A study on the engineering properties for the high flowing concrete made of new slag ash

Environmental protection and sustainable development have been drawing global attention in the recent years so that how to effectively reuse by-products as viable green resourced materials is of importance. In the study a new pozzolanic material, also called new slag ash, containing blast furnace slag, basic oxygen furnace slag along with fly ash is developed and a part of cement in high flowing concrete is substituted by the new slag ash. To evaluate the engineering properties, uniformity and potential shrinkage of concretes, hardened properties such as compressive strength, splitting strength, elastic modulus, ultrasonic pulse velocity, and durability such as surface electrical resistivity, sulfate attack, as well as shrinkage are tested. As to the mixture design of high flowing concrete, the ratio of cement to new slag ash is 3:7. Also, the mixing water is 180 kg/m³, respectively. The design strength for both concretes is 210kg/cm². Once other properties testing will show satisfactory results as well, the slag ash will be applied into a variety of concrete structures in practical constructions, being a kind of green materials to reduce cement consumption and improve concrete performance. It is promising that the benefits in terms of energy conservation, carbon dioxide emission reduction, and concrete structure safety can be achieved.