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Date of Award


Document Type

Campus Access Master's Thesis

Degree Name

Master of Science in Civil Engineering (MS)

Administrative Home Department

Department of Civil and Environmental Engineering

Advisor 1

Qingli Dai

Committee Member 1

Zhanping You

Committee Member 2

Shiyue Fang


In this study different modification methods of rubber aggregate were investigated to enhance the bonding strength between rubber particles and cement paste. Five types of modified rubber particles (NaOH-treated rubber, NaOH-treated rubber coated with normal cement, NaOH-treated rubber coated with cement containing silica fume, NaOH-treated rubber coated with cement containing silica fume plus sodium silicate, silane coupling agent treated rubber coated with normal cement) were employed in this study to replace 15% of fine aggregate by volume. The mechanical and durability tests were performed on concrete samples with pre-modified rubber aggregate. The mechanical test results showed that NaOH-treated rubber samples have the best performance on compressive strength among other types of rubber concrete samples. The samples containing an increased content of NaOH-treated rubber aggregate were used to further investigate the properties of rubberized concrete and mortar. The results of the durability tests demonstrate that concrete with the proper rubber aggregate content ( less than 25% ) have better resistance to the deterioration caused by freeze/thaw cycles compared to plain concrete. The ASR expansion can be reduced by the rubber aggregate in the concrete. The improvement in durability was more significant in the modified rubber concrete. Although the drying shrinkage of the rubberized concrete was higher than that of plain concrete, the results showed that NaOH treatment can decrease the change in length of rubberized concrete caused by drying shrinkage.