Triaxial frequency sweep characterization of Saskatchewan hot mix asphaltic concrete across asphalt cement binder type

2009 ◽  
Vol 36 (9) ◽  
pp. 1403-1410 ◽  
Author(s):  
Curtis Berthelot ◽  
Diana Podborochynski ◽  
Colin Wandzura ◽  
Colin Prang ◽  
Brent Marjerison
Keyword(s):  
Stress State ◽  
Mechanical Behaviour ◽  
Asphalt Concrete ◽  
Hot Mix Asphalt ◽  
Frequency Sweep ◽  
Asphalt Cement ◽  
Load Rate ◽  
Binder Type ◽  
Cement Binder

The purpose of this research was to determine how asphalt cement binder types influence the mechanical behaviour of hot mix asphalt concrete mixes. This research employed triaxial frequency sweep characterization of a typical City of Saskatoon Hot Mix Type A2 and a typical Saskatchewan Ministry of Highways and Infrastructure Hot Mix Type 70 across a range of triaxial load frequencies and stress states representative of Saskatchewan field state conditions. The asphaltic mixes were evaluated across four asphalt cement binder types typically employed by Saskatchewan road agencies. Based on the findings of this study, the mechanical behaviour of both asphalt mixes evaluated were found to be highly sensitive to load rate, stress state, as well as asphaltic binder type. It was concluded that load rate, field stress state, and asphalt binder type should be incorporated into the structural design of hot mix asphalt concrete pavements to ensure adequate mix performance, particularly when placed in severe field conditions.

Effects of asphalt concrete characteristics on cohesive zone model parameters of hot mix asphalt mixtures

2016 ◽  
Vol 43 (3) ◽  
pp. 226-232 ◽  
Author(s):  
S. Pirmohammad ◽  
H. Khoramishad ◽  
M.R. Ayatollahi
Keyword(s):  
Asphalt Concrete ◽  
Cohesive Energy ◽  
Cohesive Zone ◽  
Hot Mix Asphalt ◽  
Cohesive Zone Model ◽  
Experimental Tests ◽  
Model Parameters ◽  
Zone Model ◽  
Binder Type ◽  
Air Void

In this paper, the effects of the main asphalt concrete characteristics including the binder type and the air void percentage on the cohesive zone model (CZM) parameters were studied. Experimental tests were conducted on semi-circular bend (SCB) specimens made of asphalt concrete and the fracture behavior was simulated using a proper CZM. The CZM parameters of various hot mix asphalt (HMA) mixtures were determined using the SCB experimental results. Five types of HMA mixtures were tested and modeled to consider the effects of binder type and air void percentage on the CZM parameters. The results showed that as the binder in HMA mixture softened, the cohesive energy strength increased, whereas enhancing the air void percentage led to reduction of the cohesive energy and strength values. Among the studied HMA mixtures, the highest values of CZM parameters were found for the HMA mixture containing a copolymer called styrene-butadiene-styrene.

Comparison of mechanistic laboratory characterization and 10-year rutting performance of SPS-9A test site in Saskatchewan

2010 ◽  
Vol 37 (3) ◽  
pp. 489-495
Author(s):  
Curtis Berthelot ◽  
Diana Podborochynski ◽  
Ania Anthony ◽  
Brent Marjerison
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Test Site ◽  
Performance Comparison ◽  
Test Results ◽  
Frequency Sweep ◽  
Asphalt Mixes ◽  
Asphalt Cement ◽  
Laboratory Characterization ◽  
Frequency Sweep Test

This paper provides a performance comparison of mechanistic laboratory and field rutting performance of four asphalt concrete mixes constructed in 1996 at a Strategic Highway Research Program SPS-9A test site located in Saskatchewan. The asphalt mixes included two Saskatchewan Type 70 Marshall mixes and two coarse graded Superpave™ mixes and employed 150–200A and 200–300A penetration grade asphalt cement binders. The triaxial frequency sweep characterization determined that the Superpave™ mix yielded improved mechanistic structural constitutive properties when compared to the Saskatchewan Type 70 mix. In addition, improved mechanistic structural properties were observed with the mixes employing 150–200A (PG 58-28) asphalt binder relative to the 200–300A (PG 52-34) asphalt binder, particularly the Saskatchewan Type 70 mix. The 10-year rutting performance of the Radisson SPS-9A test site was evaluated and the field rutting results concurred with the triaxial frequency sweep test results. The triaxial frequency sweep characterization employed in this study appears to adequately rank asphalt mixes with respect to field rutting performance.

