Experimental Investigation of PCC Incorporating RAP

被引:40
作者
Ben Said, Sawssen El Euch [1 ]
Khay, Saloua El Euch [2 ]
Loulizi, Amara [2 ]
机构
[1] Higher Inst Technol Studies Rades, Lab Mat Optimizat & Environm Sustainabil LR11ES16, BP 37, Tunis 1002, Tunisia
[2] Tunis El Manar Univ, Natl Engn Sch Tunis, Lab Mat Optimizat & Environm Sustainabil LR11ES16, BP 37, Tunis 1002, Tunisia
关键词
portland cement; recycled asphalt pavement; heat of hydration; semi-adiabatic; shrinkage; rigid pavements; sustainability; SELF-CONSOLIDATING CONCRETE; MECHANICAL-PROPERTIES; SAND CONCRETE; AGGREGATE; PAVEMENT;
D O I
10.1186/s40069-018-0227-x
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Rehabilitation and repair of flexible pavements produce huge amounts of reclaimed asphalt pavement (RAP) material. Using RAP in the formulation of portland cement concrete (PCC) is a technique that is part of a sustainable development approach since it reduces on the consumption of new aggregates and reuses a material that is considered as waste. This paper describes the semi-adiabatic calorimetry test performed on a concrete mix incorporating RAP material as aggregate. Results showed that the cement hydration process is not affected by the presence of asphalt coated on the surface of RAP material. Classical tests (compressive strength, flexural and indirect-tensile strengths, elastic modulus, and free-shrinkage) were also performed on PCC mixes incorporating different percentages of RAP. It was found that as the percentage of RAP increases, the PCC mechanical properties decrease. This is mainly attributed to the presence of voids in the transition zone between the asphalt-coated aggregates and the hydrated cement paste as confirmed by scanning-electron microscope images. Unrestrained shrinkage testing showed statistically insignificant change in shrinkage strain with RAP content. The strength and shrinkage results lead to conclude that as much as 40% of RAP could be incorporated into the formulation of PCC and achieve properties that are acceptable for the construction of rigid pavements.
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页数:11
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