Calcium Oxychloride Deteriorated Cementitious Paste

Research was conducted to determine the impact of calcium oxychloride deterioration on cementitious paste specimens. Four fly ash types were investigated and specimens were cast with 0, 10, 20, 30, 40, and 50% fly ash (mass) and cured for 91-days. During curing, compressive strength was tested at 1, 7, 28, 56 and 91-day intervals. At 91-days, the remaining specimens were removed from the curing tank, cleaned, and mass measurements were taken. The specimens were then stored in a 30% calcium chloride solution at 5 degrees Celsius for 91-days. During storage in solution, the specimens were tested for compressive strength loss as well as mass change at 1, 7, 28, 56, and 91-days. Strength loss and mass change are recorded as part of this dataset. Further, following the 91-day curing time frame, specimens were tested using thermogravimetric analysis (TGA) and low-temperature differential scanning calorimetry (LT-DSC). TGA was used to determine the amount of calcium hydroxide available in each mixture while LT-DSC provided the amount of potential calcium oxychloride that could form in each mixture. The TGA and LT-DSC data are also provided in this file. It should be noted the LT-DSC testing occurred in accordance with AASHTO T365 meaning that a 20% calcium chloride solution was used for determining calcium oxychloride formation. This is slightly different from the solution in which the specimens were stored; however, only minor changes in calcium oxychloride would be expected if the 30% solution were used for LT-DSC.