Abstract
This paper presents the behavior of concrete properties by replacing the conventional coarse aggregate used in the concrete mixture by two types of lightweight aggregate; Expanded Perlite Aggregate (EPA) and Volcanic Pumice (VP). To fulfill this aim; three laboratory tests were applied; density, compressive strength, and abrasion resistance, that conducted to extrapolate the range of the changes in the properties of concrete with existence those types of aggregate in the mixture. Also, the volumetric proportion adopted as a strategy for replacing the coarse aggregate by EPA or VP in the concrete mixture. Then, the volumetric proportion ranged from 10% to 50% with the variation step was 10%. Therefore, ten concrete mixtures are prepared and divided into two groups; each group contains five concrete mixes to represent the volumetric replacement (10-50)% of conventional coarse aggregate by EPA or VP. On the other hand, one extra mixture designed by using conventional aggregate (coarse and fine aggregate) without any inclusion of EPA or VP to be considered as a reference mixture. The obtained laboratory results of this study proved that the density, compressive strength, and abrasion resistance readings of concrete decreased at any volumetric proportion replacement of coarse aggregate by EPA or VP. The decrease in density and compressive strength of concrete readings amounted the peak level at 50% replacing of coarse aggregate by EPA, which were 38.19% and 77.37%, respectively than the reference mixture. Additionally, the compressive strength is an important factor affecting the abrasion resistance of concrete mixture, and loss of abrasion decreased as compressive strength increased.
Highlights
Lightweight Concrete (LWC) is a versatile material that has a great interest and large industrial demand in recent years in a wide range of construction projects, despite its known use dating back over 2000 years
At the same volumetric proportion of replacement, the specimens with Volcanic Pumice (VP) exhibited more strength to abrasion than those contained Expanded Perlite Aggregate (EPA) as shown in Table 12, Figure 8, and Figure 9. These back that the total porosity of VP is relatively lower than the EPA, as well as, the compressive resistance of EPA is lower than the VP
The same reasons explain why the less abrasion resistance recorded at C6 that contain the highest volumetric proportion of EPA replacement to the total volume of conventional aggregate
Summary
Lightweight Concrete (LWC) is a versatile material that has a great interest and large industrial demand in recent years in a wide range of construction projects, despite its known use dating back over 2000 years. Alshihri et al [4] pointed out that the LWC could employ for rapid evolution in construction applications of high rise buildings larger-sized and long-span concrete structures. According to Neville and Brooks [5], there are three kinds of LWC: the first kind through substitution the normal weight aggregate by lightweight aggregate of low specific gravity (lower than 2.6) and this kind of concrete is well known as lightweight aggregate concrete. Through eliminating the fine aggregate from the mix, this is considered as the last kind of LWC; and it is known as nofines concrete. Vilches et al [7] classified the LWC into three groups based on their use and physical properties (for structural use, for both structural/insulating purpose and for insulating)
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