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Mohammed Alrumaih Thesis edit___final format approved LW 5-8-19.pdf (1.38 MB)
ETD Abstract Container
Abstract Header
Investigation of the Effect of Nano SiO
2
on Porosity
Author Info
Alrumaih, Mohammed Aulwai
ORCID® Identifier
http://orcid.org/0000-0002-5301-0152
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=dayton155744355992274
Abstract Details
Year and Degree
2019, Master of Science (M.S.), University of Dayton, Civil Engineering.
Abstract
Concrete is naturally porous and allows water to penetrate its surfaces. This water penetration can easily deteriorate the concrete and cause chemical attacks, weakening its durability and strength. Thus, improving porosity will improve its quality, durability, and life span. This study investigates ways to enhance concrete porosity without harming compressive and flexural strengths. This study focuses on adding nano SiO
2
(0%, 1%, 2%, 4% and 6%) while keeping constant the amount of fly ash (2%) and water cement ratio (0.41). The benchmark used was simply plain concrete without fly ash or nano SiO
2
. This was accomplished by testing a total of 36 cylinders after allowing the concrete to cure for 28 days. In this study, results show that porosity decreases with the addition of nano SiO
2
until it reaches (1%) optimum value, which is 5.9% lower than the plain concrete (without additive). However, the porosity altered after the 1% optimum value; porosity increased with the addition of 4% and 6% nano SiO
2
, but it was still lower than the concrete with fly ash and the plain concrete (without nano SiO
2
or fly ash). For compressive strength, the results show that among four different nano SiO
2
percentages, the addition of 2% nano SiO
2
with fixed 2% fly ash has a higher compressive strength, which is 17.3% greater than the strength of the reference 0% nano SiO
2
. However, the increase in compressive strength was altered after the addition of 2% nano SiO
2
. The addition of 4% and 6 % of nano SiO
2
decreased the compressive strength and lowered the workability of the mix. Once the optimum percentage of SiO
2
was found (1%) and making sure that no deterioration of compressive strength occurred, the flexural strength (rupture strength) was checked using a three-point method. Nine beams are used for the flexural test for 28 days; three of the nine beams use concrete with the optimum value from the porosity test. In the flexural test, the results show that the addition of 1% nano SiO
2
combined with 2% fly ash increased the flexural strength to a higher value than both concrete containing 2% fly ash and the plain concrete (without nano SiO
2
or fly ash).
Committee
Joseph Saliba, Ph.D (Advisor)
Thomas Whitney, Ph.D (Committee Member)
Ralph O’Quinn (Committee Member)
Pages
70 p.
Subject Headings
Civil Engineering
Keywords
Effect
;
Nano Silica
;
Nano SiO2
;
Concrete strength
;
concrete porosity
;
Flexural strength
Recommended Citations
Refworks
EndNote
RIS
Mendeley
Citations
Alrumaih, M. A. (2019).
Investigation of the Effect of Nano SiO
2
on Porosity
[Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton155744355992274
APA Style (7th edition)
Alrumaih, Mohammed.
Investigation of the Effect of Nano SiO
2
on Porosity.
2019. University of Dayton, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=dayton155744355992274.
MLA Style (8th edition)
Alrumaih, Mohammed. "Investigation of the Effect of Nano SiO
2
on Porosity." Master's thesis, University of Dayton, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton155744355992274
Chicago Manual of Style (17th edition)
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Document number:
dayton155744355992274
Download Count:
694
Copyright Info
© 2019, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.