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Effect Of Elevated Curing Temperature On The Chloride Permeability Of High Strength Lightweight Concrete
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Book Synopsis Effect of Elevated Curing Temperature on the Chloride Permeability of High-Strength Lightweight Concrete by : OE. Gjørv
Download or read book Effect of Elevated Curing Temperature on the Chloride Permeability of High-Strength Lightweight Concrete written by OE. Gjørv and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to high cement contents and reduced heat capacity, high-strength lightweight concrete is often exposed to elevated curing temperatures. In the production of lightweight concrete the aggregate is often wetted before use, but sometimes dry aggregate is also applied. In order to find out whether elevated curing temperatures in combination with varying moisture conditions of the aggregate would affect the concrete permeability, an experimental investigation was carried out. The results showed that maximum curing temperatures of up to 80°C did not adversely affect the compressive strength when dry aggregate was used, while a temperature above 50°C reduced the compressive strength when wet aggregate was employed. Temperatures above 65°C increased the permeability in both cases of aggregate moisture condition. At 20°C the compressive strength was higher for the wet aggregate concrete (103.8 MPa) compared to that of the dry aggregate concrete (95.3 MPa), but the permeability was also higher for the wet aggregate concrete (150%). When all the moisture was removed at 105°C, the wet aggregate concrete absorbed approximately 15% more water by capillary absorption than the dry aggregate concrete. Backscattered electron images showed a very dense transition zone between cement paste and aggregate both for the dry and the wet aggregate concrete.
Book Synopsis Effects of Temperature on the Development of Low Permeability in Concretes by : Hamdi Celik Ozyildirim
Download or read book Effects of Temperature on the Development of Low Permeability in Concretes written by Hamdi Celik Ozyildirim and published by . This book was released on 1998 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the effects of temperature on the strength and permeability of concretes containing pozzolans (fly ash and silica fume) and slag. Two test programs were conducted. In the first, one control and five experimental mixtures containing silica fume, fly ash, or slag were evaluated. In the second, one control and three experimental mixtures containing fly ash or slag at a higher water-cementitious material ratio (W/CM) than used in the first program were evaluated. Concretes cured at higher temperatures had higher strengths up to 28 days but lower strengths at 1 year. Permeability decreased with time. Increasing early curing temperatures enabled the achievement of lower long-term permeability for 6 months and beyond at 28 days. Concretes containing a pozzolan or slag had a lower long-term permeability than the control. Adding a pozzolan was more effective in reducing permeability than reducing the W/CM. At cold temperatures, if the specified properties are not achieved, the contractor should change the mix design and/or provide insulating blankets and/or external heat to ensure the desired product.
Book Synopsis The Influence of Steam Curing on the Chloride Resistance of High Performance Concrete by : Melissa Prevey Titherington
Download or read book The Influence of Steam Curing on the Chloride Resistance of High Performance Concrete written by Melissa Prevey Titherington and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam curing is often used in the production of precast concrete. The elevated temperature of steam curing increases the initial rate of strength development allowing for earlier removal of the formwork. Although elevated curing temperatures result in high early strength, long-term strength and durability may be adversely affected. In this study, the chloride penetration resistance of steam-cured concretes containing silica fume alone or in combination with slag was investigated. The water to cement ratio was kept constant, at 0.3, for all concretes. Testing included: (1) Compressive Strength, (2) Rapid Chloride Permeability, (3) Water Sorptivity, (4) Bulk Diffusion, and (5) Chloride Migration. For a given mixture, steam curing was found to decrease chloride resistance. However, the use of supplementary cementing materials significantly reduced the negative effects of steam curing. The performance of a 4% silica fume steam-cured concrete was comparable to that of a 100% OPC ambient-cured concrete.
