Properties of Lightweight Concrete Containing Treated Pumice by Alkaline Solution

Abstract

The properties of lightweight concrete containing pumice treated with sodium hypochlorite (NaOCl), were experimentally investigated in this study. The study used treated pumice as 100 % replacement of fine and coarse aggregates in concrete mixtures. Untreated pumice aggregates were used to prepare reference mixtures. In addition, the study investigated the effect of sodium hypochlorite on pumice properties. The concrete compressive strength at ages of 7 and 28 days was tested. The results showed that the compressive strength of concrete that contained treated pumice increased by 200 % as compared to concrete containing untreated pumice. The pumice aggregate treated with NaOCl increased the pumice strength and improved its physical characteristics as the mean of specific gravity and abrasion resistance.

Comparison Mechanical Properties of Two Types of Light Weight Aggregate Concrete

“…The increment of replacement conventional coarse aggregate by EPA in C2, C3, C4, C5, C6 accompanied by the increasing in depth of wear by (23.94, 42.25, 57.75, 76,06, 91.54)% and also increase the abraded materials by (22.64, 45.27, 68.92, 92.57, 116.22)% as compared with C1. Additionally, the increment of VP dosage as replacement material instead of coarse aggregate in concrete mix as (10,20,30,40, and 50)% caused to increase the depth of wear by (13.43, 26.27, 38.81, 49.55, 61.79)% and also increase the abraded materials by (4.73, 17.36, 2919, 93.19, 50.95)% as compared with C1. The reason for increasing the depth of wear and abraded materials weights in the specimens is due to its contained either EPA or VP because of the low bonding achieved between the constituents of concrete and increased the porous for those specimens.…”

“…As it is evident in Table 10 and Figure 6, the kind of concrete automatically turned to normal to lightweight (the density of lightweight concrete less than 2000 kg/m 3 ) when increasing the percentage dosage of EPA or VP more than 10%. However, the incremental dose of EPA in the concrete mixture by (20,30,40, and 50) % in (C3, C4, C5, and C6) accompanied in decreasing the concrete density of (23.41, 30.39, 35.73, 38.19) % compared to the reference mixture. Additionally, the concrete density decreased as (19.51, 20.94, 22.18, and 24.23%) when transforming from the reference mixture to C7, C8, C9, C10, and C11, respectively.…”

“…Numan [19] added a super-plasticizer and Glenium 51 as additives substances to the concrete mixture to rise from the compressive resistance of concrete. The treatment pumice aggregate by sodium hypochlorite solution has a significant impact on increasing the compressive strength of concrete [20]. Cemalgil and Onat [21] investigated the effect of using waste marble aggregate and waste demolition materials in the concrete mixture on the engineering properties of concrete.…”

The Engineering behavior and the Properties of Phosphorit and Gypsum on the Resistance strength of Concrete

“…So as to actuate the adequate measure of Phosphorite wastes mixture that has associate degree improvement in the masonry group [4], and concrete properties, the masonry samples were divided into five classifications according to the ratio of Phosphorite wastes and Gypsum to cement. Each category, six cube specimens were prepared and tested [10].…”

“…Gypsum is teeming material accessible within the earth, that is a lot of a mineral that's scattered in nature with one in every of its gilded forms or matter rocks. Its presence on the surface of the world or at depths up to 350m Gypsum is salt mineral composed of calcium sulphate dehydrate, with the statement CaSO4 • 2H2O [1,2,3,4,5]. The results showed that replacing of cement by Phosphorite residues and gypsum increased the strength of masonry sample (MGPC-25%) by (42%).…”