Impact of added water and superplasticizer on early compressive strength of selected mixtures of palm oil fuel ash-based engineered geopolymer composites

Salami, Babatunde Abiodun; Johari, Megat Azmi Megat; Ahmad, Zainal Arifin; Maslehuddin, Mohammed

doi:10.1016/j.conbuildmat.2016.01.033

Cited by 51 publications

(7 citation statements)

References 27 publications

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“…The good bonding between the PVA fibres and POFA binder matrix was seen through the revelation of a well formed homogenous and uniform microstructure as shown in the monographs. This is a result of a strong interaction of the PVA fibres with polar solvents (water in this case) through the existence of hydrogen and hydroxyl bonding from water and alkalidominating internal structure of POFA binder (Salami et al 2016). Relatively low compressive strength was recorded, which increases with increase in NaOH (aq) molarity.…”

Section: Sem/eds Analysis 351 Microstructure Of the Unexposed (Contmentioning

confidence: 99%

“…As a result, alkaliactivated binder development needs materials like Palm oil fuel ash (POFA) with no economic value posing environmental and social risks to people. POFA have been used wholly (Salami et al 2016(Salami et al , 2017 and partially Yusuf et al 2014a) in the development of alkali-activated mortar and concrete. The reality of the durability performance of alkaliactivated binder is dependent on the source material used and the concentration of exposure acids.…”

Section: Introductionmentioning

confidence: 99%

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POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Salami

Johari

Ahmad

et al. 2017

ACT

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The durability performance of palm oil fuel ash engineered alkali-activated cementitious composite (POFA-EACC) mortar exposed to different acid solutions is assessed in this study. 50 mm cubic specimens used for the study were prepared from 100% POFA, alkali-activator (Na 2 SiO 3(aq) /NaOH (aq) ) ratios of 2.5, different molarities (10, 12 and 14 M) of NaOH (aq) and 2% volume fraction of polyvinyl alcohol (PVA) fibres. Specimens were exposed to 10% H 2 SO 4(aq) , 10% HNO 3(aq) and 10% HCl (aq) at pH of 0.56, 0.52 and 0.42 respectively for 3, 6 and 9 months, with unexposed specimens as control. Small changes in compressive strength were identified with POFA mortar specimens during exposure to H 2 SO 4(aq) , while exposure to HNO 3(aq) and HCl (aq) greatly reduced the strength of the POFA mortar specimens. The results were supported through microstructural examinations using SEM, while the characterization was done using XRD and FTIR. The high resistance of POFA-EACC mortar to H 2 SO 4(aq) is the contribution received through the formation of gypsum, which hinders the infiltration of more acids into the matrix microstructure.

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Section: Sem/eds Analysis 351 Microstructure Of the Unexposed (Contmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Salami

Johari

Ahmad

et al. 2017

ACT

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“…Furthermore, several applications and standardization of AAM are being done in Russia, Ukraine, South Africa, Netherlands, UK, and the USA, among others [ 13 , 14 , 15 ]. Many researchers have successfully synthesized alkali-activated mortars and concretes experimentally from natural raw materials, such as natural pozzolan (NP) [ 9 , 16 , 17 ], agricultural waste materials, such as rice husk ash [ 18 ], palm oil fuel ash (POFA) [ 18 , 19 , 20 , 21 , 22 ], or industrial waste, such as silico-manganese slag (SiMn) [ 23 ], ground granulated blast furnace slag (GGBFS) [ 23 , 24 , 25 ], fly ash (FA) [ 26 ], silica fume (SF) [ 26 , 27 ], coal bottom ash [ 28 ], paper sludge ash [ 29 ], and mine tails [ 8 ] with aluminosilicate components.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Modelling of Alkali-Activated Mortar Compressive Strength Using Hybrid Support Vector Regression and Genetic Algorithm

