Download or read book Freeze thaw Durability of Concrete with Natural and Recycled Concrete Aggregates Using Air Entraining Admixture written by Salman Sulaiman and published by . This book was released on 2016 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freezing and thawing cycles is one of the most damaging factors that affect the durability of concrete. The damages caused by the cyclic freeze-thaw action can be divided into two factors. The first factor is an increase in internal crack, which causes the loss in relative dynamic modulus (RDM) of the concrete and the second factor is surface scaling, which leads to weight loss of the concrete. In this study, the durability of concrete made by replacing natural coarse aggregates (NCA) with various percentages of recycled concrete aggregates (RCA). Also some tests have been conducted with the addition of air entraining admixture (AEA). Prior to mixing the concrete, both NCA and RCA were characterized to determine their suitability as a construction material. Concrete mixes consisting of 0, 20, 40, 60, 80, and 100% replacement (by weight) of NCA with RCA were prepared. The same concrete mixes were prepared again but with the addition of an air entraining admixtures (AEA). All specimens were tested for compressive strength after a curing period of 7, 14, and 28 days. The compressive strength of the concrete made with different percentage of RCA decreases as the percentage of RCA increases. After 28 days of curing, samples with 0, 40, and 100% replacement of NCA with RCA were placed in the freeze-thaw chamber along with 0, 20, 40, 60, 80, and 100% NCA replacement containing AEA. After several cycles of freezing and thawing; the RDM, change in weight and change in length were measured. In this study loss of RDM and weight loss were noticed, as the cyclic freeze-thaw increases. It has also been observed that concrete mixes containing AEA were still durable after 300 cycles of freezing and thawing; however, the specimens without AEA failed before 150 cycles.
Download or read book Freeze Thaw Durability of Concrete written by J. Marchand and published by CRC Press. This book was released on 2004-03-01 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete durability in climates where freezing and thawing occurs is a continuing problem. It is particularly acute for highway and bridge structures, where de-icing salts are used to combat the effects of frost, snow and ice. These salts can cause damage to concrete and accelerate corrosion of reinforcements. This book presents the latest international research on this area, with contributions from North America and Europe which were presented at an international RILEM workshop.
Download or read book Freezing and Thawing of Concrete written by William A. Cordon and published by . This book was released on 1966 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discussion of the behaviour of various concrete structures exposed to freezing and thawing is followed by theories regarding mechanisms which cause this behaviour, and methods of preventing concrete deterioration.
Download or read book Investigation of Resistance of Preplaced aggregate Concrete to Freezing and Thawing written by William O. Tynes and published by . This book was released on 1968 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freeze thaw Durability of Aggregate in Concrete written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1956 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paper 1 presents laboratory freeze-thaw results as well as field observations on the major Michigan aggregate sources and is considered a first step in formulation of a policy regarding acceptance of future aggregates of unknown service behavior.
Download or read book Effect of Entrained Air on Recycled Concrete Prasoperties written by CJ. Zega and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air entrainment is a good practice to improve the durability of concrete exposed to cycles of freezing and thawing. For a given admixture dosage, the air content will depend on mix proportions and the characteristics of the materials employed. The use of crushed waste concretes (recycled coarse aggregates), which have different characteristics and properties compared to natural coarse aggregates, could modify the air content and behavior of recycled concretes. In this paper, some fresh and hardened state properties of entrained air recycled concretes were evaluated and compared with those of entrained air conventional concrete. Recycled concretes were elaborated with 50, 75, and 100% replacement by volume of natural coarse aggregates by crushed waste concretes. The results indicate that the recycled concretes show a satisfactory mechanical and durable behavior, similar to or better than that of conventional one.
