Mechanical performance and durability of geopolymer lightweight rubber concrete

Youssf, Osama; Elchalakani, Mohamed; Hassanli, Reza; Roychand, Rajeev; Zhuge, Yan; Mills, Julie E.

doi:10.1016/j.jobe.2021.103608

Cited by 33 publications

(27 citation statements)

References 41 publications

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“…The interest in the use of alkali-activated materials (binders produced by the alkali activation of reactive solid precursors [4]) for water and wastewater treatment is recent, despite their obvious suitability to act as adsorbents [5,6], endowed by their intrinsic nano-and micro-porosity [7], and their negatively charged framework balanced by cations that can be exchanged for other cations [8] present in wastewaters [9,10]. Other technical advantages over benchmark adsorbents (e.g., activated carbons) are the possibility of being produced at room temperature, and the use of various waste streams or by-products as precursors [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

et al. 2022

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In this work, alkali-activated fly ash-derived foams were produced at room temperature by direct foaming using aluminum powder. The 1 cm3 foams (cubes) were then evaluated as adsorbents to extract heavy metals from aqueous solutions. The foams’ selectivity towards lead, cadmium, zinc, and copper ions was evaluated in single, binary, and multicomponent ionic solutions. In the single ion assays, the foams showed much higher affinity towards lead, compared to the other heavy metals; at 10 ppm, the removal efficiency reached 91.9% for lead, 83.2% for cadmium, 74.6% for copper, and 64.6% for zinc. The greater selectivity for lead was also seen in the binary tests. The results showed that the presence of zinc is detrimental to cadmium and copper sorption, while for lead it mainly affects the sorption rate, but not the ultimate removal efficiency. In the multicomponent assays, the removal efficiency for all the heavy metals was lower than the values seen in the single ion tests. However, the superior affinity for lead was preserved. This study decreases the existing knowledge gap regarding the potential of alkali-activated materials to act as heavy metals adsorbents under different scenarios.

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Section: Introductionmentioning

confidence: 99%

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

et al. 2022

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“…GC uses no cement, but uses silica-alumina rich materials instead, which are industry by-product materials. This significantly reduces the demand of cement and the associated carbon footprint [ 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Geopolymer Concrete with Lightweight Fine Aggregate: Material Performance and Structural Application

et al. 2022

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Limited information and data are available on the material and structural performance of GC incorporating lightweight fine aggregate. In this research, three types of lightweight fine materials were utilized to partially replace sand volume of GC. These lightweight materials were rubber, vermiculite, or lightweight expanded clay aggregate (LECA) and they were used in contents of 20%, 40%, 60%, and 100%. The variables were applied to better investigate the efficiency of each lightweight material in GC and to recommend GC mixes for structural applications. The concrete workability, compressive strength, indirect tensile strength, freezing and thawing performance, and impact resistance were measured in this study. In addition, three reinforced concrete slabs were made from selected mixes with similar compressive strength of 32 MPa and then tested under a 4-point bending loading regime. The results showed that using LECA as sand replacement in GC increased its compressive strength at all ages and all replacement ratios. Compared with the control GC mix, using 60% LECA increased the compressive strength by up to 44%, 39%, and 27%, respectively at 3, 7, and 28 days. The slabs test showed that partial or full replacement of GC sand adversely affected the shear resistance of concrete and caused premature failure of slabs. The slab strength and deflection capacities decreased by 9% and 30%, respectively when using rubber, and by 23% and 59%, respectively when using LECA, compared with control GC slab. The results indicated the applicability of GC mix with 60% LECA in structures subjected to axial loads. However, rubber would be the best lightweight material to recommend for resisting impact and flexural loads.

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“…However, these methods will inevitably have an impact on the ecological environment such as groundwater, formation soil, and atmosphere. Therefore, the management of scrap tires has become a growing problem [4][5][6]. It is estimated that by the end of 2030, the world will generate 1.2 billion scrap tires annually [7].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Test and Meso-Model Numerical Study of Composite Rubber Concrete under Salt-Freezing Cycle

Sun¹,

Wang²,

Jiang³

et al. 2023

Journal of Renewable Materials

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A composite rubber concrete (CRC) was designed by combining waste tire rubber particles with particle sizes of 3~5 mm, 1~3 mm and 20 mesh. Taking the rubber content of different particle sizes as the influencing factors, the range and variance analysis of the mechanical and impermeability properties of CRC was carried out by orthogonal test. Through analysis, it is concluded that the optimal proportion of 3~5 mm, 1~3 mm, and 20 mesh particle size composite rubber is 1:2.5:5. 5 kinds of CRC and 3 kinds of ordinary single-mixed rubber concrete (RC) with a total content of 10%~20% were designed under this ratio, and the salt-freezing cycle test was carried out with a concentration of 5% Na 2 SO 4 solution. The physical and mechanical damage laws during 120 salt-freezing cycles are obtained, and the corresponding damage prediction model is established according to the experimental data. The results show that: on the one hand, the composite rubber in CRC produces a more uniform "graded" structure, forms a retractable particle group, and reduces the loss of mechanical properties of CRC. On the other hand, colloidal particles with different particle sizes are used as air entraining agent to improve the pore structure of concrete and introduce evenly dispersed bubbles, which fundamentally improves the durability of concrete. Under the experimental conditions, the CRC performance is the best when the overall content of composite rubber is 15%.

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Mechanical performance and durability of geopolymer lightweight rubber concrete

Cited by 33 publications

References 41 publications

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

Geopolymer Concrete with Lightweight Fine Aggregate: Material Performance and Structural Application

Mechanical Test and Meso-Model Numerical Study of Composite Rubber Concrete under Salt-Freezing Cycle

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