scholarly journals Moisture Susceptibility of Asphalt Concrete Pavement Modified by Nanoclay Additive

2019 ◽  
Vol 5 (12) ◽  
pp. 2535-2553 ◽  
Author(s):  
Saif Al-din Majid Ismael ◽  
Mohammed Qadir Ismael
Keyword(s):  
Asphalt Concrete ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Moisture Damage ◽  
Strength Ratio ◽  
Moisture Susceptibility ◽  
Asphalt Cement ◽  
Asphalt Content ◽  
Marshall Stability ◽  
Asphalt Concrete Pavement

Durability of hot mix asphalt (HMA) against moisture damage is mostly related to asphalt-aggregate adhesion. The objective of this work is to find the effect of nanoclay with montmorillonite (MMT) on Marshall properties and moisture susceptibility of asphalt mixture. Two types of asphalt cement, AC(40-50) and AC(60-70) were modified with 2%, 4% and 6% of Iraqi nanoclay with montmorillonite. The Marshall properties, Tensile strength ratio(TSR) and Index of retained strength(ISR) were determined in this work. The total number of specimens was 216 and the optimum asphalt content was 4.91% and 5% for asphalt cement (40-50) and (60-70) respectively. The results showed that the modification of asphalt cement with MMT led to increase Marshall stability and the addition of 6% of MMT recorded the highest increase, where it increased by 26.35% and 22.26% foe asphalt cement(40-5) and(60-70) respectively. Also, the addition of MMT led to increase moisture resistance of asphalt mixture according to the increase in TSR and IRS. The addition of 4% and 6% of MMT recorded the highest increase in TSR and IRS for asphalt cement (40-50) and (60-70) respectively, where they increased by 11.8% and 17.5% respectively for asphalt cement (40-50) and by 10% and 18% respectively for asphalt cement (60-70).

scholarly journals APLICAÇÃO DO RESÍDUO DA MINERAÇÃO DO COBRE PARA MELHORIA DO DESEMPENHO DE MISTURAS ASFÁLTICAS

2017 ◽  
Vol 14 (1) ◽  
Author(s):  
Ricardo Bentes Kato
Keyword(s):  
Asphalt Concrete ◽  
Road Network ◽  
Cement Content ◽  
Asphalt Mixtures ◽  
Asphalt Cement ◽  
Considerable Portion ◽  
Granulometric Characteristics ◽  
The Cost ◽  
Potential Use

RESUMO: O presente artigo tem o objetivo de verificar o desempenho de misturas asfálticas frente as propriedades Marshall, quando adicionado resíduo da mineração do cobre em sua composição. Justifica-se este trabalho pela crescente geração de resíduos proveniente da atividade mineração, juntamente com deficiencia da malha rodoviária brasileira. Após caracterização dos materiais e dosagem pelo método Marshall, gradativamente substitui-se a areia do concreto betuminoso usinado à quente pelo rejeito de cobre, onde notou-se uma significativa redução do teor de cimento asfáltico, fato este devido às características granulométricas do rejeito que possibilitou maior fechamento dos vazios na massa. Estes resultados apontam para um potencial uso deste resíduo, com contribuições de ordem ambiental, econômica (pois o CAP responde por considerável parcela do custo do concreto asfáltico) e tecnológicas, pela melhoria dos parâmetros Marshall.ABSTRACT: The aim of this paper is to verify the performance of asphalt mixtures against Marshall properties when copper mining residue is added in its composition. This work is justified by the growing generation of waste from the mining activity, together with deficiency of the Brazilian road network. After characterization of the materials and dosage by the Marshall method, the sand of bituminous concrete machined by copper refuse was gradually replaced, where a significant reduction of asphalt cement content was observed, due to the granulometric characteristics of the tailings Greater closure of voids in mass. These results point to a potential use of this residue, with contributions of environmental, economic (because the CAP accounts for a considerable portion of the cost of asphalt concrete) and technological, by the improvement of Marshall parameters.

Stress state characterization of ductile materials during scratch abrasion

Wear ◽  
2021 ◽  
pp. 203712
Author(s):  
Dhanraj Rajaraman ◽  
V. Keim ◽  
K. Pondicherry ◽  
A. Nonn ◽  
S. Hertelé ◽  
...  
Keyword(s):  
Stress State ◽  
Ductile Materials
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