Effect of Porosity and Water Absorption on Compressive Strength of Fly Ash based Geopolymer and OPC Paste

Razak, S. M. S. A.; Zainal, Farah Farhana; Shamsudin, Shaiful Rizam

doi:10.1088/1757-899x/957/1/012035

Cited by 21 publications

(17 citation statements)

References 6 publications

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“…Siti Aisyah et al (2020), when studying the effect of porosity and water absorption on compressive strength, finds that the fly ash-based geopolymer with lower porosity has the high compressive strength while the OPC with higher porosity has lower compressive strength [22].…”

Section: Results Of Porosimetric Tests By the Bjh Methods Of The Soilmentioning

confidence: 99%

Microstructure of Fine Clay Soils Stabilized with Sugarcane Molasses

Malanda¹,

Mfoutou²,

Madila³

et al. 2022

OJCE

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Sugar cane molasses has proved cohesive and excellent performance on soil aggregates (fine particles). However, the microstructure of consolidated soil by the molasses is not yet subjected to research. The analysis results of sample without molasses (0%) and consolidated samples at 8%, 12%, and 16% show that the molasses acts on the structure of clayey fine soil developing its microstructure of airy matrix type (sample without molasses (0%) to a microstructure of a qualified type, more solid. Consolidated samples to 8%, 12%, 16% of molasses). We also observe the presence of inter-aggregate pores (mesopores) of similar size in all samples. The results of porosimetrical analyses (BJH) of the sample without molasses and consolidated samples to 8%, 12%, and 16% show that simultaneous porous volumes of samples are reduced with the increasing of molasses quantity. This latter, therefore, acts on the porous volume (micropore < 2 nm and mesopore < 9 nm) by reducing them which really means, molasses occupies the porous volume of the sample. However, this sample seems not to have any effect on the size of mesopores 9 nm. Thus, this product induces the evolution of the soil structure towards the highly dense and condensed structure. Consequently, materials in consolidated soil by molasses will have mechanical properties far superior to those of materials consolidated soil without molasses.

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Section: Results Of Porosimetric Tests By the Bjh Methods Of The Soilmentioning

confidence: 99%

Microstructure of Fine Clay Soils Stabilized with Sugarcane Molasses

Malanda¹,

Mfoutou²,

Madila³

et al. 2022

OJCE

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“…Razak et al [ 73 ] considered the same curing pre-treatment (ambient temperature for 24 h after casting) to evaluate the mechanical performance of FA-based geopolymeric and Portland pastes of fixed composition. The higher mechanical strength found in geopolymer material was also justified in this case by the different microstructural characteristics of the binders under study.…”

Section: Geopolymer Vs Ordinary Pc Mixes: a Comparative Analysismentioning

confidence: 99%

“… Comparison between Portland and geopolymer mixes in terms of strength properties [ 72 , 73 , 74 , 76 , 77 ]. …”

Section: Figurementioning

confidence: 99%

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

2021

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In the direction of reducing greenhouse emissions and energy consumption related to the activities of the cement and concrete industry, the increasingly popular concept of eco-sustainability is leading to the development and optimization of new technologies and low impact construction materials. In this respect, geopolymers are spreading more and more in the cementitious materials field, exhibiting technological properties that are highly competitive to conventional Portland concrete mixes. In this paper, the mix design, mechanical properties, microstructural features, and mineralogical properties of geopolymer mixes are discussed, investigating the influence of the main synthesis parameters (curing regime, type of precursors, activator molarity, mix design) on the performance of the final product. Moreover, recent developments of geopolymer technology based on the integration of functional nanofillers are reported. The novelty of the manuscript is to provide a detailed collection of past and recent comparative studies between geopolymers and ordinary Portland concrete mixes in terms of strength properties, durability, fire resistance, and environmental impact by LCA analysis, intending to evaluate the advantages and limitations of this technology and direct research towards a targeted optimization of the material.

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“…The study found that the steel-fiber-reinforced geopolymer concrete had 13.4% higher compressive strength compared to the OPC concrete [97]. Moreover, the geopolymer mortar carries more compressive strength than OPC paste, as experimentally studied by Razak et al [98]. It was concluded that the fly-ash-based geopolymer paste possesses more resistance to aggressive environments and compressive strength than OPC.…”

Section: Materials Behaviormentioning

confidence: 88%

Structural Performance of Energy Efficient Geopolymer Concrete Confined Masonry: An Approach towards Decarbonization

et al. 2023

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Geopolymer concrete is preferred over OPC due to its use of energy waste such as fly ash, making it more sustainable and energy-efficient. However, limited research has been done on its seismic characterization in confined masonry, highlighting a gap in sustainable earthquake-resistant structures. Our study compares the performance of alkali-activated fly-ash-based geopolymer concrete bare frame and confined masonry wall panels with conventional concrete. Experimental results showed that geopolymer concrete bare frame has 3.5% higher initial stiffness and 1.0% higher lateral load-bearing capacity compared to conventional concrete. Geopolymer concrete confined masonry exhibited 45.2% higher initial stiffness and 4.1% higher ultimate seismic capacity than traditional concrete. The experimental results were verified using a numerical simulation technique with ANSYS-APDL, showing good correlation. Comparison with previously tested masonry walls revealed that GPC confined masonry has similar structural behavior to cement concrete masonry. This study demonstrates that geopolymer concrete made from waste energy such as fly ash is a sustainable and low-energy substitute for OPC concrete, particularly in highly seismic-prone areas, for a cleaner environment.

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Effect of Porosity and Water Absorption on Compressive Strength of Fly Ash based Geopolymer and OPC Paste

Cited by 21 publications

References 6 publications

Microstructure of Fine Clay Soils Stabilized with Sugarcane Molasses

Microstructure of Fine Clay Soils Stabilized with Sugarcane Molasses

Geopolymers vs. Cement Matrix Materials: How Nanofiller Can Help a Sustainability Approach for Smart Construction Applications—A Review

Structural Performance of Energy Efficient Geopolymer Concrete Confined Masonry: An Approach towards Decarbonization

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