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 Interrelations Between Cement and Concrete Properties written by Raymond Leonard Blaine and published by . This book was released on 1966 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Admixtures on the Thermal Expansion of Concrete written by Joseph C. Lynch and published by . This book was released on 1940 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concrete in Hot Environments written by I. Soroka and published by CRC Press. This book was released on 1993-09-16 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elevated temperatures are known to affect the properties of both fresh and hardened concrete. This book describes in detail these effects and explains the mechanisms involved with particular reference to their practical aspects.
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 Effect of the Temperature of the Cement on the Properties of Concrete written by William Lerch and published by . This book was released on 1950 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Cement Properties and the Thermal Compatibility of Aggregates on the Strength of Accelerated Cured Concrete written by DF. Orchard and published by . This book was released on 1974 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most research work on the effect of the thermal expansion of the constituents of concrete has concentrated chiefly on hardened concrete. Its resistance to heating and cooling and to freezing and thawing has been used for purposes of assessment. The works of different investigators have led to considerable contradiction and no definite conclusion can be drawn on the effect of differences between the coefficients of thermal expansion of the constituents of concrete. Findings show effects on the durability under repeated cycles of freezing and thawing and the compressive strength of concrete subjected to temperature change. There is some evidence that the relative expansions of the constituents of fresh concrete cause a reduction of its ultimate strength under conditions of accelerated curing.
Download or read book Portland Cement written by G. C. Bye and published by Thomas Telford. This book was released on 1999 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Portland cement is one of the most traditional of construction materials. Rising costs of the energy required for its manufacture and the increasing interest in understanding the mechanisms of concrete deterioration, as well as the importance of optimising the use of Portland cement in high quality concrete, have continued to sustain interest in this important material. This second edition of this popular book provides an up-to-date introduction to the raw materials and manufacturing processes of Portland cement. It gives an introductory account of cement composition, manufacture, quality assessment, hydration and the resulting microstructure-physical property relationships, and some mechanisms of the chemical degradation of hardened cement paste. The book is primarily intended for students of materials sciences and graduates in pure science or engineering entering the cement or concrete industries. However anyone requiring a good clear introduction to this material will find this book provides helpful information.
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 The Effect of Temperature on the Strength of Portland Cement Concrete Test Cylinders written by Walter C. Edgecomb and published by . This book was released on 1972 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Temperature on Properties of Concrete written by P. M. Desai and published by . This book was released on 1972 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interrelations Between Cement and Concrete Properties Sulfate expansion heat of hydration and autoclave expansion written by Raymond Leonard Blaine and published by . This book was released on 1965 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature and Concrete written by and published by . This book was released on 1971 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Changes in Characteristics of Portland Cement as Exhibited by Laboratory Tests Over the Period 1904 to 1950 written by H. F. Gonnerman and published by . This book was released on 1952 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Study of Concrete Properties to Support Implementation of the New AASHTO Mechanistic empirical Pavement Design Guide written by and published by . This book was released on 2012 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Certain Factors on the Properties of Portland Cement Concrete written by Thed Klung Hum and published by . This book was released on 1939 with total page 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:
