Analysis of Durability of Advanced Cementitious Materials for Rigid Pavement211 Construction in California

摘要

Caltrans specifications for the construction of rigid pavements require rapid211u001esetting, high early strength, superior workability concrete with a desired 30+ 211u001eyear service life. These strict specifications provide the motivations for the 211u001einvestigation of advanced cementitious materials for pavement construction. The 211u001ecementitious materials under consideration by Caltrans may be classified into 211u001efour categories: Portland cements and blends, calcium aluminate cements and 211u001eblends, calcium sulfoaluminate cements, and fly ash-based cements. To achieve the 211u001edesired 30+ year design life, it is essential to select materials that are 211u001eexpected to exhibit long-term durability. Because most of the cementitious 211u001ematerials under consideration have not been extensively used for pavement 211u001econstruction in the United States, it is essential to characterize the long-term 211u001edurability of each material. This report provides general information concerning 211u001ethe deleterious reactions that may damage concrete pavements in California. The 211u001ereactions addressed in this report are sulfate attack, aggregate reactions, 211u001ecorrosion of reinforcing steel, and freeze-thaw action. Specifically, the 211u001eexpected performance of Portland cements and blends, calcium aluminate cements 211u001eand blends, calcium sulfoaluminate cements, and fly ash-based cements are 211u001eexamined with regard to each of the deleterious reactions listed. Additional 211u001econsideration is given to any deterioration mechanism that is particular to any 211u001eof these cement types. Finally, the recommended test program for assessing 211u001epotential long-term durability with respect to sulfate attack is described.