Book Synopsis Report 41: Internal Curing of Concrete - State-of-the-Art Report of RILEM Technical Committee 196-ICC by : Ole Mejlhede Jensen
Download or read book Report 41: Internal Curing of Concrete - State-of-the-Art Report of RILEM Technical Committee 196-ICC written by Ole Mejlhede Jensen and published by RILEM Publications. This book was released on 2007 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrated Design and Environmental Issues in Concrete Technology by : K. Sakai
Download or read book Integrated Design and Environmental Issues in Concrete Technology written by K. Sakai and published by CRC Press. This book was released on 2014-04-21 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The two themes of integration of structural and durability design, and integration of concrete technologies in relation to global environmental issues are drawn together in this book. It presents the views of distinguished international researchers and engineers on these key topics as the 21st century approaches. Derived from a workshop on rational
Book Synopsis The Influence of Fly Ash and Early-age Curing Temperature on the Durability and Strength of High Performance Concrete by : Christopher Michael Evans
Download or read book The Influence of Fly Ash and Early-age Curing Temperature on the Durability and Strength of High Performance Concrete written by Christopher Michael Evans and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early-stage curing temperature has a significant effect on high performance concrete durability and strength. Concrete cures at high temperatures when poured in large volumes due to the autogeneous heat generated by the hydration reactions of cementitious materials. The addition of supplementary cementing materials to concrete reduces the heat of hydration and extends the service life in structures by improving both long term durability and strength. This thesis investigates the effects of early-age curing temperature on the durability and strength of silica fume and fly ash modified concretes. Accelerated test methods were used to measure chloride diffusion in concretes produced with silica fume cement (T10SF) and various levels and types of fly ash replacement. The concrete mix determined to be the most durable with respect to chloride diffusion had 56% of the Type 10SF cement replaced with a moderate-level calcium content fly ash. The use of the Rapid Chloride Permeability Test, (ASTM C 1202, AASHTO T 277) has been widely criticised. Despite a limited data set, good correlation was shown in the results of this research between a two-chamber accelerated chloride migration cell test, and the RCPT.
Book Synopsis Role of Heat Curing in Concrete Durability by : Stephen Okurut Ekolu
Download or read book Role of Heat Curing in Concrete Durability written by Stephen Okurut Ekolu and published by . This book was released on 2004 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase One investigation was conducted to determine the effect of high-temperature curing on the physical properties of concrete. Portland cement pastes of 0.35 and 0.45 water-cement ratios, and ternary cement (5% silica fume, 25% slag) concretes of 0.35 water-cementitious ratio were cured at 23, 65, 80, and 95°C. The properties examined were the compressive strength, chloride permeability, bulk diffusion, salt scaling, rebar corrosion, pore structure, and microstructure. Results showed that there were drastic changes in concrete properties as the curing temperatures increased above 65°C. This has been termed the 'critical temperature effect'. Salt scaling of concretes was highly sensitive to elevated curing temperatures but the w/c was found to be more influential. Most adverse effects of heat curing were significantly mitigated by using ternary cement concrete except in the case of compressive strength.--Phase Two investigation examined the influence of other deterioration processes on the potential for DEF. The effects of lithium admixtures, alkali-silica reaction and freeze-thaw microcracks, and chloride ingress were investigated using concretes of 0.45 w/c and mortars of o.47 w/c heat cured at 95°C. Studies included X-ray diffraction and differential thermal analysis. It was found that the use of lithium admixture in cementitious systems controls DEF. Also, externally applied chlorides have a pessimum effect on expansion due to DEF. This deviates from the commonly held view that chlorides mitigate sulphate attack in concretes. A mechanism describing the pessimum effect of chlorides on DEF expansion has been proposed.
Book Synopsis Role of Heat Curing in Concrete Durability [microform] : Effects of Lithium Salts and Chloride Ingress on Delayed Ettringite Formation by : Stephen Okurut Ekolu
Download or read book Role of Heat Curing in Concrete Durability [microform] : Effects of Lithium Salts and Chloride Ingress on Delayed Ettringite Formation written by Stephen Okurut Ekolu and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase One investigation was conducted to determine the effect of high-temperature curing on the physical properties of concrete. Portland cement pastes of 0.35 and 0.45 water-cement ratios, and ternary cement (5% silica fume, 25% slag) concretes of 0.35 water-cementitious ratio were cured at 23, 65, 80, and 95°C. The properties examined were the compressive strength, chloride permeability, bulk diffusion, salt scaling, rebar corrosion, pore structure, and microstructure. Results showed that there were drastic changes in concrete properties as the curing temperatures increased above 65°C. This has been termed the 'critical temperature effect'. Salt scaling of concretes was highly sensitive to elevated curing temperatures but the w/c was found to be more influential. Most adverse effects of heat curing were significantly mitigated by using ternary cement concrete except in the case of compressive strength.--Phase Two investigation examined the influence of other deterioration processes on the potential for DEF. The effects of lithium admixtures, alkali-silica reaction and freeze-thaw microcracks, and chloride ingress were investigated using concretes of 0.45 w/c and mortars of o.47 w/c heat cured at 95°C. Studies included X-ray diffraction and differential thermal analysis. It was found that the use of lithium admixture in cementitious systems controls DEF. Also, externally applied chlorides have a pessimum effect on expansion due to DEF. This deviates from the commonly held view that chlorides mitigate sulphate attack in concretes. A mechanism describing the pessimum effect of chlorides on DEF expansion has been proposed.
