10.18720/MCE.83.17
Dvorkin, Leonid
Leonid
Dvorkin
National University of Water Environmental Engineering
Method of calculating the optimal sand content in normal-weight concrete
Санкт-Петербургский политехнический университет Петра Великого
2018
research paper
concrete mixture
optimal sand content
viscosity
water demand
water separation
the volume of the entrained air
calculation
бетонная смесь
оптимальное содержание песка
вязкость
водопотребность
водоотделение
объем вовлеченного воздуха
расчет
2018
In the practice of proportioning concrete compositions, the optimum sand content in a mixture of aggregates is usually found empirically. The disadvantage of this approach is the considerable complexity and duration of the required tests. The aim of the work is to develop a calculation methodology for finding the content of sand in the normal-weight concrete, taking into account the optimality criteria given. Based on the well-known theoretical concepts, the design equations are substantiated for finding the content of sand in a mixture of concrete aggregates, which ensures the lowest viscosity of the concrete mixture and prevent water separation. Using the experimental-statistical model, a method is also proposed for finding the sand content in concrete that provides the required volume of entrained air. The proposed calculation methods are confirmed experimentally.