Date of Graduation

12-2018

Document Type

Thesis

Degree Name

Bachelor of Science in Civil Engineering

Degree Level

Undergraduate

Department

Civil Engineering

Advisor/Mentor

Wood, Clinton

Committee Member

Hale, W. Micah

Abstract

The main purpose of this research is to compare two nondestructive methods to assess Alkali-Silica reaction (ASR) in concrete. Fifteen concrete prisms were cast using aggregates with different Alkali-Silica reactivity such as Jobe sand and Van Buren sand. The change in strain, shear wave velocity and Young’s modulus were determined according to ASTM C129 and ASTM C215, respectively. This data was collected by Dillon K Self, who determined that the shear wave velocity and strain are inversely proportional. However, when single cracking in the concrete specimen transition to map cracking, the shear wave velocity dropped significantly, whereas the strain value does not. Thus, the shear wave velocity is more sensitive than strain measurements to determine the damage caused by (ASR) in concrete. The Young’s modulus data was analyzed and compared to the results obtained from Self’s experiments using shear wave velocity. Young’s Modulus of the concrete prisms typically follows the same trends as shear wave velocity with strain increasing the Young’s modulus decreases. The percent decrease in Young’s modulus is similar to the percent decrease in shear modulus, and both occur at nearly the same rate and specimen age. Thus, Young’s modulus and shear modulus provide a good estimate to assess concrete conditions.

Keywords

Young's modulus; shear modulus; shear wave velocity; seismic methods; Alkali-Silica Reaction; nondestructive methods; Service learning

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