Paper Information

Journal:   JOURNAL OF TRANSPORTATION INFRASTRUCTURE ENGINEERING (JTIE)   SPRING 2017 , Volume 3 , Number 1 (9) #L0076; Page(s) 53 To 68.
 
Paper: 

DETERMINATION OF PROPER MIX DESIGN FOR CEMENT-TREATED BASE CONTAINING HIGH VOLUME OF RECLAIMED ASPHALT PAVEMENT

 
 
Author(s):  ADRESI MOSTAFA*, HASSANI ABOLFAZL, KHISHDARI ABOLFAZL, ZEINI MARYAM
 
* FACULTY OF CIVIL AND ENVIRONMENTAL ENGINEERING, TARBIAT MODARES UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

In recent decades, using recycled asphalt materials in pavements is considered by researchers due to their economical costs. The purpose of this laboratory experiment is to introduce optimum mix design including suitable grading limits of the mixture, moisture formula for estimation of the amount of water needed for compaction and finally investigating the effect of reclaimed asphalt pavement (RAP) on unconfined compressive strength (UCS) of different cement-treated base mixtures and determination of optimum RAP content and cement with lowest construction cost. For this purpose, first, grading properties of different materials and RAP were determined and proper grading was selected. For studying the compaction characteristics and determining optimum moisture content, 12 different mixture designs, as a combination of 4 RAP percentage (0, 40, 60 and 80) and 3 cement content (3, 5 and 7 percent) were constructed. Then, 15×30 cm cylindrical samples were constructed to investigate UCS properties at optimum moisture content. Results showed that grading limits in Iran's Road Bulletin No.101 could be the main reference for cement treated base (CTB) mixtures containing RAP materials. Also, modeling results of optimum moisture content indicated that by adding more recycled asphalt materials to the mixture would increase optimum moisture content and reduce maximum dry density. The UCS tests undertaken on 7-day cured samples at 25 0C indicated that by increasing the RAP materials to the treated mixture would decrease UCS of the samples. The pavement containing 68% of reclaimed asphalt and treated with 5% cement was the most economical mixture considering the 3.8 Mpa limit of UCS index. Finally, it could be expected that instead of compacting the samples with standard hammer, 60 seconds of vibration compression may be used.

 
Keyword(s): RAP, GRADING, OPTIMUM MOISTURE, UNCONFINED COMPRESSIVE STRENGTH, SEISMIC VIBRATION
 
References: 
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