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Material Selection for Spray Injection Patching Method

Subedi, Bijay
http://rave.ohiolink.edu/etdc/view?acc_num=akron1449231554

Abstract Details

2015, Master of Science, University of Akron, Civil Engineering.
Literature review of several research projects have widely endorsed Spray Injection Patching method as a cost effective and durable pothole repair technique. While these studies provide detailed information related to different states, few researches have been made in Ohio to find out best material combinations to address compatibility issues of different aggregates with asphalt emulsions and best procedure to a long lasting spray injection patch. This study focusses on laboratory testing (compatibility, demulsibility and sensitivity analysis) accompanied with installation of pothole patches from spray injection patching method and its monthly evaluation. Laboratory test for compatibility evaluation was done as described in section 16 of AASHTO T 59-09 with some modifications in which fifteen different aggregates were mixed with seven different asphalt emulsions and in the demulsibility evaluation, the same aggregates were mixed with an asphalt emulsion of six different demulsibility values. For sensitivity test, aggregates stored at room, low and freezing temperature with varying moisture and dust contents were mixed with one asphalt emulsion according to section 16 of AASHTO T 59-09. During these tests, percentage coatings of the mixture, time to start turn black, balling etc. were noted. After laboratory tests, 8 different test sites were chosen with natural cracks and potholes to be durapatched with three aggregates and five asphalt emulsion. Unlike several other studies, no artificial potholes were created for this project. Each site was divided into 40 feet sections and size and dimension of potholes before durapatching were noted. Each section of each site was given a rating based on its condition in the months following installation. These findings were analyzed to find the durability of the spray injection patches with respect to material combinations and climatic conditions. It was observed that cationic emulsion worked better with gravels and anionic emulsions worked better with limestones and dolostones. Also, asphalt emulsion with lower demulsibility values coated better and took more time to break than with higher demulsibility values. It was also observed that higher amount of dust (>3%) in aggregate resulted in significant lower coating and faster curing of asphalt emulsion. The dust in aggregate was found have caused more detrimental effects than moisture in terms of aggregate coating. It was even seen that presence of some moisture in aggregate caused better aggregate coating. From the laboratory experiments, it was also known that with lower temperature, aggregate coating got lower. From field installation it was seen that the potholes patched in relatively warmer temperatures remained intact throughout the evaluation period but the patches installed during below freezing temperatures were subjected to severe damage. Spray injection patches with asphalt emulsion of lower demulsibility values as well as sites where the operator reportedly used more asphalt emulsion in the patch showed more bleeding. Deeper potholes also showed more dishing than shallow potholes.
Ala R. Abbas (Advisor)
161 p.
Civil Engineering
Spray Injection Patching, Spay Injection, Pothole patching method, Pothole repair, Asphalt emulsion, Asphalt emulsion-aggregate mixture, Material selection for pothole repair, aggregates, P200

Recommended Citations

Citations

  • Subedi, B. (2015). Material Selection for Spray Injection Patching Method [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1449231554

    APA Style (7th edition)

  • Subedi, Bijay. Material Selection for Spray Injection Patching Method. 2015. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1449231554.

    MLA Style (8th edition)

  • Subedi, Bijay. "Material Selection for Spray Injection Patching Method." Master's thesis, University of Akron, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1449231554

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.
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