Book Synopsis Cement, Concrete and Aggregates by : American Society for Testing and Materials
Download or read book Cement, Concrete and Aggregates written by American Society for Testing and Materials and published by . This book was released on 1994 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of High Temperature Curing on the Compressive Strength of Concrete by : David Campbell Wallace
Download or read book The Effect of High Temperature Curing on the Compressive Strength of Concrete written by David Campbell Wallace and published by . This book was released on 1941 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Science and Engineering by :
Download or read book Concrete Science and Engineering written by and published by . This book was released on 1999 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Placing and Curing Temperatures on Properties of Concrete by : Pankaj A. Desai
Download or read book Effect of Placing and Curing Temperatures on Properties of Concrete written by Pankaj A. Desai and published by . This book was released on 1963 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Accelerated Curing on Surface Resistivity and Rapid Chloride Permeability of High Performance Concrete by : Michael Salvador
Download or read book Effect of Accelerated Curing on Surface Resistivity and Rapid Chloride Permeability of High Performance Concrete written by Michael Salvador and published by . This book was released on 2013 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, many bridges have been built using High Performance Concrete (HPC) to increase their durability. However, when subjected to cracking or exposed to aggressive environments, their durability gradually diminishes, causing corrosion of reinforcement in the deck. This phenomenon is one of the major factors causing delamination and structural deficiencies of concrete decks. The corrosion risk is directly related to the chloride ion permeability of the concrete, which can be determined using permeability testing at a minimum of 56 days. Since the permeability testing is time consuming and labor-intensive, many of State Department of Transportations (DOT's) are exploring the use of more expedient and less variable testing methods. To evaluate the long-term durability aspects of HPC at an earlier acceptance age but with a lower cost, two new tests are investigated as potential replacements: accelerated curing and concrete resistivity measurement. There is a need to understand the effect of accelerated curing on concrete resistivity and chloride ion permeability as a measure of durability. This paper describes an experimental program to evaluate the effects of accelerated curing on durability performance of HPC. The Surface Resistivity (SR) and the Rapid Chloride Permeability (RCP) and Rapid Migration (RM) tests were performed on concrete cylinders cured under accelerated as well as normal wet curing conditions. Results show that the SR test can substitute the RCP and RM tests with moderate accuracy. Moreover, accelerated curing can expedite the time needed to test permeability, reducing the cost to both DOT's and contractors. SR testing combined with accelerated curing correlated well with results from RCP and RM testing, providing a vast reduction in expenses.
Book Synopsis Effect of Initial Curing Temperatures on the Compressive Strength and Durability of Concrete by :
Download or read book Effect of Initial Curing Temperatures on the Compressive Strength and Durability of Concrete written by and published by . This book was released on 1952 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultra-High-Pumpability and High Performance Concrete Technology by : Hao Wen Ye
Download or read book Ultra-High-Pumpability and High Performance Concrete Technology written by Hao Wen Ye and published by Trans Tech Publications Ltd. This book was released on 2009-01-13 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The main theme of this special collection was the preparation and properties of high-strength/high-performance concrete, and covered a wide range of topics and scopes, such as preparation of high strength/high performance concrete, durability, raw materials, workbility, chemical admixture, new applications of concrete, property characterization, and the behavior of concrete structures.
Book Synopsis Dynamic Behavior of Materials by : Marc A. Meyers
Download or read book Dynamic Behavior of Materials written by Marc A. Meyers and published by John Wiley & Sons. This book was released on 1994-10-28 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addresses fundamentals and advanced topics relevant to the behavior of materials under in-service conditions such as impact, shock, stress and high-strain rate deformations. Deals extensively with materials from a microstructure perspective which is the future direction of research today.
Book Synopsis Curing Temperature Effects on Type S, Shrinkage Compensated, Lightweight Concrete by : James E. Teague
Download or read book Curing Temperature Effects on Type S, Shrinkage Compensated, Lightweight Concrete written by James E. Teague and published by . This book was released on 1972 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted to determine curing temperature effects on a restrained, shrinkage compensated, Type S, lightweight concrete. The cement content was 6.73 SCY and the aggregate was haydite. Temperatures used were 50F, 61F, 72F and 93F. The physical properties observed were expansions, compressive strengths and stress-strain relations. These data were correlated to x-ray intensity ratios for the strength-producing tobermorite and the expansion-producing ettringite. (Author).
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