Test Development and Material Characterization of Hot Poured Crack Sealant at Low Temperature

Test Development and Material Characterization of Hot Poured Crack Sealant at Low Temperature
Author: Shih-Hsien Yang
Publisher: ProQuest
Total Pages: 205
Release: 2009
Genre:
ISBN: 9781109219388

Among these six performance parameters, stiffness at 240s of 25MPa, average creep rate of 0.31 mm/mm/s, and extendibility level at different temperatures were identified and proposed as selection criteria for crack sealant at low temperature. These parameters were used to assess several in-service crack sealants with known field performance. The results show that the proposed tests and performance parameters are highly correlated with sealant field performance when compared to current ASTM specification standards.

Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling

Efficient Transportation and Pavement Systems: Characterization, Mechanisms, Simulation, and Modeling
Author: Imad L. Al-Qadi
Publisher: CRC Press
Total Pages: 924
Release: 2008-11-01
Genre: Technology & Engineering
ISBN: 0203881206

Internationally, significant attention is given to transport sustainability including planning, design, construction, evaluation, safety and durability of the road system. The 4th International Gulf Conference on Roads: Efficient Transportation and Pavement Systems - Characterization, Mechanisms, Simulation, and Modeling, hosted by the University o

Cohesive Property Evaluation of Crack Sealants Using a Low-Temperature Tensile Tester

Cohesive Property Evaluation of Crack Sealants Using a Low-Temperature Tensile Tester
Author: Hengxiao Xue
Publisher:
Total Pages: 12
Release: 2018
Genre: Concrete
ISBN:

This paper presents a new test method that was developed to evaluate the cohesive properties of crack sealants at low temperatures. The low-temperature tensile tester (LTTT) used in this test method was self-developed as a result of field-investigation experiences. Field investigations of crack expansion were conducted in four climate regions in Heilongjiang Province, China, to understand the actual working environment. The LTTT, highly efficient and equipped with a wide measurement range, was then developed. The cohesive specimen is dog-bone shaped and 24 x 24mm in width and thickness, a size selected based on the test results of various specimen dimensions. The optimal elongation rate was 100mm/h, and displacement-at-failure emerged as the evaluation index, having been derived from the analysis of test results at various temperatures and elongation rates. According to the results of field investigation, the threshold values of displacement-at-failure were 84, 60, 36, and 28.8mm, from the lowest to the highest temperature region. The cohesive properties of six types of sealant were assessed on the threshold-evaluation values of the various regions. This test method can effectively differentiate the cohesive properties of various sealants and can be applied in a diversity of climate regions.

Development of a Crack Sealant Adhesion Test (CSADT) Specification for Hot-Poured Bituminous Sealants

Development of a Crack Sealant Adhesion Test (CSADT) Specification for Hot-Poured Bituminous Sealants
Author: Imad L. Al-Qadi
Publisher:
Total Pages: 7
Release: 2011
Genre: Adhesion
ISBN:

Current crack sealant specifications utilize a simple empirical bond test [ASTM D5329, "Standard Test Methods for Sealants and Fillers, Hot-Applied, for Joints and Cracks in Asphaltic and Portland Cement Concrete Pavements"] to measure a sealant's ability to adhere to concrete briquettes. However, no correlation exists between the results of this standard test and a sealant's field performance. To bridge the gap between sealants' fundamental properties and field performance, performance-based guidelines for the selection of hot-poured crack sealants have been developed. This paper proposes a new test procedure to help assess the capability of sealants to adhere to the sides of cracks in pavement. The proposed crack sealant adhesion direct tensile (CSADT) test procedure calls for the use of a direct tensile tester with modifications to the end pieces and the specimen holder. Sealant is confined between two aluminum pieces, which will move apart at 0.05 mm/s until failure occurs. Failure load and the displacement at failure are recorded and then used to assess the sealant's adhesion capability. A crack created on one side of the assembly during specimen preparation determines the initial failure location and ensures that the failure occurs at the interface and not within the sealant. The specimen preparation is designed to simulate sealant installation, and experimental conditions have been developed to represent crack openings during pavement contraction in cold weather. The repeatability of the suggested procedure was acceptable with an average coefficient of variation of 10.9 %. No significant difference existed between two operators or between two test setups.

Development of a Viscosity Specification for Hot-Poured Bituminous Sealants

Development of a Viscosity Specification for Hot-Poured Bituminous Sealants
Author: Imad L. Al-Qadi
Publisher:
Total Pages: 9
Release: 2007
Genre: Crack sealant
ISBN:

Current crack sealant specifications focus on using simple empirical tests such as penetration, resilience, flow, and bonding to cement concrete briquettes (ASTM D 6690) [1] to measure the ability of the material to resist cohesive and adhesive failures. There is, however, no indication of the pertinence of these standard tests to predict the success of field installation and sealant performance. In an effort to bridge the gap between sealant fundamental properties and field performance, performance-based guidelines for the selection of hot-poured crack sealants are currently being developed. This paper proposes a new viscosity test procedure to help assess the propensity of sealants to wet the crack surface during installation. The proposed procedure calls for the use of a Brookfield rotational viscometer equipped with a modified spindle rod and an SC4-27 spindle at a speed of 60 r/min. Sealants are heated 20 min at the recommended installation temperature and the viscosity is measured after 30 s of spindle rotation in the hot sealant. These experimental conditions provide viscosities representative of sealant viscosity at shear rates during field application. The repeatability for within laboratory and between laboratories was found to be 5.4 and 17 %, respectively. This repeatability is comparable with the corresponding variability of the SuperPave viscosity test for asphalt binders.