Download or read book Air Entrainment in Concrete Design written by Waterways Experiment Station (U.S.) and published by . This book was released on 1947 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete in Cold Climates written by M. Pigeon and published by CRC Press. This book was released on 2014-04-21 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and authoritative review of durability of the frost resistance of concrete. It will enable both concrete materials specialists and practising engineers to better understand the deterioration processes which take place during freezing and thawing, and the effects of de-icing salts on concrete. It shows how test pro
Download or read book Effect of Entrained Air on Resistance to Accelerated Laboratory Freezing and thawing of Concrete Specimens Made with Expanded Lightweight Aggregates written by Waterways Experiment Station (U.S.) and published by . This book was released on 1958 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freeze and Thaw Durability of Air entrained Concrete Using Indiana Aggregates written by Jack B. Blackburn and published by . This book was released on 1949 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete written by National Research Council (U.S.). Highway Research Board. Committee on Durability of Concrete, Physical Aspects and published by . This book was released on 1957 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 written by Rishi Gupta and published by Springer Nature. This book was released on with total page 1270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Use of Recycled Concrete as Aggregate written by Alan D. Buck and published by . This book was released on 1972 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supplies of natural mineral aggregates are diminishing as their usage increases. Disposal problems exist because of steadily increasing accumulation of solid wastes. In light of these two situations an investigation was made to evaluate the use of crushed waste concrete as concrete aggregate. If such use is practical, it will help to alleviate both problems. A discarded concrete driveway that contained siliceous aggregates and a laboratory concrete beam that contained limestone as coarse aggregate and natural siliceous sand as fine aggregate were selected. Portions of each kind of concrete were processed into aggregate sizes. Three test mixtures and two control mixtures were made. Specimens from each round of each mixture were tested for compressive strength at different ages up to six months, for resistance to accelerated freezing and thawing, and for volume changes due to temperature changes or to moisture effects at a constant temperature. The aggregate particles produced by crushing concrete had good particle shape, high absorption, and low specific gravity by comparison with conventional natural mineral aggregates. Other results revealed that use of crushed concrete as aggregate (a) had no significant effect on mixture proportions or workability, (b) resulted in slightly lower compressive strengths, (c) had no significant effect on volume response of specimens to temperature or moisture effects, and (d) resulted in a significant increase in frost resistance when the crushed driveway concrete was used, but essentially no effect on frost resistance when the crushed beam was used.
Download or read book Freeze thaw Resistance of Concrete with Marginal Air Content written by Jussara Tanesi and published by . This book was released on 2006 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freeze-thaw resistance is a key durability factor for concrete pavements. Recommendations for the air void system parameters are normally: 6 ± 1 percent total air, and spacing factor less than 0.20 millimeters. However, it was observed that some concretes that did not possess these commonly accepted thresholds presented good freeze-thaw resistance in laboratory studies. This study evaluated the freeze-thaw resistance of several "marginal" air void mixes, with two different types of air-entraining admixtures (AEA)-a Vinsol resin and a synthetic admixture. This study used rapid cycles of freezing and thawing in plain water, in the absence of deicing salts. For the specific materials and concrete mixture proportions used in this project, the marginal air mixes (concretes with fresh air contents of 3.5 percent or higher) presented an adequate freeze-thaw performance when Vinsol resin based air-entraining admixture was used. The synthetic admixture used in this study did not show the same good performance as the Vinsol resin admixture
Download or read book Frost Resistance of Concrete written by R Auberg and published by CRC Press. This book was released on 2004-03-01 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book forms the proceedings of the international workshop to be held in Essen, Germany. This workshop summarises the conclusion of the technical committee's investigations into the resistance of concrete to freeze-thaw attack, specific in this to resistance with or without de-icing chemicals. It presents the RILEM recommendations on testing the freeze-thaw and de-icing salt resistance of concrete.
Download or read book Effect of Degree of Synthetic Lightweight Aggregate Pre wetting on the Freeze thaw Durability of Lightweight Concrete written by C. N. Kanabar and published by . This book was released on 1966 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freeze thaw Durability of Non air Entrained Concrete with Normal and Lighweight Aggregates written by Steven R. Matheny and published by . This book was released on 2010 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
