Influences of water to cement ratio on brittleness and fracture parameters of self-compacting lightweight concrete

Fracture behavior of self-compacting semi-lightweight concrete containing nano-silica

“…As can be seen, by increasing the w/b ratio from 0.35 to 0.45, C f decreases by 25.7%. The same trend was reported by the previous studies for SCLC (Karamloo et al, 2016a, 2016b; Salehi and Mazloom, 2018a). For example, Karamloo et al (2016a) stated that by decreasing the w/b ratio from 0.5 to 0.35, C f increases by 28%.…”

“…To evaluate the fracture behavior of concrete, some of the fracture factors such as fracture process zone, fracture energy, critical crack-tip opening displacement, and fracture toughness must be determined (Gettu et al, 1990). In the past studies, several researchers have investigated the effects of various factors such as the maximum aggregate size, amount of aggregate, coarse aggregate volume, age of concrete, water to cement (w/c) ratio, the mineral powder content, fiber, and magnetic water on the fracture parameters of different types of concrete (Beygi et al, 2014b(Beygi et al, , 2013Carpinteri and Brighenti, 2010;Ghasemi et al, 2018;Karamloo et al, 2016aKaramloo et al, , 2016bKaramloo et al, , 2017Karamloo and Mazloom, 2018;Korte et al, 2014;Nikbin et al, 2016;Petersson, 1980;Salehi and Mazloom, 2018a). Petersson (1980) stated that using stronger aggregate and the reduction of w/c ratio in the concrete mix increased fracture energy.…”

“…Most recently, some of the experimental research works have focused on the fracture behavior of SCLC. In this regard, Karamloo et al (2016aKaramloo et al ( , 2016b focused on SCLC and investigated the effects of w/c ratio and the aggregate size on the fracture parameters and brittleness. They reported that when the size of maximum aggregate decreased from 19 to 9.5 mm, the fracture energy decreased by 86.7% and 47.7% for w/c ratios of 0.4 and 0.35, respectively.…”

Assessment of the influence of micro- and nano-silica on the behavior of self-compacting lightweight concrete using full factorial design

“…Also, it should be mentioned that benefiting from all aspects of this material requires a deep understanding of its performance. In all these few researches that have been done on self-compacting lightweight concrete, various parameters of this concrete have been investigated (Güneyisi et al 2015(Güneyisi et al , 2016Karamloo et al 2016a), but still there are parameters that have not been discussed. SCLC may have different behavior in comparison with normal concrete (NC) and NWSCC due to different materials such as the type of aggregate and the volume of paste.…”

Factors Affecting Brittleness Behavior of Coal-Gangue Ceramsite Lightweight Aggregate Concrete

“…These tested properties include: strength (Cui et al, 2012a;Ilya et al, 2018;Medine et al, 2018), density (Lau et al, 2018), elasticity (Hilal et al, 2016), shrinkage (Alexandre Bogas et al, 2015;Rumšys et al, 2017), creep (Libre et al, 2011), thermal conductivity (Nguyen et al, 2017), abrasion resistance (Real and Bogas, 2017), and adsorption (Krc, 2015;Muñoz-Ruiperez et al, 2018). Although LWAC has its superiority in high strength and low density, LWAC has more obvious brittleness compared with other ordinary concretes, which can be partially attributed to its high strength (Beygi et al, 2014;Karamloo et al, 2016). The brittleness can cause expansion and growth of unstable cracks, which are difficult to control and repair.…”