Download or read book Development of an Unconfined Freeze thaw Test for Coarse Aggregates written by C. A. Rogers and published by . This book was released on 1988 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregates for use in asphaltic and Portland cement concrete are currently tested in the sulphate soundness test, intended to simulate the action of freezing and thawing on aggregate particles. The precision of this test is poor, and it does not have an excellent correlation with field performance. This paper describes the test procedure and ruggedness testing done during the development of an unconfined freeze-thaw test for coarse aggregate. Results of multilaboratory study of this test are also described and data on the correlation with field performance is presented.
Download or read book Development of an Unconfined Freeze thaw Test for Coarse Aggregates written by and published by . This book was released on 1988 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: The test method described in this paper consists of saturating a graded sample of aggregate in a 3% sodium chloride solution for 24 hours. the sample is then drained and submitted to five cycles of freezing at -18 c. and thawing at room temperature. the sample is then washed, oven-dried, and regraded on the original sieves. the amount passing each sieve is expressed as a percent loss by mass of the original mass. the within-laboratory and multilaboratory precision of this test is significantly better than that of the magnesium sulphate soundness test. for the covering abstract of the conference see irrd 807201.
Download or read book Evaluation of Canadian Unconfined Aggregate Freeze Thaw Tests for Identifying Nondurable Aggregates written by Santosh Kumar Mummaneni and published by . This book was released on 2011 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete is most widely used material in construction industry, which is made up of cement, water and aggregates as its major ingredients. Aggregates contribute to 60 to 75 % of the total volume of concrete. The aggregates play a key role in the concrete durability. The U.S Midwest has many aggregates that can show distress in the field under freezing and thawing conditions. The objective of this research was to determine if the Test Method for the Resistance of Unconfined Coarse Aggregate to Freezing and Thawing, method CSA A23.2-24A, could be used to differentiate good from poor performing aggregates in concrete. In this study fifty one KDOT aggregates (including twelve ledge and thirty nine production samples) were tested for freeze thaw resistance using CSA A23.2-24A test method and were compared to the results of the standard KDOT aggregate qualification tests. In addition to performing the CSA test method using a 3% sodium chloride solution, a subset of the aggregates were tested using either a 3% magnesium chloride or calcium chloride solution to determine the effects of the salt type on the aggregate performance. No correlation was found between the CSA A23.2-24A test method results and the standard KDOT aggregate qualification tests. The results also indicated that the mass loss in the CSA A23.2-24A was similar for the aggregate sizes tested. The use of alternate salt solutions like MgCl2 and CaCl2 resulted in increased freeze thaw mass loss in limestone aggregates.
Download or read book Development of Methods of Testing Aggregate Larger Than 1 1 2 Inch written by Rembert Leeroy Curry and published by . This book was released on 1966 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Testing Methods to Determine Long term Durability of Wisconsin Aggregates written by and published by . This book was released on 2013 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approximately 10 to 11 million tons of aggregates are utilized in transportation infrastructure projects in Wisconsin annually. The quality of aggregates has a tremendous influence on the performance and durability of roadways and bridges. In this Phase II research study, detailed statistical analyses were performed on over 1,000 sets of historical aggregate test results and the experimental results from the Phase I study. Test results from other states were analyzed as well. Aggregate tests were performed on 12 known marginal or poor Wisconsin aggregates to specifically address test performance of such aggregates. Selected aggregates were scanned using X-ray computed tomography to assess the effects of freeze-thaw and sodium sulfate exposure on the internal void system. The results of multi-parameter logistic regression analyses show that the pass/fail outcomes of the Micro-Deval test can be predicted when LA abrasion, absorption, and sodium sulfate soundness test results are known. The unconfined freeze-thaw test outcomes cannot be predicted from results of other tests (not correlated). Therefore, the unconfined freeze-thaw test should be part of any test protocol as it measures an aggregate characteristic that cannot be obtained from other tests. The percentiles associated with any proposed acceptance threshold limits for various aggregate tests should be determined using the statistical data provided.
Download or read book Testing Methods to Determine Long Term Durability of Wisconsin Aggregate Resources written by and published by . This book was released on 2005 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freeze thaw Evaluation of Large Coarse Aggregate Using MDOT s Confined and Unconfined Methods written by Will Hansen and published by . This book was released on 2004 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Critical Review of Literature Treating Methods of Identifying Aggregates Subject to Destructive Volume Change when Frozen in Concrete written by National Cooperative Highway Research Program and published by . This book was released on 1964 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aggregates in Concrete written by Mark Alexander and published by CRC Press. This book was released on 2010-02-25 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bringing together in one volume the latest research and information, this book provides a detailed guide to the selection and use of aggregates in concrete. After an introduction defining the purpose and role of aggregates in concrete, the authors present an overview of aggregate sources and production techniques, followed by a detailed study of their physical, mechanical and chemical properties. This knowledge is then applied to the use of aggregates in both plastic and hardened concretes, and in the overall mix design. Special aggregates and their applications are discussed in detail, as are the current main specifications, standards and tests.
