Development of the SHRP Superpave Mixture Specification Test Method to Control Thermal Cracking Performance of Pavements

2009 ◽  
pp. 55-55-19
Author(s):  
R Roque ◽  
DH Hiltunen ◽  
WG Buttlar ◽  
T Farwana
Keyword(s):  
Thermal Cracking ◽  
Test Method ◽  
Specification Test ◽  
Cracking Performance

Dumbbell Test Method for Evaluation of the Early Age Cracking Property of Concrete Material by Stress Risers

2012 ◽  
Vol 503-504 ◽  
pp. 473-476
Author(s):  
Yan Liu ◽  
Zhi Gang Luo ◽  
Jie Cao
Keyword(s):  
Test Method ◽  
Early Age ◽  
Construction Site ◽  
Quick Method ◽  
Concrete Material ◽  
Stress Risers ◽  
Test Technology ◽  
Cracking Performance ◽  
Simulated Test ◽  
Job Site

This article develops one new test technology, dumbbell test method, for evaluation of the early age cracking property of Concrete Material under constraint conditions. Its exercise of stress risers could lead concrete to crack quickly, providing a quick method to evaluate the early age crack performance of concrete material and to perform simulated test at job site conveniently. By this method, the anti-cracking performance of different concrete material can be evaluated quickly in the construction site.

Effect of Fly Ash on the early Age Cracking Performance of Cement Paste

2014 ◽  
Vol 584-586 ◽  
pp. 894-898
Author(s):  
Ping Zhang ◽  
Guan Guo Liu ◽  
Chao Ming Pang ◽  
Bing Du ◽  
Hong Gen Qin
Keyword(s):  
Computed Tomography ◽  
Fly Ash ◽  
Cement Paste ◽  
Test Method ◽  
Early Age ◽  
Cement Ratio ◽  
X Ray ◽  
Cracking Performance ◽  
X Ray Computed ◽  
Ct Test

The X ray computed tomography (X-CT) was applied to test the cracking resistance of cement paste, and the hydration process was monitored to study the effect of fly ash on the early age cracking performance. The results showed that the hydration heat reduced with the increase of fly ash under the same water-cement ratio. Within 24h, the porosity increased with time. The addition of fly ash increased the proportion of large holes and then changed the internal stress state. Using X-CT test method and by comparing the number of cracks, the sample with 20% FA was found to have the most serious cracks, whereas the sample with 30% FA had the best crack resistance.

Effect of Mix Design Variables on Thermal Cracking Performance Parameters of Asphalt Mixtures

2018 ◽  
Vol 2672 (28) ◽  
pp. 471-480 ◽  
Author(s):  
Mirkat Oshone ◽  
Debaroti Ghosh ◽  
Eshan V. Dave ◽  
Jo Sias Daniel ◽  
Joseph M. Voels ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Correlation Coefficients ◽  
Thermal Cracking ◽  
Binder Content ◽  
Asphalt Mixtures ◽  
Mix Design ◽  
Design Variables ◽  
Cracking Performance ◽  
Asphalt Content ◽  
Asphalt Film

To address asphalt pavement thermal cracking, researchers have developed performance-based evaluation tools for asphalt mixtures. A minimum fracture energy obtained from a disc-shaped compact tension test and Black space parameters determined by the stiffness and relaxation properties of asphalt mixtures are two such methods to ensure good thermal cracking resistance. Mix specifiers and producers strive to meet the requirements set by these performance-based criteria by adjusting their mix designs. However, there is a lack of information and consensus on the effect of mix design variables (such as binder grade and mix volumetrics) on thermal cracking performance of mixtures as it relates to fracture energy and Black space location. This study strives to fill this gap by quantifying the effect of: (1) recycled asphalt content, (2) effective binder content, (3) air voids, (4) asphalt film thickness, (5) voids in mineral aggregates, and (6) PG low and high temperature grades on thermal cracking resistance. A large dataset, 90 mixtures from the Minnesota Department of Transportation and 81 mixtures from University of New Hampshire database, was used for the study. The results indicate a strong correlation between binder related properties (binder content, asphalt film thickness, PG spread) and fracture energy. The correlation coefficients obtained from this study for PG spread, effective binder content, and air void can be confidently employed to achieve targeted fracture energy thresholds. The same can be achieved for the Glower-Rowe parameter at 15ºC by employing the correlation coefficients obtained for PG low temperature, virgin asphalt content, and voids in the mineral aggregate.

Thermal Cracking Resistance of Shotcrete Based on Temperature Matched Curing

2011 ◽  
Vol 391-392 ◽  
pp. 849-853
Author(s):  
Bo Chen ◽  
Jian Tong Ding ◽  
Yue Bo Cai ◽  
Qiu Bo Kang
Keyword(s):  
Stress Testing ◽  
Testing Machine ◽  
Thermal Cracking ◽  
Test Method ◽  
Test Results ◽  
Cracking Resistance ◽  
Different Types ◽  
Practical Temperature ◽  
The Difference ◽  
Cracking Tendency

In order to evaluate the thermal cracking resistance of shotcrete under the condition of practical temperature field and strong restrain, a proper test method is needed. Based on temperature matched curing and by applying temperature stress testing machine, a new test method has been provided. With the application of this test method, thermal cracking resistance of three shotcretes with different types of fiber were investigated. Test results show that the cracking tendency of different shotcretes can be distinguished with the parameter of the difference between the max temperature and the cracking temperature.

Improvement on the thermal cracking performance of pellets prepared from ultrafine iron ore

2019 ◽  
Vol 342 ◽  
pp. 873-879 ◽  
Author(s):  
Guojing Wong ◽  
Xiaohui Fan ◽  
Min Gan ◽  
Zhiyun Ji ◽  
Xuling Chen ◽  
...  
Keyword(s):  
Iron Ore ◽  
Thermal Cracking ◽  
Cracking Performance
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