Use of DMDA method for production of heavyweight concrete

Abstract

Waste materials are defined as all unwanted substances from manufacturing processes, including mining, industry, agriculture and others. One of the most commonly used waste product in concrete manufacturing is Fly Ash (FA). Studies have shown that the content of Fly Ash increases the workability of concrete, being useful in production of Self-Consolidating Concretes (SCC). One of the designing methods involving high amounts of fly ash is based on the Densified Mixture Design Algorithm (DMDA). This article attempts to work out HWSCC manufacturing method using the DMDA method with the use of barite and magnetite aggregates. The study integrates six concrete mixes. Concrete strength was tested on 10x10x10 cm samples after 3,7 and 28 days. The rheological properties were tested with Slump Test to find out if the mixes exhibit self-consolidating properties. Concretes with magnetite aggregate exhibit higher strength than concretes with barite aggregate. The study has shown that the DMDA method, designed to produce durable, low-cement concrete may not be applicable in the case of crushed aggregates. The study has shown that the method allows to decrease the cement amount and re-place it with pozzolan waste product to acquire concretes with similar properties to the ones acquired using different methods.