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A special modifier for pervious concrete was developed aimed at the problem of impervious road surface, which can easily lead to urban waterlogging when the rainfall is large. Different modifiers were selected to compare their influences on the strength and permeability coefficient of cement pervious concrete. The test results showed that the self-made modifier can enhance the strength and permeability coefficient of pervious concrete, and the increment of permeability coefficient is the largest when the content is 5%. What's more, compared with the commercial modifier, the strength and permeability coefficient of pervious concrete increased more obviously when the self-made modifier was used. The self-made modifier could increase the strength of pervious concrete by 20.5% and the permeability coefficient by more than 17.6%. [ABSTRACT FROM AUTHOR]

In order to meet performance requirements for large-volume UHPC in the steel-concrete joint section of the Panggong Bridge in Xiangyang, the proportion of each component of the cementitious material system is optimized by the compact packing theory, low hydration heat and low shrinkage UHPC is prepared by adding steel slag powder and composite expansion agent. The results show that UHPC with good working performance can be prepared by using high content of mineral admixture, the adiabatic temperature rise is only 59.7 &#176C, the drying shrinkage rate of 180 d is only 280-10-6, all other indicators can meet the project requirements. The hydration heat and drying shrinkage can be reduced by adding steel slag powder. [ABSTRACT FROM AUTHOR]