Download or read book Development of a One cycle Slow Freeze Test for Identifying Aggregates Susceptible to Freeze thaw Detoration written by Harry Jimmylyle Pence and published by . This book was released on 1969 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lea s Chemistry of Cement and Concrete written by Peter Hewlett and published by Elsevier. This book was released on 2003-11-12 with total page 1087 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lea's Chemistry of Cement and Concrete deals with the chemical and physical properties of cements and concretes and their relation to the practical problems that arise in manufacture and use. As such it is addressed not only to the chemist and those concerned with the science and technology of silicate materials, but also to those interested in the use of concrete in building and civil engineering construction. Much attention is given to the suitability of materials, to the conditions under which concrete can excel and those where it may deteriorate and to the precautionary or remedial measures that can be adopted. First published in 1935, this is the fourth edition and the first to appear since the death of Sir Frederick Lea, the original author. Over the life of the first three editions, this book has become the authority on its subject. The fourth edition is edited by Professor Peter C. Hewlett, Director of the British Board of Agrement and visiting Industrial Professor in the Department of Civil Engineering at the University of Dundee. Professor Hewlett has brought together a distinguished body of international contributors to produce an edition which is a worthy successor to the previous editions.
Download or read book Significance of Tests and Properties of Concrete and Concrete Making Materials written by and published by ASTM International. This book was released on 1978 with total page 875 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freeze Thaw Testing of Coarse Aggregate in Concrete written by RH. Vogler and published by . This book was released on 1989 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The procedures used to evaluate the durability of coarse aggregate in concrete by freezing and thawing were determined by a survey. Results indicate that a number of state transportation agencies use freeze-thaw procedures in place of, or in addition to, sulfate soundness and other tests. However, each agency's procedure has unique aspects. ASTM Test Method for Resistance of Concrete to Rapid Freezing and Thawing (C 666) describes the procedures for freeze-thaw cycling and gives partial information on expressing test results, but ASTM has no standard procedure to guide the testing agency in important aspects such as: aggregate grading, aggregate moisture treatment and pretreatment, and concrete mixture proportioning (including cement content, air content of concrete, or curing procedure). The ASTM C 666 method of expressing results for change in length does not permit comparison between different aggregates. The information in this paper is intended to assist ASTM Committee C9 on Concrete and Concrete Aggregates in preparing a practice for evaluation of coarse aggregate in concrete by freezing and thawing.
Download or read book Geological Survey Occasional Paper written by Indiana. Geological Survey and published by . This book was released on 1974 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete and Cement Composites written by Chris L. Page and published by Elsevier. This book was released on 2007-06-30 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whilst most structures made using concrete and cement-based composites have not shown signs of premature degradation, there have been notable exceptions. In addition, there is increasing pressure for new structures to remain in serviceable condition for long periods with only minimal maintenance before being recycled. All these factors have highlighted the issues of what affects the durability of these materials in different circumstances and how material properties can be measured and improved. Durability of concrete and cement composites summarises key research on these important topics. After an introductory chapter, the book reviews the pore structure and chemistry of cement-based materials, providing the foundation for understanding the particular aspects of degradation which are discussed in the following chapters. These include dimensional stability and cracking processes, chemical and microbiological degradation of concrete, corrosion of reinforcing and prestressing steels, deterioration associated with certain aggregates, effects of frost and problems involving fibre-reinforced and polymer-cement composites. With its distinguished international team of contributors, Durability of concrete and cement composites is a standard reference for all those concerned with improving the service life of structures using these materials. Analyses a range of materials such as reinforced steel in concrete, pre-stressed concrete and cement composites Discusses key degradation phenomena such as cracking processes and the impact of cold weather conditions A standard reference for those concerned with improving the service life of structures using concrete and cement based composites
Download or read book Significance of Tests and Properties of Concrete and Concrete Making Materials written by C. H. Best and published by ASTM International. This book was released on 1985-02 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Expert knowledge based Systems for Cement and Concrete written by Lawrence J. Kaetzel and published by . This book was released on 1991 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
