Verifying the Calcium Oxychloride Threshold in Cementitious Pastes

<p>Calcium oxychloride (CAOXY) formation is a serious deterioration mechanism known to cause joint damage in concrete pavements. CAOXY is the product of a chemical reaction between calcium chloride (CaCl2) or magnesium chloride (MgCl) deicing salts and calcium hydroxide in the cementitious matrix. Currently, the accepted CAOXY threshold at which deterioration is mitigated in cementitious paste is 15 g/100 g paste (15 oz/100 oz paste); however, this limit was developed using flexural strength testing. For this investigation, the current threshold was evaluated using compressive strength and mass change over time in paste specimens exposed to CaCl2. Fly ash is used to replace cement (up to a 50% mass replacement) in order to limit CAOXY deterioration. While compressive strength reduction was observed in all specimens despite fly ash replacement level, the results generally validate the current CAOXY threshold level in cementitious paste determined from flexural strength testing. </p>

Name thesis:degree_name

Master of Science in Civil Engineering (MSCE)

Level thesis:degree_level

Thesis

Year dc:date.available

2020

Author dc:creator

• Traore, Fatoumata

Advisor dc:contributor.advisor

• Hale, W. Micah

Contributors dc:contributor

• Murray, Cameron D.
• Prinz, Gary S.

• calcium oxychloride
• compressive strength
• Deicing chemicals
• Low-temperature differential scanning calorimetry
• mass change
• Thermogravimetric analysis
• Civil Engineering
• Construction Engineering and Management
• Structural Engineering
• Transportation Engineering

Repository record dc:identifier

https://scholarworks.uark.edu/etd/3757

OAI identifier oai:identifier

oai:scholarworks.uark.edu:etd-5307