Effect of Concrete Materials on Permeability of Concrete Mixes Used in Mn/DOT Paving Projects PDF Download
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Author: Ryan J. Rohne Publisher: ISBN: Category : Aggregates (Building materials) Languages : en Pages : 31
Book Description
This report analyzed the mix designs and permeability of 230 concrete mixes from Minnesota paving projects paved between 2004 and 2008. Concrete permeability was measured on cores according to ASTM C 1202, Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration. Previous studies showed that aggregate gradations conforming to the 8-18 gradation specification do not always produce denser graded aggregates or concrete with better properties (higher strength, better finishability, greater freeze-thaw durability) than gradations that do not meet the 8-18 specification. Based on box plots and descriptive statistics, granite produced concrete with lower permeability than limestone and gravel. According to the Student's T-test with a 95% significance level, 7-18 graded aggregate produced concrete with significantly lower permeability than 8-18 graded and cement source and contractor both also affected permeability. According to the Student's T-test with a 90% significance level, 7-18 graded aggregate produced concrete with significantly lower permeability than gap graded mixes.
Author: Ryan J. Rohne Publisher: ISBN: Category : Aggregates (Building materials) Languages : en Pages : 31
Book Description
This report analyzed the mix designs and permeability of 230 concrete mixes from Minnesota paving projects paved between 2004 and 2008. Concrete permeability was measured on cores according to ASTM C 1202, Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration. Previous studies showed that aggregate gradations conforming to the 8-18 gradation specification do not always produce denser graded aggregates or concrete with better properties (higher strength, better finishability, greater freeze-thaw durability) than gradations that do not meet the 8-18 specification. Based on box plots and descriptive statistics, granite produced concrete with lower permeability than limestone and gravel. According to the Student's T-test with a 95% significance level, 7-18 graded aggregate produced concrete with significantly lower permeability than 8-18 graded and cement source and contractor both also affected permeability. According to the Student's T-test with a 90% significance level, 7-18 graded aggregate produced concrete with significantly lower permeability than gap graded mixes.
Author: Lawrence Sutter Publisher: ISBN: Category : Pavements Languages : en Pages : 687
Book Description
This research investigated the impact of MnDOT implementing a w/cm-based specification for concrete pavements. Pavement sections constructed before and after the specification implementation were examined to assess permeability, compressive strength and air-void system parameters. Pavement management system data was examined to identify changes in ride quality associated with the specification change. The results show the change to a w/cm-based specification resulted in concrete with lower permeability, higher strength, and increased air content. The ride quality for those pavements appears to be better and the rate of degradation of ride quality appears to be slower.
Author: Hakan I. Yasarer Publisher: ISBN: Category : Languages : en Pages :
Book Description
Reliable and economical design of Portland Cement Concrete (PCC) pavement structural systems relies on various factors, among which is the proper characterization of the expected permeability response of the concrete mixes. Permeability is a highly important factor which strongly relates the durability of concrete structures and pavement systems to changing environmental conditions. One of the most common environmental attacks which cause the deterioration of concrete structures is the corrosion of reinforcing steel due to chloride penetration. On an annual basis, corrosion-related structural repairs typically cost millions of dollars. This durability problem has gotten widespread interest in recent years due to its incidence rate and the associated high repair costs. For this reason, material characterization is one of the best methods to reduce repair costs. To properly characterize the permeability response of PCC pavement structure, the Kansas Department of Transportation (KDOT) generally runs the Rapid Chloride Permeability test to determine the resistance of concrete to penetration of chloride ions as well as the Boil test to determine the percent voids in hardened concrete. Rapid Chloride test typically measures the number of coulombs passing through a concrete sample over a period of six hours at a concrete age of 7, 28, and 56 days. Boil Test measures the volume of permeable pore space of the concrete sample over a period of five hours at a concrete age of 7, 28, and 56 days. In this research, backpropagation Artificial Neural Network (ANN)-based and Regression-based permeability response prediction models for Rapid Chloride and Boil tests are developed by using the databases provided by KDOT in order to reduce or eliminate the duration of the testing period. Moreover, another set of ANN- and Regression-based permeability prediction models, based on mix-design parameters, are developed using datasets obtained from the literature. The backpropagation ANN learning technique proved to be an efficient methodology to produce a relatively accurate permeability response prediction models. Comparison of the prediction accuracy of the developed ANN models and regression models proved that ANN models have outperformed their counterpart regression-based models. Overall, it can be inferred that the developed ANN-Based permeability prediction models are effective and applicable in characterizing the permeability response of concrete mixes used in transportation applications.
Author: Joshua Edmond Bledsoe Publisher: ISBN: Category : Cement Languages : en Pages : 292
Book Description
The chloride permeability of concrete mixes is an extremely important property for concrete mixes, such as in bridges that are exposed to the elements. The presence of chloride ions at the level of the reinforcing steel initiates corrosion, ultimately leading to the repair or replacement of the bridge. To counteract this effect, engineers have developed concrete designs incorporating supplementary cementitious materials and other admixtures to slow this process. In order to evaluate the effectiveness of these admixtures, two tests are commonly used to determine the permeability of the concrete: the AASHTO Salt Ponding Test and the Rapid Chloride Permeability Test (RCPT). For this project, 10 concrete mix designs used by the NCDOT were mixed and poured in the laboratories at UNC Charlotte. These mixes were then tested using the salt ponding test and RCPT to determine if there is a correlation between the test results. Test results indicate that the permeability of concrete without supplementary cementitious admixtures can be predicted with RCPT results whereas the permeability of mixes containing admixtures cannot. Bulk diffusion and rapid migration tests were also conducted on four of the mix designs and yielded results that merit further investigation by the NCDOT.
Author: National Research Council (U.S.). Highway Research Information Service Publisher: ISBN: Category : Highway engineering Languages : en Pages : 622
Author: Ryan J. Rohne
Author: Ryan J. Rohne
Author: Lawrence Sutter
Author: Asphalt Institute
Author: National Research Council (U.S.). Transportation Research Board
Author: Hakan I. Yasarer
Author: Paul D. Tennis
Author: 
Author: Joshua Edmond Bledsoe
Author: National Research Council (U.S.). Highway Research Information Service
Author: