Download or read book Evaluation of Portland Cement Concrete Coefficient of Thermal Expansion Test Protocol and the Impact of CTE on Performance of Jointed Concrete Pavements written by Shervin Jahangirnejad and published by . This book was released on 2009 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Construction Materials and Structures written by S.O. Ekolu and published by IOS Press. This book was released on 2014-12-05 with total page 1562 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two volumes of these Proceedings contain about 200 conference papers and 10 keynote papers presented at the First International Conference on Construction Materials and Structures, held in Johannesburg, South Africa from 24 to 26 November 2014. It includes sections on Materials and characterization; Durability of construction materials; Structural implications, performance, service life; Sustainability, waste utilization, the environment; and Building science and construction.
Download or read book Quantifying Coefficient of Thermal Expansion Values of Typical Hydraulic Cement Concrete Paving Mixtures written by Neeraj J. Buch and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory investigation was conducted to determine the coefficient of thermal expansion (CTE) of a typical Michigan Department of Transportation (MDOT) concrete paving mixture made with coarse aggregate from eight different sources. The primary aggregate class included limestone, dolomite, slag, gravel and trap rock. The CTE was determined using the provisional AASHTO TP60 protocol. Three replicate test specimens were fabricated for each mixture-age combination. Furthermore, the report also discusses the practical (significance) impact of the test variables on the transverse cracking performance of jointed plain concrete pavements.
Download or read book Effect of Portland Cement Concrete Characteristics and Constituents on Thermal Expansion written by Md Sarwar Siddiqui and published by . This book was released on 2014 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The coefficient of thermal expansion (CTE) is one of the major factors responsible for distresses in concrete pavements and structures. Continuously reinforced concrete pavements (CRCPs) in particular are highly susceptible to distresses caused by high CTE in concrete. CRCP is a popular choice across the U.S. and around the world for its long service life and minimal maintenance requirements. CRCP has been built in more than 35 states in the U.S., including Texas. In order to prevent CRCP distresses, the Texas Department of Transportation (TxDOT) has limited the CTE of CRCP concrete to a maximum of 5.5 x10-6 strain/oF (9.9 x10-6 strain/oC). Coarse aggregate sources that produce concrete with CTE higher than the allowable limit are no longer accepted in the TxDOT CRCP projects. Moreover, CTE is an important input in the Mechanistic-Empirical Pavement Design Guide (MEPDG). Small deviations in input CTE can affect the pavement thickness significantly in MEPDG designs. Therefore, accurate determination of concrete CTE is important, as it allows for enhanced concrete structure and pavement design as well as accurate screening of CRCP coarse aggregates. Moreover, optimizing the CTE of concrete according to a structure's needs can reduce that structure's cracking potential. This will result in significant savings in repair and rehabilitation costs and will improve the durability and longevity of concrete structures. This study found that the CTEs determined from saturated concrete samples were affected by the internal water pressure. As a result, the TxDOT method yielded higher values than did the American Association of State Highway and Transportation Officials (AASHTO) method. To further investigate the effect of internal water pressure, an analytical model was developed based on the poroelastic phenomenon of concrete. According to the model, porosity, permeability, and the rate of temperature change are the major factors that influence the internal water pressure development. Increasing the permeability of concrete can reduce the internal water pressure development and can thus improve the consistency of measured CTE values. Preconditioning concrete samples by subjecting them to several heating and cooling cycles prior to CTE testing and reducing the rate of temperature change improved the consistency of the CTE test results. Concrete CTE can be reduced by blending low-CTE aggregates with high-CTE aggregates and reducing the cement paste volume. Based on these findings, a concrete CTE optimization technique was developed that provides guidelines for the selection of concrete constituents to achieve target concrete CTE. A concrete proportioning technique was also developed to meet the need for CTE optimization. This concrete proportioning technique can use aggregate from any sources, irrespective of gradation, shape, and texture. The proposed technique has the potential to reduce the cement requirement without sacrificing performance and provides guidelines for multiple coarse and fine aggregate blends.
Download or read book Summary Report on the Evaluation of Rigid Pavement Long life Strategies written by David Jones (Engineer) and published by . This book was released on 2007 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coefficient of Thermal Expansion of Portland Cement Concrete in Utah and Pavement Performance written by Michael Thomas Rigby and published by . This book was released on 2010 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanistic empirical Pavement Design Guide written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Concrete Age on Coefficient of Thermal Expansion of Paving Mixes and Its Significance in Unbonded Overlay Design written by Gauhar Sabih and published by . This book was released on 2020 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the advancement in rigid pavement design and advent of AASHTOWare Pavement Mechanistic-Empirical (ME) Design (American Association of State Highway and Transportation Officials, Washington, DC) as the latest design tool, increasing emphasis is being laid on the coefficient of thermal expansion (CTE) of concrete. The CTE affects the performance of rigid pavements in a significant manner, with a higher CTE corresponding to greater curling and resulting in greater pavement distresses. Prior research has conflicting views regarding CTE variation with age, and there has been very little to no research on the effects of CTE on the performance of unbonded concrete overlays (UBCOs). This study is performed to investigate the variation of CTE with concrete age through laboratory testing and further quantify the effects of CTE variation on UBCO design. To facilitate, four concrete paving mixes with different types of coarse aggregates and different mix properties from different districts of New Mexico were collected. The cast specimens from each of the mixes were tested for CTE as per the AASHTO T-336, Coefficient of Thermal Expansion of Hydraulic Cement Concrete , protocol, at the ages of 7, 14, 28, 60, 90, 120, and 180 days, respectively. The test results were analyzed, and it was observed that there is an increase in CTE over the range of 3.49 % to 9.77 %, between 28 days and 180 days. Further analysis was conducted with simulations in Pavement ME Design Version 2.3 ® that indicated a significantly deteriorated performance of the UBCO with increased CTE. The impact on transverse cracking and joint faulting is the most significant, with up to 13.3 % increase in cracking and up to 19.7 % increase in faulting distress. An unbonded overlay designed with 28 days CTE value may not perform for the design life because of the increase in CTE with age progression.
Download or read book Field Measurement of Water cement Ratio for Portland Cement Concrete written by Amy M. Dowell and published by . This book was released on 2002 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Methods of Test for Coefficient of Linear Thermal Expansion of Concrete written by and published by . This book was released on 1954 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Coefficient of Thermal Expansion for Portland Cement Concrete Pavements for MEPDG Implementation written by Kim Sung-Hee and published by . This book was released on 2012 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement and Evaluation of the Thermal Expansion Coefficient of Rock Filled Concrete written by Jin-Ting Wang and published by . This book was released on 2013 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock-filled concrete (RFC), formed by pouring self-compacting concrete (SCC) into rock blocks, is a newly developed type of mass concrete. It is important to determine its coefficient of thermal expansion (CTE) in engineering applications. In this study the CTE of RFC was determined for the first time using thermal expansion tests. RFC with three rock rates was measured at different ages. Meanwhile, the CTEs of SCC and rock blocks were experimentally tested for subsequent numerical simulation and theoretical analysis. The CTE of RFC was then evaluated numerically and theoretically based on the constituent materials. A three-dimensional finite element model was built for the numerical simulation of the thermal expansion tests of RFC. In addition, two composite models were used for the theoretical evaluation of the CTE of RFC based on the material parameters of SCC and rock blocks. The obtained numerical and theoretical CTE values agree well with the experimental CTE value. The numerical simulation and theoretical formulas can be used to estimate the CTE of RFC, thereby overcoming the high cost of complex experimental measurements.
Download or read book Guide for the Local Calibration of the Mechanistic empirical Pavement Design Guide written by and published by AASHTO. This book was released on 2010 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide provides guidance to calibrate the Mechanistic-Empirical Pavement Design Guide (MEPDG) software to local conditions, policies, and materials. It provides the highway community with a state-of-the-practice tool for the design of new and rehabilitated pavement structures, based on mechanistic-empirical (M-E) principles. The design procedure calculates pavement responses (stresses, strains, and deflections) and uses those responses to compute incremental damage over time. The procedure empirically relates the cumulative damage to observed pavement distresses.
Download or read book Integrated Materials and Construction Practices for Concrete Pavement written by and published by . This book was released on 2006 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manual of integrated material and construction practices for concrete pavements.
Download or read book Measurement and Evaluation of Asphalt Concrete Thermal Expansion and Contraction written by Qinwu Xu and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal expansion and contraction (TE/TC) of asphalt concrete (AC) play a significant role in both the thermal fatigue and low-temperature cracking of AC pavements. This paper discusses a test method and procedure developed to determine the AC coefficients of thermal expansion and contraction (CTE and CTC, respectively). Cylindrical specimens were subjected to temperature variations in an environmental chamber and specimen deformations were measured using extensometers. Temperature was applied in the range of -5°C to 40°C during both expansion and contraction phases. A specimen made from ceramic with very low CTE/CTC was also tested so that the influence of the self TE/TC of extensometers could be accounted for, and therefore, the measured deformation of an AC specimen was properly adjusted. A finite element (FE) model was developed to simulate the thermal stresses and strains inside the specimen, and to provide means for reliable computation of CTE/CTC. For this FE model, required AC viscoelastic properties were determined from the dynamic modulus test. The CTE/CTC of AC were then determined by using the calibrated deformation-temperature relationship. The standard aluminum and rubber specimens were also tested for TE/TC within a temperature range to validate the developed test method and computation approach. It was found that the CTE/CTC of AC were nonlinear and temperature dependent. The CTE/CTC determined for the aluminum and rubber specimens were found to be close to the standard values, therefore, validating the proposed approach for determination of CTE/CTC of AC.
Download or read book Thin and Ultra thin Whitetopping written by Robert Otto Rasmussen and published by Transportation Research Board. This book was released on 2004 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 338: Thin and Ultra-Thin Whitetopping summarizes available information to document how state departments of transportation and others are currently using thin and ultra-thin whitetopping overlays among various pavement rehabilitation alternatives. The report covers all stages of the proper application of whitetopping overlays, including project selection, design, materials selection, construction, maintenance, and eventual rehabilitation or replacement.
Download or read book Predicting Potential Strength of Portland Cement Concrete written by West Virginia. Department of Highways and published by . This book was released on 1978 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