et al. 2021

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This paper presents the outcome of work conducted to develop models for the prediction of compressive strength (CS) of alkali-activated limestone powder and natural pozzolan mortar (AALNM) using hybrid genetic algorithm (GA) and support vector regression (SVR) algorithm, for the first time. The developed hybrid GA-SVR-CS1, GA-SVR-CS3, and GA-SVR-CS14 models are capable of estimating the one-day, three-day, and 14-day compressive strength, respectively, of AALNM up to 96.64%, 90.84%, and 93.40% degree of accuracy as measured on the basis of correlation coefficient between the measured and estimated values for a set of data that is excluded from training and testing phase of the model development. The developed hybrid GA-SVR-CS28E model estimates the 28-days compressive strength of AALNM using the 14-days strength, it performs better than hybrid GA-SVR-CS28C model, hybrid GA-SVR-CS28B model, hybrid GA-SVR-CS28A model, and hybrid GA-SVR-CS28D model that respectively estimates the 28-day compressive strength using three-day strength, one day-strength, all the descriptors and seven day-strength with performance improvement of 103.51%, 124.47%, 149.94%, and 262.08% on the basis of root mean square error. The outcome of this work will promote the use of environment-friendly concrete with excellent strength and provide effective as well as efficient ways of modeling the compressive strength of concrete.

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“…AAM has emerged as a new alternative binder to OPC due to its lower environmental impact, excellent strength development, good thermal resistance, innocuity to alkaline-aggregate reactions and low permeability [6][7][8]. The synthesis of alkali-activated binders using the world's vast deposit of natural pozzolan (NP) [9][10][11], rice husk ash [12], palm oil fuel ash (POFA) [12][13][14][15][16], silico-manganese slag [17], ground granulated blast furnace slag [17][18][19], fly ash [20], and silica fume [20,21] will contribute to waste valorisation, dumpsite land reclamation, and a reduction in the environmental hazards. AAM is gaining a wide range of applications in precast concrete and for in-situ construction.…”

Section: Introductionmentioning

confidence: 99%

“…Quite a lot of work on the synthesis of AAMT has focused on the experimental aspect more in order to understand the roles played by the previously mentioned parameters on the compressive strength of the paste, mortar and concrete. Many researchers have experimentally synthesised alkali-activated mortars and concrete from natural pozzolan (NP) [9,10,[29][30][31], rice husk ash [12], palm oil fuel ash (POFA) [12][13][14][15][16], silicomanganese slag (SiMn) [17], ground granulated blast furnace slag (GGBFS) [17][18][19]32,33], fly ash (FA) [20], and silica fume (SF) [20,21].…”

Section: Introductionmentioning

confidence: 99%

Empirical Modelling of the Compressive Strength of an Alkaline Activated Natural Pozzolan and Limestone Powder Mortar

Adewumi¹

2020

Ceramics - Silikaty

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An experimental investigation was conducted to synthesise an alkali-activated binder using natural pozzolan and limestone powder. The effect of the mix parameters such as the binder ratio, NaOH molarity (4 -14 M), curing temperature (25 -90 °C), sodium silicate to sodium hydroxide ratio (0.5 -1.5), fine aggregate to binder ratio (1.4 -2.2), alkaline activator to binder ratio (0.45 -0.55) and curing days (1,3,7,14,28) were determined on the compressive strength of the mortar. A stepwise regression algorithm was developed to estimate the compressive strength of the mortar. Five different models (I-V) were developed using 130 experimental data sets with seven descriptors. Bayesian information criterion (BIC), Akaike's information criterion (AIC) and the sum of square error (SSE) criteria were used to fit the developed model in order to select the best model. The cubic with interactions model (V) is characterised with a high correlation coefficient (97.2 %), the lowest root means square error (1.672), and the lowest mean absolute error (1.313) in comparison with the other four models (I-IV). The outcomes of this work could provide an effective and efficient way of modelling the compressive strength of environmentally friendly binders with minimal experimental stress, limit the uncertainties and errors inherent in a laboratory.

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Impact of added water and superplasticizer on early compressive strength of selected mixtures of palm oil fuel ash-based engineered geopolymer composites

Cited by 51 publications

References 27 publications

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

POFA-Engineered Alkali-activated Cementitious Composite Performance in Acid Environment

Experimental and Modelling of Alkali-Activated Mortar Compressive Strength Using Hybrid Support Vector Regression and Genetic Algorithm

Empirical Modelling of the Compressive Strength of an Alkaline Activated Natural Pozzolan and Limestone Powder Mortar

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