Download or read book Evaluation of water reducing admixtures in portland cement concrete with high amounts of microfine aggregate written by Scott Ronald Witthoft and published by . This book was released on 2000 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Certain Set retarding and Water reducing Admixtures for Portland Cement Concrete written by Wisconsin. State Highway Commission. Materials Testing Laboratory and published by . This book was released on 1963 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Admixtures for Use in Concrete to be Placed Underwater written by William O. Tynes and published by . This book was released on 1976 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Admixtures for Concrete Improvement of Properties written by E. Vazques and published by CRC Press. This book was released on 2004-11-23 with total page 653 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical admixtures are used to modify the properties and behaviour of fresh and hardened concrete. They enable more economic construction and the achievement of special properties such as high strength or durability. This book presents new research information from an International RILEM Symposium on six main topics: workability, setting, strength, durability, other properties and technology.
Download or read book Investigation of Water reducing Admixtures for Concrete written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1961 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluating Air entraining Admixtures for Highway Concrete written by Mohamad Nagi and published by Transportation Research Board. This book was released on 2007 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report presents a recommended procedure for evaluating air-entraining admixtures used in highway concrete. The procedure involves the testing of non-air-entrained concrete and concrete containing the air-entraining admixture under simulated field conditions. Criteria are proposed for acceptance of admixtures for use in either highway pavements or structures. The recommended procedure and acceptance criteria will guide materials engineers in evaluating and selecting air-entraining admixtures that should contribute to appropriate freeze-thaw durability and thus to good performance and long service life. The content of the report will be of immediate interest to materials engineers, researchers, and others concerned with the design of concrete mixtures for use in highway pavements and structures."--taken from Foreword, page [v].
Download or read book The Behavior of Admixtures of Portland Lumnite Cements written by Meyer Hecht and published by . This book was released on 1925 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concrete Admixtures written by V.H. Dodson and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Water reducing Admixtures on Properties of Cement Paste written by D. L. Kantro and published by . This book was released on 1981 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of Cement replacement Materials written by William O. Tynes and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purposes of the investigation were to evaluate the effects of certain water-reducing admixtures on the workability, heat generation, strength, cost, and other characteristics of mass concrete mixtures containing large amounts of pozzolan and small amounts of portland cement. Four chemical admixtures were tested for compliance with Corps of Engineers specifications and three were selected for use in the tests of mass concrete. Mass concrete mixtures were proportioned with and without pozzolans. Results of tests on workability, compressive strength, and heat generation, and cost comparison were used in evaluating the performance of chemical admixtures in mass concrete. (Author).
Download or read book Symposium on Effect of Water reducing Admixtures and Set retarding Admixtures on Properties of Concrete written by and published by ASTM International. This book was released on 1960 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Super water Reducers for Highway Applications written by David Whiting and published by . This book was released on 1981 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Super-Water Reducers" were characterized and evaluated as potential candidates for production of low water-to-cement ratio, high strength concretes for highway construction applications. Admixtures were composed of either naphthalene or melamine sulfonated formaldehyde condensates. A mini-slump procedure was used to assess dosage requirements and behavior of workability with time of cement pastes. Required dosage was found to be a function of tricalcium aluminate content, alkali content, and fineness of the cement. Concretes exhibited high rates of slump loss when super-water reducers were used.
Download or read book Investigation of Proprietary Admixtures written by K. L. Saucier and published by . This book was released on 1980 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Mineral Admixtures and Coarse Aggregate Size on Compressive Strength and Freeze thaw Resistance of Portland Cement Concrete written by Thomas Francis McDonnell and published by . This book was released on 2007 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Ohio Department of Transportation (ODOT) has developed a series of portland cement concrete mix designs for use on all infrastructure projects throughout the state. The standard forms of these mix designs differ in terms of the compressive strength they are expected to achieve after a curing period of 28 days. Because of the state's climate, one requirement common to every mix design used by ODOT, however, is high resistance to damage from cycles of freezing and thawing. Options currently permitted by ODOT for varying these mix designs include the use of different coarse aggregate sizes and substitution of a portion of the portland cement with additional fine aggregate or one of three mineral admixtures. These admixtures include fly ash, ground granulated blast furnace slag (GGBFS) and micro silica. All of these admixtures are produced from materials that are recycled from processes unrelated to concrete production. These processes include coal fired steam generation, pig iron production and silicon manufacturing.The objective of the research presented in this thesis was to evaluate the effect that mineral admixtures and coarse aggregate on ODOT Class C (4,000 psi) concrete in terms of compressive strength and freeze-thaw resistance. These evaluations were performed through laboratory testing of specimens cast from individual mixes. Information is provided on the materials used to create a concrete mix, as well as a brief summary of the development of mix design methodologies. Detailed descriptions of the freeze-thaw resistance and compressive strength testing are also included, with a discussion of the associated mechanisms of failure. Conclusions are offered based on trends observed from analysis of the test data. In general, the results of the testing indicate that freeze-thaw resistance is not detrimentally influenced by the addition of mineral admixtures or the size of the coarse aggregate used. Each of the mineral admixtures does affect the resulting concrete mix in slightly different ways, and one may be more desirable than another based on required performance. In addition, all of the mix designs studied attained average compressive strengths in excess of the target value of 4,000 psi.
Download or read book Effectiveness of Mineral Admixtures in Preventing Excessive Expansion of Concrete Due to Alkali aggregate Reaction written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1958 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Performance of Concrete Admixtures written by M. R. Hansen and published by . This book was released on 1998 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project investigated compatibility problems involving two concrete admixtures from W.R. Grace Products and Dacotah portland cement. The problems experienced by the South Dakota Department of Transportation (SDDOT) were described as rapid slump loss, premature stiffening, and low compressive strengths. The materials investigated in this report are commonly used by the SDDOT in concrete construction projects. The research objectives were met by performing mortar and concrete flow table tests to verify compatibility between Dacotah cement and a high-range water-reducing admixture (HRWRA) and a retarder. The flow table tests were also used to determine an optimum time of addition for the admixtures. A five factorial statistical design to create thirty-three concrete mix designs was used in an effort to reproduce a compatibility problem. Finally, a field demonstration project was conducted to verify compatibility between the cement and admixtures under field conditions. Maximum dosages of each admixture were used in an attempt to create a compatibility problem. The mortar flow table test of Type V cement and HRWRA exhibited an optimum time of addition of the admixture to be at four minutes. The retarder showed no effect on the flow table results. Concrete mortar flow table results showed an improved performance with delayed addition of both the HRWRA and retarder. Analysis of the 33 concrete mixtures showed no general incompatibility between the cement and admixtures when the manufacturers' recommended mixing procedures were followed. The field demonstration displayed incompatibility between the cement and both admixtures; however, both admixtures were used at the maximum recommended dosages.
Download or read book The Effect of an Admixture Upon Water Loss and Water Gain in Portland Cement Concrete written by Elton Leigh Harden and published by . This book was released on 1939 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
