Thermal and mechanical characterization of fly ash geopolymer with aluminium chloride and potassium hydroxide treated hemp shiv lightweight aggregate

Narattha, Chalermphan; Wattanasiriwech, Suthee

doi:10.1016/j.conbuildmat.2022.127206

Cited by 15 publications

(3 citation statements)

References 61 publications

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“…In Figure 15, the TCs of the LWC produced in this study are presented alongside those reported in other studies involving LWC made of OPC and geopolymer binders, employing different types of aggregates. These aggregates include PA, 8,10,11,28,35–38 expanded perlite, 29,39–41 expanded polystyrene, 11,42,43 diatomite, 37,44 vermiculite, 43,45 foaming agent, 46–48 oil palm shell, 27 expanded clay, 36,49 expanded shale, 36 sawdust, 50 hemp shiv, 51 cenosphere, 52 ethyl vinyl acetate, 53 clay brick, 28 expanded glass, 29 ceramic microspheres, 29 plastic bead, 25 and bottom ash 54 …”

Section: Discussionmentioning

confidence: 99%

Thermal and mechanical performance of lightweight geopolymer concrete with pumice aggregate

Jamal,

Bzeni,

Shi

2023

Structural Concrete

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This study aims to prepare and assess the mechanical characteristics of fly ash (FA)‐based lightweight geopolymer concrete (LWGPC) utilizing pumice as a coarse aggregate. A comprehensive set of 16 LWGPC mixtures were synthesized. The first twelve mixtures produced with varying alkaline to FA ratio and varying proportions of coarse aggregates. The mixture proportion that has given the highest compressive strength (CS), was selected to create four other LWGPC mixes with water‐to‐solid ratios (w/s) ranging from 0.17 to 0.23. Fresh and mechanical properties as well as thermal conductivity (TC) of the LWGPC samples were examined. The experimental findings indicate an inverse relationship between the w/s ratio and mechanical properties of LWGPC samples. Notably, the mechanical properties attain their highest values at the lowest w/s ratio, primarily attributed to reduced porosity and higher concentration of alkali solution in the mixtures with lesser water content. The LWGPC achieved highest CS of 13 MPa, modulus of elasticity (ME) of 8.8 GPa, flexural strength (FS) of 2.2 MPa, and tensile splitting strength (TSS) of 1.64 MPa. The oven dry density (ODD) and TC values ranged from 1746 to 1815 kg/m3 and 0.119 to 0.131 W/m K, respectively. A low‐cost and eco‐friendly novel lightweight concrete composition with low TC was developed.

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Section: Discussionmentioning

confidence: 99%

Thermal and mechanical performance of lightweight geopolymer concrete with pumice aggregate

Jamal,

Bzeni,

Shi

2023

Structural Concrete

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“…Cement and aggregates have been substituted with industrial and agro-industrial wastes to produce cheaper concrete brick while preserving natural resources and properly managing solid waste. The hemp used in concrete brick 18 . Similar concrete brick was made from rice husk (RH), fly ash (FA), and hydrated lime (HL) were among the industrial and agricultural wastes that had potential substitutes for aggregate and cement.…”

Section: Introductionmentioning

confidence: 99%

Soft computing techniques for predicting the properties of raw rice husk concrete bricks using regression-based machine learning approaches

Ganasen,

Krishnaraj,

Onyelowe

et al. 2023

Sci Rep

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In this study, the replacement of raw rice husk, fly ash, and hydrated lime for fine aggregate and cement was evaluated in making raw rice husk-concrete brick. This study optimizes compressive strength, water absorption, and dry density of concrete brick containing recycled aggregates via Response Surface Methodology. The optimized model's accuracy is validated through Artificial Neural Network and Multiple Linear Regression. The Artificial Neural Network model captured the 100 data's variability from RSM optimization as indicated by the high R threshold- (R > 0.9997), (R > 0.99993), (R > 0.99997). Multiple Linear Regression model captured the data's variability the decent R2 threshold confirming- (R2 > 0.9855), (R2 > 0.9768), (R2 > 0.9155). The raw rice husk-concrete brick 28-day compressive strength, water absorption, and density prediction were more accurate when using Response Surface Methodology and Artificial Neural Network compared to Multiple Linear Regression. Lower MAE and RMSE, coupled with higher R2 values, unequivocally indicate the model's superior performance. Additionally, employing sensitivity analysis, the influence of the six input parameters on outcomes was assessed. Machine learning aids efficient prediction of concrete's mechanical properties, conserving time, labor, and resources in civil engineering.

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“…One such alternative material is bio-based building composites (Jones & Brischke, 2017) (also referred as bio-aggregate composites (Williams et al, 2018) or agro-concretes (Amziane, 2016) in which plant-based materials such as bagasse (Hernández-Olivares et al, 2020), bamboo (Ghavami, 2005), coconut (Kanojia & Jain, 2017), cork (Panesar & Shindman, 2012), corn stalk (Ahmad & Chen, 2020), flax (Benmahiddine et al, 2020), hemp (Jami et al, 2016), lavender (Ratiarisoa et al, 2016), palm shell (Huda et al, 2016), sunflower (Wadi et al, 2019), or wheat straw (Petrella et al, 2019) have been used as aggregate and mixed with a mineral binder such as cement (Çomak et al, 2018;da Gloria et al, 2021;Gourlay et al, 2017;Sedan et al, 2008), lime (Williams et al, 2017), hydraulic lime (Youssef et al, 2015), various pozzolans (Dinh et al, 2012;Walker & Pavia, 2012) or combination of these (Barbieri et al, 2020;Rahim et al, 2016). In recent years, there is a growing interest on the use of geopolymer binders for the production of plant-based composites (Korniejenko et al, 2018;Narattha et al, 2022;Sáez-Pérez et al, 2021). Among these, hemp-based composites (hempcrete, hemp-lime composites or hemp concretes) have gained increasing interest owing to the high strength and durability of hemp stems since the development of hemp composites at the beginning of 19th century.…”

Section: Introductionmentioning

confidence: 99%

Influence of hemp shiv, cement, and water content on the properties of lightweight hemp composites produced using different sizes of hemp shiv

Şahin

2022

rdlc

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This study investigated the production and properties of lightweight hemp composites produced using waste industrial hemp stems cultivated in Turkey. Hemp stems were separated from their fibers and fragmented to obtain hemp shiv aggregates in the laboratory. Twelve mixtures were prepared with varied volumetric ratios of hemp: cement (H:C) and hemp: water (H: W) using different sizes of hemp shiv. The influence of mix proportions on the physical and mechanical properties of hemp composites were investigated. Besides, microstructure of hemp composites was examined. The hemp composites produced were in the apparent density range of 312 to 928 kg/m3 and exhibited 0.20 to 1.24 MPa compressive strength. The water absorptions of samples were in the range of 3.47 and 8.50 kg/m2.h1/2. The apparent density and compressive strength of hemp composites decreased with the increase of H:C ratio, but this situation is the opposite for increase of H: W ratio and hemp shiv size. Besides, increase in H:C ratio or hemp shiv size caused higher water absorptions.

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Thermal and mechanical characterization of fly ash geopolymer with aluminium chloride and potassium hydroxide treated hemp shiv lightweight aggregate

Cited by 15 publications

References 61 publications

Thermal and mechanical performance of lightweight geopolymer concrete with pumice aggregate

Thermal and mechanical performance of lightweight geopolymer concrete with pumice aggregate

Soft computing techniques for predicting the properties of raw rice husk concrete bricks using regression-based machine learning approaches

Influence of hemp shiv, cement, and water content on the properties of lightweight hemp composites produced using different sizes of hemp shiv

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