M-PSA 混凝土毛细吸水及力学性能研究.

Transmission of moisture in capillaries is a main reason for deterioration of concrete. A new-modified PSA (M-PSA), made from Fenton paper mill sludge through high temperature heating and cooling before mixed stearic aci, was modified by ball-milling. The M-PSA replacing the ordinary portland cement in varying proportions were used to made up concrete together with aggregate, and then the performances of capillay water absorption and mechanism of the concrete were tested. Compositions and hydration mechanism of the M-PSA and the concrete were analyzed by XRD, SEM/EDS and FTIR. The results show that when the content of M-PSA reaching up to 4％, there are the more C-S-H and the better interface performance in concrete due to the active ingredients of Al and Si, calcium ferrite and calcium ferroalumnates from the M-PSA, at the same time the lower water adsorption since the introducing of hydrophobic group then CON. Early compressive strengths of the concrete are increased by replacing M-PSA, which have no effect on the long-term compressive strength, in spite of the slight decrease of splitting-tensile strength. M-PSA can act as a concrete admixture by adopting isometric substitute of Ordinary Portland Cement to improve the water absorption characteristics of concrete，thereby applying to engineering with high waterproof or durability requirement. [ABSTRACT FROM AUTHOR]