Field Trials of Rapid-Setting Repair Materials PDF Download
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Author: Prashant Ram
Publisher:
ISBN: 9781622604395
Category :
Languages : en
Pages :
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Book Description
The primary objective of the present study was to identify the critical properties (based on the laboratory tests) that could be correlated to the field performance of the rapid setting repair materials.The first phase of the project involved laboratory evaluation of six commercial rapid-setting repair materials (RMs). When tested in the laboratory, all but two exhibited acceptable rates of strength gain and three displayed relatively poor freeze-thaw resistance. All the RMs exhibited acceptable values for free-shrinkage, high resistance to cracking and good bond to substrate concrete. The resistance to chloride ion penetration of one of the RMs was very poor.The second phase of the project involved field installation and performance evaluation of the RMs. It was seen that while, in most cases, the controlled laboratory conditions yielded consistent mixes and acceptable performance, the properties of mixes produced on site were more variable. This was the result of somewhat uncontrolled changes in the amount of aggregate extension used, moisture content of the aggregates, amount water added and ambient temperature conditions. Follow-up inspection of the repair patches indicated that all the patches except one underwent premature failures (primarily cracking and edge de-bonding). The ambient temperature during the repairs was around 10°C. This led to an extended set-time for all the materials. The 12-hr compressive strengths values of the specimens from the field-mixes were occasionally lower than the 4-hr compressive strength values of laboratory mixes. Since the repairs were open to traffic after approximately 4 hours after placement, the low early age strengths could be a potential reason for premature failures of some of the patches.In general, several materials were found to be very sensitive to excess water added during mixing, resulting in a significant impact on the durability properties - especially the freeze-thaw resistance. In the field, for most of the materials, the consistency of the mixes varied across batches - this can be attributed to the variations in the aggregate extension adopted, mix-water added and the moisture content of the aggregates used. Construction-related issues (consolidation and finishing) also played an important role in the performance of the repair patches.
Author: Prashant Ram
Publisher:
ISBN: 9781622604395
Category :
Languages : en
Pages :
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Book Description
The primary objective of the present study was to identify the critical properties (based on the laboratory tests) that could be correlated to the field performance of the rapid setting repair materials.The first phase of the project involved laboratory evaluation of six commercial rapid-setting repair materials (RMs). When tested in the laboratory, all but two exhibited acceptable rates of strength gain and three displayed relatively poor freeze-thaw resistance. All the RMs exhibited acceptable values for free-shrinkage, high resistance to cracking and good bond to substrate concrete. The resistance to chloride ion penetration of one of the RMs was very poor.The second phase of the project involved field installation and performance evaluation of the RMs. It was seen that while, in most cases, the controlled laboratory conditions yielded consistent mixes and acceptable performance, the properties of mixes produced on site were more variable. This was the result of somewhat uncontrolled changes in the amount of aggregate extension used, moisture content of the aggregates, amount water added and ambient temperature conditions. Follow-up inspection of the repair patches indicated that all the patches except one underwent premature failures (primarily cracking and edge de-bonding). The ambient temperature during the repairs was around 10°C. This led to an extended set-time for all the materials. The 12-hr compressive strengths values of the specimens from the field-mixes were occasionally lower than the 4-hr compressive strength values of laboratory mixes. Since the repairs were open to traffic after approximately 4 hours after placement, the low early age strengths could be a potential reason for premature failures of some of the patches.In general, several materials were found to be very sensitive to excess water added during mixing, resulting in a significant impact on the durability properties - especially the freeze-thaw resistance. In the field, for most of the materials, the consistency of the mixes varied across batches - this can be attributed to the variations in the aggregate extension adopted, mix-water added and the moisture content of the aggregates used. Construction-related issues (consolidation and finishing) also played an important role in the performance of the repair patches.
