A Study of Methods for the Determination of the Portland Cement Content of Hardened Concrete PDF Download
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Author: Charles L. Ford
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 68
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Book Description
Author: Charles L. Ford
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 68
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Book Description
Author: Treval Clifford Powers
Publisher:
ISBN:
Category : Paste
Languages : en
Pages : 17
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Book Description
Author: Alvin Davis
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 4
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Book Description
Author: Thomas John Van Dam
Publisher: Transportation Research Board
ISBN: 0309088356
Category : Technology & Engineering
Languages : en
Pages : 38
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Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 875
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Author: L. J. Minnick
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 14
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Book Description
Determination of the portland cement content of hardened concrete is often a matter of concern to engineers and chemists working with mortars and concretes. Unfortunately, a precise method of analysis has not been developed due to the many complexities of the material under test. Difficulties include the selection of representative samples, the presence of aggregate materials from unknown sources, the use of portland cements that differ substantially from an average composition, the presence of admixtures or additions (such as pozzolans or finely ground slag), the degree of hydration of the cement, the effect of carbonation as contrasted with hydration, and the effect of leaching of the concrete. In view of such formidable obstacles, chemical procedures demand that every effort should be made to obtain samples of the materials used in the concrete mixture. Where adequate information is obtained on the coarase and fine aggregate and cementing material, a reasonably accurate estimate of the cement content of hardened concrete can be made by chemical methods. In the absence of sufficient information on the source materials, assumptions must be made with respect to the amount of soluble substances that may be contributed to the analysis by the aggregate fractions and with respect to the ratio of aggregate materials present in the mixture. The assumptions affect the reliability of the test results. In some instances, the use of several schemes of analysis should be considered since the information derived from one method may assist in interpreting the results derived from an alternate method. This report outlines several methods that have been employed to determine the cement content of hardened concrete and indicates the reliability of the results that have been obtained, with emphasis being given to the procedure that is available as ASTM Test for Cement Content of Hardened Portland Cement Concrete (C 85). Results of cooperative tests undertaken by ASTM Committee C-9 to evaluate the reliability of the ASTM method of test are presented.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: WG. Hime
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 5
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Book Description
THE CHEMICAL ANALYSIS OF CONCRETE FOR PORTland cement content was covered by H. F. Kriege in the first edition of ASTM STP 169. Dr. L. John Minnick provided an excellent discussion of methods of analysis for portland cement content in ASTM 169A. The present writer extended the discussions in ASTM 169B and ASTM 169C to include analytical methods for other concrete components, and broadened the title from the "Cement Content" of the first two editions. This chapter in ASTM 169D extends analytical developments to the twenty-first century.
Author: Gerardo G. Clemeña
Publisher:
ISBN:
Category : Cement
Languages : en
Pages : 38
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Book Description
The method of selective solution by methanolic maleic acid, developed by Tabikh et. al for the determination of cement content in hardened concrete, was evaluated. It was found to be relatively simple and inexpensive, and is accurate to within ±1 percentage point cement at the 95% confidence level with the use of calibration curves. Such factors as aggregate and cement compositions, curing time, and water-cement ratio were investigated as to their effects on the method. Among these factors, aggregate composition was the only one found to have a significant effect on the analytical results. The determination of cement content by the measurement of the specific gravity increase in a methanolic maleic acid solution was also investigated, but was found to have unsatisfactory precision.
