Strength, durability and micro-structural assessment of slag-agro blended based alkali activated engineered geopolymer composites

Yaswanth, K. K.; Revathy, J.; Gajalakshmi, P.

doi:10.1016/j.cscm.2022.e00920

Cited by 17 publications

(5 citation statements)

References 36 publications

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“…The Figure 9 (b) shows the EDXS spectrum of mix M2 with 5% RHA. It shows the remarkable amount of Si, Al, O and Ca elements with less amount of Na; confirm the better formation of the gel (27) . At ambient temperature combination of GGBFS and RHA develops the dense microstructure with good quality of geopolymer gel.…”

Section: Results Of Scanning Electron Microscopic Analysis With Edx S...mentioning

confidence: 57%

“…The mix M1 with 100% GGBFS was observed to achieve gain of strength of 6.59%, 11.16% and 18.96% from 3 days to 7 days, 7 days to 28 days and 3 days to 28 days respectively. In GGBFS based mix heat is generated due to exothermic reaction of CaO which accelerates the geopolymerization and hence higher strength development at 3 days (23,27) . About 80% strength of 28 days was achieved within 3 days in 100% GGBFS mix.…”

Section: Results Of Compressive Strength Testmentioning

confidence: 99%

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Workability and Compressive Strength of Self-Compacting Geopolymer Concrete Blended with Industrial and Agricultural Waste

Patel¹,

Shah²

2023

IJST

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Objectives: To investigate the effect of replacement of Rice Husk Ash (RHA) on the workability and compressive strength of Self Compacting Geopolymer Concrete (SCGC) blended with Ground Granulated-Blast Furnace Slag (GGBFS) for sustainable environment. Methods: GGBFS as an industrial waste and RHA as an agricultural waste were used as an aluminosilicate source materials for the development of SCGC. Use of RHA is popular for their considerable effects on the mechanical as well as microstructural properties of cement based binders as well as geopolymer binders. The SCGC mixes were prepared by replacing GGBFS with RHA at various proportions of 5%, 15% and 25%. The fresh properties of SCGC have assessed through "Slump Flow, V-funnel, L-Box and J-Ring test methods as per EFNARC" guidelines. Findings: Partial replacement of RHA decreases the workability. Replacement of RHA in SCGC beyond 5% reduces the compressive strength, yet the target strength (30MPa) of all mixes were achieved. SEM analysis with EDXS spectra shows the dense microstructure of optimum mix with 5% RHA replacement. The 28 days strength of 42.6 MPa for 5% RHA, 39.31MPa for 15% RHA and 31.59 MPa for 25% RHA were achieved at ambient temperature, which is 110%, 94% and 56% higher than control mix strength (MF-100% FA) at ambient temperature. Novelty: SCGC is a new concrete which fulfill the properties of both Geopolymer (GPC) and Self Compacting Concrete (SCC). Most of the investigations in SCGC have been performed using Fly Ash, Metakeoline, and GGBFS as a binder. In this experimental study, GGBFS as an industrial waste and RHA as an agricultural waste are used as source material to develop the SCGC.

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Section: Results Of Scanning Electron Microscopic Analysis With Edx S...mentioning

confidence: 57%

Section: Results Of Compressive Strength Testmentioning

confidence: 99%

Workability and Compressive Strength of Self-Compacting Geopolymer Concrete Blended with Industrial and Agricultural Waste

Patel¹,

Shah²

2023

IJST

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“…The densities of the high-strength date palm, steel, and polypropylene fibrous concrete might be predicted utilizing the following equations. 𝛾 𝑑 = −22.71𝑉 𝑓𝑑 + 2520.41 (10) 𝛾 𝑠 = 57.75𝑉 𝑓𝑠 + 2528.52 (11) 𝛾 𝑝 = −52.25𝑉 𝑓𝑝 + 2514.18 (12) where γd, γs, and γp are the density of the high-strength date palm, steel, and PPFs, respectively. The correlation between the density of high-strength concrete and volume fractions of date palm, steel, and polypropylene fibers is represented in Figure 11.…”

Section: Density Of Concretementioning

confidence: 99%

“…Further, waste materials might be reprocessed and reused to advance other valuable materials [6][7][8]. Infrastructure construction materials, particularly concrete, have been integrated with waste materials as critical components for several years [9][10][11]. Numerous studies have incorporated waste materials into concrete, such as gravel aggregates substituted by plastics [12], rubber [13], bottle glass [14], and recycled concrete aggregates [15].…”

