1. UKM Learning and Research Repository
2. PHD Thesis / Tesis PHD
3. Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Title:	Investigation of engineering characteristics on cement-treated road base using bitumen emulsion, Rovene® 4045 and Tylac® 4190 additives
Authors:	Mojtaba Shojaei Baghini (P55900)
Supervisor:	Amiruddin Ismail, Prof. Dr.
Keywords:	Engineering characteristics Bitumen Road base Roads -- Base courses
Issue Date:	22-Jan-2016
Description:	Enhanced traffic loads, costs of construction and negative effects of moisture damage have motivated pavement engineers to develop more cost-effective technologies to increase pavement bearing capacity and improve short-term and long-term pavement performances. This research aimed to investigate the effects of the engineering characteristics of cement-treated road base with traditional and non-traditional cementitious additives. The effects of type and amount of Portland cement, bitumen emulsion, carboxylate styrene-butadiene emulsion (Rovene® 4045) and styrene-butadiene copolymer latex (Tylac® 4190) were investigated on the performance of road base layer properties using laboratory mechanistic evaluation of stabilised soil-aggregate mixtures. To evaluate the short-term performance, the specimens were stabilised with Portland cement (0-6%), bitumen emulsion (0-6%), Rovene® 4045 (5-10%) and Tylac® 4190 (5-10%) by dry weight of aggregates. Then, the specimens were moulded, cured for 7, 28, and 60 days, and subjected to different stress sequences to study the unconfined compressive strength (UCS), indirect tensile strength (ITS), indirect tensile resilient modulus (ITRM), flexural strength and California Bearing Ratio (CBR). The findings revealed that the additives significantly improved the strength of the mixture which has been found to be an important quality indicator of mechanical properties. The long-term performance of stabilised soil-aggregate specimens was investigated by conducting wetting and drying (WD) cycles, dynamic creep and wheel tracking (WT) tests. The results of the resistance to the WD cycles (durability) test show that the addition of 4% Portland cement-3% bitumen emulsion, 4% Portland cement-7% Rovene® 4045 and 4% Portland cement-8% Tylac® 4190 resulted in reductions of 179.4%, 410.6% and 768.6% in water absorption and permeability; 256.3%, 498.18%, and 773.3% in volume changes, and 211.95%, 1012% and 1395.8% reduction in weight losses compared to samples with only 4% cement after 12 repeated WD cycles respectively. In addition, the results of the creep and WT tests show that the addition of above-mentioned additives contents resulted in reductions of 49.53%, 69.99% and 80.33% in permanent deformation for creep and 38%, 105% and 133.6% for WT at 25oC, and 37.55%, 64.99% and 80.31% for creep and 37.8%, 123% and 309.5% for WT at 50oC respectively. Finally, the study developed models comprising the exponential model, the log-scale model and the American Concrete Institute (ACI) model for short-term performance and three-stage permanent deformation model for long-term performance. These models are essential to assist engineers in selecting, recognizing and assessing the best base materials with good permeability resistance and stability characteristics.,Certification of Master's/Doctoral Thesis" is not available
Pages:	206
Call Number:	TA434.B334 2016 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.