Effects of the mechanical milling method on transport properties of self-compacting concrete containing perlite powder as a supplementary cementitious material

Karein, S. Mahmoud Motahari; Joshaghani, Alireza; Ramezanianpour, Ali Akbar; Isapour, Soroush; Karakouzian, Moses

doi:10.1016/j.conbuildmat.2018.03.205

Cited by 35 publications

(14 citation statements)

References 43 publications

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“…To the purpose, after RWPG/cement specimen preparation (RWPG sample), thermal conductivities exceeding 0.30 Wm −1 K −1 and compression strengths exceeding 12.4 Nmm −2 were observed (Figure 9B). A porous alumosilicate aggregate as perlite (the porous structure is showed in the SEM image of the Figure 9A inset) was added in order to give higher mechanical resistances [63,64] to the conglomerates. As ion exchanger, perlite may be also used after heavy metals exhaustion [65].…”

Section: Resultsmentioning

confidence: 99%

Porous Waste Glass for Lead Removal in Packed Bed Columns and Reuse in Cement Conglomerates

et al. 2018

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A porous waste glass (RWPG = recycled waste porous glass) was used in wastewater treatments for the removal of lead ions from single, binary, and ternary metal solutions (with cadmium and nickel ions). Experiments were performed in columns (30 cm3, 10 g) filled with 0.5–1 mm beads till complete glass exhaustion (breakthrough). In the case of single and binary solutions, the columns were percolated at 0.2 Lh−1 (2 mg Me+2 L−1); in the case of ternary solutions, the columns were percolated at 0.15–0.4 Lh−1 (2 mg Me2+ L−1) and with 2–5 mg Me2+ L−1 influent concentration (0.2 Lh−1). Lead ions were removed mainly by ion exchange and also by adsorption. From a kinetic point of view, the rate controlling step of the process was the interdiffusion of the lead ions in the Nernst stationary liquid film around the sorbent. The uptake of the metals and the glass selectivity were confirmed by Energy Dispersive X-ray spectroscopy (EDX) analysis. After lead retention process, glass beads were reused as lightweight aggregates for thermal insulating and environmental safe mortars.

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Section: Resultsmentioning

confidence: 99%

Porous Waste Glass for Lead Removal in Packed Bed Columns and Reuse in Cement Conglomerates

et al. 2018

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“…Based on the specifications, a longer V-funnel flow time indicates a flowable concrete with greater viscosity. Moreover, those mixtures with shorter V-funnel flow times (i.e., low viscosities) are prone to having segregation [33]. As shown in Figure 10 with a dashed line, using waste aggregates increased the V-funnel flow time of flowable concrete; thus, the viscosity of SCC would be increased.…”

Section: Mechanical Testsmentioning

confidence: 98%

Towards Eco-Flowable Concrete Production

2020

Self Cite

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Environmental concerns have increased due to the amount of unused/expired plastic medical waste generated in hospitals, laboratories, and other healthcare facilities, in addition to the fact that disposing of such wastes with extremely low degradation levels causes them to remain in the environment for extended periods of time. These issues have led researchers to develop more environmentally friendly alternatives for disposing of plastic medical waste in Australia. This study is an attempt to assess the impacts of using expired plastic syringes as fine aggregate on fresh and hardened characteristics of flowable concrete, which might provide a solution to environmental concerns. Six mixtures of flowable concrete with water-to-cement ratios of 0.38 were studied. It was found that using recycled aggregate in up to 20% can improve the workability and increase the V-funnel values of flowable concrete mixtures. However, using waste aggregates in more than 30% caused an inapt flowability. Adding waste aggregate at the 30%–50% replacement level led to a decrease in the L-box ratio. To verify the utility and the efficacy of this experiment, the connections between different rheological test measurements were also compared by implementing the Pearson correlation function. The mechanical properties of the mixes containing recycled aggregates were decreased at the age of seven days; however, at later ages, waste aggregates increased the strength at the 10%–30% replacement levels.

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“…Despite the slump, flow and V-funnel time are not changed significantly by adding WPP; the fresh properties considered as negatively affected when WPP added for both recycled and natural aggregate concrete. Where the required amounts of superplasticizer have been increased considerably, this reduction in workability might be due to the high surface area of WPP and its absorption capacity [26,27]. The WPP does not affect the V-funnel time because WPP consumes longer time to absorb water due to its special amorphous, as well as its particles are relatively small comparing to UWFA and WCCP.…”

Section: Slump Flow and V-funnelmentioning

confidence: 99%

Fresh properties of the selfcompacting high-performance concrete using recycled concrete aggregate

Abed¹,

Nemes²

2019

Epitoanyag - JSBCM

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The present study is investigating the fresh properties of the self-compacting high-performance concrete (SCHPC) using recycled concrete aggregate and waste powder materials. Twenty-one mixtures with the same water to binder ration have been tested for both slump flow and V-funnel tests. Their results shows that using recycled concrete aggregate (RCA) up to 50% is not affecting the workability of SCHPC if the water absorption of RCA is compensated, however, waste powder materials are affecting the fresh properties negatively and demanded higher dosage of chemical admixture. Their effect differentiates depending on the grading and particles properties of the waste powder material. The workability results of SCHPC using recycled aggregate and waste powder materials are satisfying the workability process of normal SCC, which is specified in the European Guideline for Self-compacting Concrete regulations (EFNARC).

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Effects of the mechanical milling method on transport properties of self-compacting concrete containing perlite powder as a supplementary cementitious material

Cited by 35 publications

References 43 publications

Porous Waste Glass for Lead Removal in Packed Bed Columns and Reuse in Cement Conglomerates

Porous Waste Glass for Lead Removal in Packed Bed Columns and Reuse in Cement Conglomerates

Towards Eco-Flowable Concrete Production

Fresh properties of the selfcompacting high-performance concrete using recycled concrete aggregate

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