Section: Introductionmentioning

confidence: 99%

Behavior of Concrete Reinforced with Date Palm Fibers

et al. 2022

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In recent decades, researchers have begun to investigate innovative sustainable construction materials for the development of greener and more environmentally friendly infrastructures. The main purpose of this article is to investigate the possibility of employing date palm tree waste as a natural fiber alternative for conventional steel and polypropylene fibers (PPFs) in concrete. Date palm fibers are a common agricultural waste in Middle Eastern nations, particularly Saudi Arabia. As a result, this research examined the engineering properties of high-strength concrete using date palm fibers, as well as the performance of traditional steel and PPF concrete. The concrete samples were made using 0.0%, 0.20%, 0.60%, and 1.0% by volume of date palm, steel, and polypropylene fibers. Ten concrete mixtures were made in total. Compressive strength, flexural strength, splitting tensile strength, density, ultrasonic pulse velocity (UPV), water absorption capability, and water permeability tests were performed on the fibrous-reinforced high-strength concrete. With a 1% proportion of date palm, steel, and polypropylene fibers, the splitting tensile strength improved by 17%, 43%, and 16%, respectively. By adding 1% fiber, flexural strength was increased by 60% to 85%, 67% to 165%, and 61% to 79%. In addition, date palm fibers outperformed steel and PPFs in terms of density, UPV, and water permeability. As a result, date palm fibers might potentially be employed in the present construction sector to improve the serviceability of structural elements.

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“…Durability and mechanical performance are the essential requisites for applying zero cement-based alkali-activated geopolymer materials incorporating industrial/agricultural wastes (such as fly ash, slag, rice husk ash, palm oil fuel ash, bagasse ash, recycled materials, etc.) as precursors in green sustainable construction [1][2][3][4][5][6]. The design parameters (reagent ratio, reagent molarity, etc.)…”

Section: Introductionmentioning

confidence: 99%

Shrinkage, Permeation and Freeze–Thaw Characteristics of Ambient Cured High Calcium-Based Alkali-Activated Engineered Composites

Hossain,

Sood

2023

Materials

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Sustainable zero cement-based one-part ambient cured alkali-activated engineered composites (AAECs) are developed. The durability and microstructural characteristics of developed AAECs using 2% v/v polyvinyl alcohol (PVA) fibers, silica sand, binary or ternary combinations of precursors (fly ash class C ‘FA-C’, fly ash class F ‘FA-F’ and ground granulated blast furnace slag ‘GGBFS’) and two types of powder form alkaline reagents (Type 1 and Type 2) are evaluated compared to conventional engineered cementitious composites (ECCs) and alkali-activated mortars (AAMs) without fiber. AAECs developed satisfactory compressive strength ranging from 34 MPa to 46 MPa. Expansion/shrinkage and mass change (loss/gain) behaviors are affected by binary/ternary combination of source materials, reagent types and curing regimes (water or ambient) for both AAMs and AAECs. The binary (FA-C + GGBFS) and reagent 2 (calcium hydroxide + sodium sulfate) composites demonstrated lower shrinkage due to formation of crystalline C-A-S-H/C-S-H binding phases than their ternary (FA-C + FA-F + GGBFS) and reagent 1 (calcium hydroxide + sodium metasilicate) counterparts which formed amorphous N-C-A-S-H/N-A-S-H phases. The matrix densification due to the formation of reaction products and fiber-induced micro-confinement leads to lower shrinkage and mass change of AAECs compared to their AAM counterparts. Composites exhibited lower or comparable secondary sorptivity indices compared to control ECC, indicating their superior permeation performance. All AAECs had a relative dynamic modulus of elasticity (RDME) greater than 90% at 300 cycles (comparable to control ECC), exhibiting satisfactory freeze–thaw resistance with reagent 2 mixes showing better performance compared to those with reagent 1. The production feasibility of strain hardening AAECs with powder form reagents having satisfactory mechanical and durability properties is confirmed.

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Strength, durability and micro-structural assessment of slag-agro blended based alkali activated engineered geopolymer composites

Cited by 17 publications

References 36 publications

Workability and Compressive Strength of Self-Compacting Geopolymer Concrete Blended with Industrial and Agricultural Waste

Workability and Compressive Strength of Self-Compacting Geopolymer Concrete Blended with Industrial and Agricultural Waste

Behavior of Concrete Reinforced with Date Palm Fibers

Shrinkage, Permeation and Freeze–Thaw Characteristics of Ambient Cured High Calcium-Based Alkali-Activated Engineered Composites

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