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Service life prediction of fly ash concrete using an artificial neural network

Frontiers of Structural and Civil Engineering 2021年第3期15卷 793-805页

作者： Yasmina KELLOUCHE mohamed ghrici Bakhta BOUKHATEM Geomaterials Laboratory Hassiba Benbouali University of ChlefChlefAlgiers02000Algeria Department of Civil Engineering University of SherbrookeSherbrookeJK 2R1Canada

Carbonation is one of the most aggressive phenomena affecting reinforced concrete structures and causing their degradation over *** reinforcement is altered by carbonation,the structure will no longer fulfill service *** this purpose,the present work estimates the lifetime of fly ash concrete by developing a carbonation depth prediction model that uses an artificial neural network technique.A collection of 300 data points was made from experimental results available in the published *** training of a three-layer perceptron was selected for the calculation of weights and biases of the network to reach the desired *** parameters affecting carbonation were used as input neurons:binder content,fly ash substitution rate,water/binder ratio,CO_(2)concentration,relative humidity,and concrete ***,experimental validation carried out for the developed model shows that the artificial neural network has strong potential as a feasible tool to accurately predict the carbonation depth of fly ash ***,a mathematical formula is proposed that can be used to successfully estimate the service life of fly ash concrete.

关键词： concrete fly ash carbonation neural networks experimental validation service life

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Effect of natural pozzolan content on the properties o engineered cementitious composites as repair material

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Frontiers of Structural and Civil Engineering 2018年第3期12卷 261-269页

作者： Said CHOUCHA Amar BENYAHIA mohamed ghrici mohamed Said MANSOUR Geomaterials Laboratory Civil Engineering Department University Hassiba Benbouali of Chlef BP 151 Chief02000 Algeria

In order to determine the effect of Natural Pozzolan （NP） content on the mechanical properties and durability characteristics on Engineered Cementitious Composites （ECC） as repair material. This study focused on the evaluation of the most factors influencing compatibility between the repair material and the base concrete including mechanicals properties such as, compressive and flexural strengths, elastic modulus, capillary absorption and drying shrinkage. The experimental results showed that natural pozzolan reduces the compressive strength and the flexuraI strength of ECC at all ages. The elastic modulus of ECC was remarkably lower than that of normal-strength concrete. This lower ~oung＇s modulus is desirable for repair concrete, because it prevents the stresses induced by restrained shrinkage. In addition, the incorporation of high-volume natural pozzolan decreases significantly the coefficient of capillary absorption at long term and increases the drying shrinkage. Generally, based on the results obtained in the present experimental investigation, ECC can be used effectively as an overlay material over existing parent concrete.

关键词： natural pozzolan engineered cementitious composites mechanical strengths elastic modulus capillary absorption drying shrinkage

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