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Zeta Potential of Aggregate and Dynamic Modulus of HMA Estimation Using Aggregate Silica Content
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作者 Mouhamed Lamine Chérif Aidara Serigne Touba Thiam Alan Carter 《Open Journal of Civil Engineering》 CAS 2023年第1期35-47,共13页
The mineralogical composition of an aggregate influences its adhesion with bitumen and therefore its dynamic modulus. However, few studies have been conducted on this aspect. One of the most used properties to describ... The mineralogical composition of an aggregate influences its adhesion with bitumen and therefore its dynamic modulus. However, few studies have been conducted on this aspect. One of the most used properties to describe the impact of aggregate on the adhesiveness phenomena is the zeta potential. In this study, the first mineralogical and chemical properties were considered through the percentage of silica in the rock source of aggregates and the electric aggregate particles charge zeta. Dynamic modulus values used for regression process are determined from complex modulus test on nine asphalt concretes mix designed with aggregate types (basalt of Diack, quartzite of Bakel and Limestone of Bandia). The results showed that aggregate with high percentage of silica have higher zeta potential than aggregate with low percentage of silica. The development of a zeta potential predictive model showed a strong sensitivity to silica. The results of the complex modulus tests showed that Hot Mixture Asphalt (HMA) mixed with aggregate containing high silica contents gave better results than those mixed with aggregates containing low percentage of silica. The dynamic modulus predictive models of HMA developed shows that it is the properties of bitumen that influence more. However, the effect of silica although low, is very marked at low temperatures and high frequencies. 展开更多
关键词 Basalt of Diack Quartzite of Bakel limestone of bandia Complex Modulus Test Binder-Aggregate Adhesiveness
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Development of a Dynamic Modulus Prediction Model for Hot Mixture Asphalt and Study of the Impact of Aggregate Type and Its Electrochemical Properties
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作者 Mouhamed Lamine Chérif Aidara Makhaly Ba Alan Carter 《Open Journal of Civil Engineering》 2020年第3期213-225,共13页
The most famous model known in prediction of dynamic modulus for asphalt concretes<span style="font-family:Verdana;"> is</span><span style="font-family:Verdana;"> the Witczak and ... The most famous model known in prediction of dynamic modulus for asphalt concretes<span style="font-family:Verdana;"> is</span><span style="font-family:Verdana;"> the Witczak and Hirsh models. These models didn’t use the mineralogical and chemical properties of aggregates. Witczak models used the passing or refusal percentage to sieve diameters and Hirsh model use</span><span style="font-family:Verdana;">d</span><span style="font-family:""><span style="font-family:Verdana;"> the volumetric analysis. All models developed until now considered that the aggregates were geotechnical conforming to standards. In this study the first mineralogical and chemical properties were considered through the percentage of silica in the rock source of aggregates and the electric aggregate particles charge zeta. Dynamic modulus values used for regression process are determined from complex modulus test on nine asphalt concretes mix designed with aggregate types (basalt of Diack, quartzite of Bakel and Limestone of Bandia).</span><span style="font-family:Verdana;"> Between Twelve initial inputs</span></span><span style="font-family:Verdana;">,</span><span style="font-family:""><span style="font-family:Verdana;"> the statistical regression by exclusion process keeps only seven parameters as input for the model. The mineralogical model showed good accuracy with R</span><sup><span style="font-family:Verdana;">2</span></sup><span style="font-family:Verdana;"> equal to 0.09. The student test on the model parameters showed that all the parameters included in the model were meaningful with good p inferior to 0.05. The Fisher test on the model showed the same result. The analysis of the sensitivity of the mineralogical model to zet</span></span><span style="font-family:Verdana;">a potential showed that the dynamic modulus increase</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> <span style="font-family:Verdana;">with the positive zeta-potentials and decrease</span></span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> with the negative zeta-potentials.</span><span style="font-family:Verdana;"> The analysis of the sensitivity of the mineralogical model to the silica showed that the dynamic modulus decreases with the increase of the silica.</span> 展开更多
关键词 Dynamic Modulus MINERALOGICAL Basalt of Diack Quartzite of Bakel limestone of bandia Zeta Potential Silica
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