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FINENESS OF DENSIFIED MICROSILICA AND DISPERSION IN CONCRETE MIXES

DESHINI, AMARENDRANATH

Abstract Details

2007, MS, University of Cincinnati, Engineering : Civil Engineering.
This study explores the effect of densification of microsilica on the mechanical and other engineering properties of concrete used on Ohio Department of Transportation (ODOT) projects. American Society for Testing and Materials (ASTM) C 1240 requires wet-sieved microsilica to pass a No. 325 sieve with no more than 10% retained. Densified microsilica samples submitted to ODOT sometimes do not meet this specification, since the sieving process may not be able to break the bonds formed due to densification. During this study, No. 325 sieve tests on three microsilica types (undensified, densified, and abused by prolonged exposure to moisture) were performed at the ODOT laboratory, but none of the materials tested were found to conform to the ASTM fineness specification. This calls into question the application of this procedure to assessing the suitability of densified microsilica for use in concrete. In contrast, the compressive and flexural strengths of concretes mixed with each of the three microsilica types exceeded those envisaged by ODOT Item 499.03 Concrete-General: Proportioning. As expected, undensified microsilica concrete yielded higher values than its densified and abused microsilica counterparts at all ages, but this advantage was rather limited. This was true for both natural and crushed coarse aggregate mixes. With very few exceptions attributable to material and testing variability, trends observed with regard to the effects of microsilica and coarse aggregate types, age and specimen size on the development of strength were also as anticipated. Therefore, it is concluded that densified microsilica can be used on ODOT projects for the construction of pavements and bridges.
Dr. ANASTASIOS IOANNIDES (Advisor)
224 p.

Recommended Citations

Citations

  • DESHINI, A. (2007). FINENESS OF DENSIFIED MICROSILICA AND DISPERSION IN CONCRETE MIXES [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186774530

    APA Style (7th edition)

  • DESHINI, AMARENDRANATH. FINENESS OF DENSIFIED MICROSILICA AND DISPERSION IN CONCRETE MIXES. 2007. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186774530.

    MLA Style (8th edition)

  • DESHINI, AMARENDRANATH. "FINENESS OF DENSIFIED MICROSILICA AND DISPERSION IN CONCRETE MIXES." Master's thesis, University of Cincinnati, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1186774530

    Chicago Manual of Style (17th edition)