EFFECT OF RAP CONTENT ON FLEXURAL BEHAVIOR AND FRACTURE TOUGHNESS OF FLEXIBLE PAVEMENT

Abstract

THE USE OF RECYCLED RECLAIMED ASPHALT PAVEMENT (RAP) MATERIAL INTO FLEXIBLE PAVEMENT CONTRIBUTES TO SUSTAINABLE DEVELOPMENT WITH ENVIRONMENTAL AND ECONOMIC BENEFITS. IN THE PRESENT WORK, SEMI-CIRCULAR BENDING (SCB) SPECIMEN HAS BEEN ADOPTED TO STUDY THE FLEXURAL STRENGTH AND MODE-I FRACTURE TOUGHNESS OF FLEXIBLE PAVEMENT WITH AND WITHOUT RAP. TWO DIFFERENT RESOURCES OF RAP, NAMELY KS AND KF, WITH TWO DIFFERENT PERCENTAGES (20% AND 40%) HAVE BEEN EXAMINED. SMOOTH AND CRACKED SPECIMENS HAVE BEEN CAST TO MEASURE THE FLEXURAL STRENGTH AND MODE-I FRACTURE OF FLEXIBLE PAVEMENT CONTAINING RAP, RESPECTIVELY. SMOOTH AND CRACKED SPECIMENS FOR FLEXIBLE PAVEMENT WITHOUT RAP, AS CONTROL BEAMS, HAVE BEEN CAST FOR THE SAKE OF COMPARISONS.

THE EXPERIMENTAL RESULTS SHOWED THAT, THE FLEXURAL STRENGTH AND MODE-I FRACTURE TOUGHNESS OF FLEXIBLE PAVEMENT CONTAINING 40% RAP ARE HIGHER THAN THOSE OF FLEXIBLE PAVEMENT WITHOUT RAP, FOR THE TWO TYPES OF RAP. COMPARISON BETWEEN THE OF WORK OF FRACTURE CALCULATED BASED ON AASHTO TP 105-13 AND AASHTO TP 124-16 SHOWED THAT, THE CALCULATION BASED ON AASHTO TP 105-13 IS MORE ACCURATE THAN THAT BASED ON AASHTO TP 124-16. FURTHERMORE, THE SUGGESTED QUAD-LINEAR RELATION TO WORK OF FRACTURE PREDICTIONS IS EASIER AND MORE REASONABLE FOR PRESENTING THE EXPERIMENTAL RESULTS ESPECIALLY FOR THE DESCENDING PART OF P-LLD CURVE THAN THAT SUGGESTED AS EXPONENTIAL CURVE BY AASHTO TP 124-16. FOR ALL GROUPS, THE TYPE OF FAILURE IS INTERGRANULAR-MODE FRACTURE.

Author Biography

HOSSAM EL-DIN SALLAM, Faculty of Engineering, Zagazig University, Zagazig, Egypt

Professor Hossam El-Din M. Sallam Completed his B.Sc in Civil Engineering at Zagazig University in 1985 and received his M.Sc. and Ph.D. degrees in Materials Engineering from Zagazig University. He was a visiting Ass. Prof. for two years in Northeastern University, Boston, USA.

He has served as a Teaching Assistant, Assistant Professor, Associate Professor and full professor in 2004 at Zagazig University. Recently he appointed as Professor at the department of Civil Engineering, Jazan University, KSA.

Since 1990 his research has focused on several issues including fatigue, fracture mechanics, failure analysis, repair and strengthening of structures, advanced composite materials, nanocomposites, and special concretes. He taught several under- and post-graduate courses in Civil and Mechanical engineering at several Universities.
Prof. Sallam supervised a number of graduate students at Civil and Mechanical Engineering in addition to Dentist Materials (more than 30 theses and greater than 100 scientific papers).

Prof. Sallam is a reviewer in several Societies and Publishers such as ACI, RILEM, ICE, KACST, Techno-Press, EJSE, ScienceDirect, Academic Journals, Science Alert.

Prof. Sallam is a member in the following Committees:
Committee No. 50 for Structural & Construction Engineering, Egyptian Universities Promotion Committees (EUPC), Supreme Council of Universities (SCU).
The Examination Committee of the submitted Scientific Production for the State Incentive Awards in Engineering Sciences 2008, General Administration of Awards & Incentives, Academy of Scientific Research & Technology, Egypt.

Published
2019-03-07
Section
Articles