Major

Civil Engineering - Cooperative Education

Degree Name

Bachelor of Science

Date of Graduation

Spring 2019

Abstract

The research performed through this project provided some interesting results on how the different properties of the contaminated sediment can impact the strength of the new concrete.

Average three, seven, and fourteen-day strengths increased when comparing to the baseline mix developed for the experiment. Increases in strengths were notices in the ten and twenty-five percent soil replacement mixes. The largest increase was approximately thirty-three percent greater than the baseline average.

The results from the forty percent replacement test showed a significant decrease in strengths when comparing against the baseline mix. A loss of about thirty percent was observed between the average strengths of the two mixes. These results show the amount of substituted soil reaches a peak strength around a thirty-two percent replacement.

When testing mixes that contained a substitution of fifty and seventy-five percent soil replacements, seven-day strengths were able to achieve around fifty percent of the seven-day baseline strength. The results from concrete made with one-hundred percent soil-sand replacement only achieved about fifteen percent of the seven-day baseline strengths. Tests using high percentages of substituted soil show that the concrete can still achieve strengths high enough to out-match typical low strength mixes.

In all, this research shows that the contaminated sediment can provide a boost to concrete strength when used in low quantities or, if used in large quantities, can achieve strengths exceeding the requirements for industry grade controlled low strength material.

Research Sponsor

Dr. Stephen Duirk

First Reader

Dr. David Roke

Second Reader

Dr. Christopher Miller

Comments

Future research will be made regarding the incorporation of different cementitious materials such as fly ash or slag cement. These will allow for a even more environmentally friendly concrete mix and reduce the over carbon foot print. More research will be done to find the peak ratio of contaminated sediment and construction sand so that the concrete can achieve the highest strengths possible and potentially be used as a structural material.

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