Author: D. L. O'Connor
Publisher:
ISBN:
Category : Mortar
Languages : en
Pages : 48
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
Author: Mark A. Temple
Publisher:
ISBN:
Category : Fiber-reinforced concrete
Languages : en
Pages : 124
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Book Description
Author: Andreas Loizos
Publisher: CRC Press
ISBN: 1351585789
Category : Technology & Engineering
Languages : en
Pages : 3209
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Book Description
Bearing Capacity of Roads, Railways and Airfields includes the contributions to the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017, 28-30 June 2017, Athens, Greece). The papers cover aspects related to materials, laboratory testing, design, construction, maintenance and management systems of transport infrastructure, and focus on roads, railways and airfields. Additional aspects that concern new materials and characterization, alternative rehabilitation techniques, technological advances as well as pavement and railway track substructure sustainability are included. The contributions discuss new concepts and innovative solutions, and are concentrated but not limited on the following topics: · Unbound aggregate materials and soil properties · Bound materials characteritics, mechanical properties and testing · Effect of traffic loading · In-situ measurements techniques and monitoring · Structural evaluation · Pavement serviceability condition · Rehabilitation and maintenance issues · Geophysical assessment · Stabilization and reinforcement · Performance modeling · Environmental challenges · Life cycle assessment and sustainability Bearing Capacity of Roads, Railways and Airfields is essential reading for academics and professionals involved or interested in transport infrastructure systems, in particular roads, railways and airfields.
Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 100
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Book Description
Author: United States. Federal Highway Administration. Offices of Research and Development
Publisher:
ISBN:
Category :
Languages : en
Pages : 620
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Book Description
Author: Armelle Chabot
Publisher: Springer Nature
ISBN: 3030552365
Category : Technology & Engineering
Languages : en
Pages : 724
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Book Description
This volume gathers the latest advances, innovations, and applications in the field of accelerated pavement testing (APT), presented at the 6th International Conference on Accelerated Pavement Testing, in Nantes, France, in April 2022. Discussing APT, which involves rapid testing of full-scale pavement constructions for structural deterioration, the book covers topics such as APT facilities, APT of asphalt concrete and sustainable/innovative materials, APT for airfield pavements, testing of maintenance and rehabilitation solutions, testing of smart and multi-functional pavements, data analysis and modeling, monitoring and non-destructive testing, and efficient means of calibrating/developing pavement design methods. Featuring peer-reviewed contributions by leading international researchers and engineers, the book is a timely and highly relevant resource for materials scientists and engineers interested in determining the performance of pavement structures during their service life (10+ years) in a few weeks or months.
Author: Kevin G. Smith
Publisher:
ISBN:
Category : Fiber-reinforced concrete
Languages : en
Pages : 216
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Book Description
Author: Kyle Riding
Publisher:
ISBN:
Category : Adhesives
Languages : en
Pages : 0
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Book Description
"The durability of partial depth repair is directly related to the bond strength between the repair material and existing concrete. Bond strength development sensitivity to wait time with the use of bonding agents in partial depth repair was investigated in this study. Cementitious grouts, epoxy, acrylic latex, and ployvinyl acetate were used as bonding agents for portland cement concrete repair material. Portland cement concrete repairs with dry and saturated surface dry conditions, and three rapid repair cementitious materials were used for comparative purposes to investigate the benefits over other alternatives for using bonding agents. Laboratory samples were made by placing repair concrete 0, 2, 5, 10, and 30 minutes after bonding agent application. The bond strength was then measured using a direct shear test. Field tests were performed using the repair materials and bonding agents. When the agents were applied in the field, the wait times between bonding agent application and repair material application were 0, 15, 30, and 45 minutes. Seven-day and 5-month direct tension pull-off tensile tests were performed during the field experiment. The data from both experiments show that when using cement grout bonding agents, after 15 minutes, bond loss can be expected. Wait times did not have a significant effect on epoxy and acrylic latex bonding agents as long as they were placed before setting. The polyninyl acetate agent and repair materials can develop high bond strength in laboratory settings, but when used in the field, the bond strengths experience strength loss with time. The results also showed that adequate bond strength for many repairs can be obtained by placing the repair concrete on a substrate in saturated surface dry condition" (page x).
