to be designed with maximum capacity [44]. The higher growth of urbanisation leads to the development of impervious areas. The excessive growth of impervious areas leads to lower passing of water coming from rains into the ground [38]. An amazing type of concrete, called pervious concrete, porous concrete or no fines concrete is made up of interconnected * S. P. Singh [email protected] 1
Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology, Jalandhar 144 011, India
voided structure which allows the water percolation while preserving the structural performance (ACI [2] Chapter-1). Pervious concrete was first developed in 1980s in Japan for its eco-frien
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