MIX PROPORTIONING OF SELF COMPACTING CONCRETES BASED ON COMPRESSIBLE PACKING MODEL
Decrease in the porosity of concrete enhances the performance in fresh and hardened states.This method works more easily in case of Self Compacting Concrete (SCC) which basically utilizes more fines than normal concrete.The question now arises how to effectively modify this pore structure.The answer to this can be a right combination of the different sizes of the granular skeleton (aggregate) to optimize in such a way to yield concrete with good strength and durability.The increased use of finer material in SCC mixes by increasing the use of various mineral admixtures or more finer aggregates itself as a replacement for coarse aggregate or as addition is being followed.One way of arriving the optimum sizes and proportions of coarse/fine aggregate for preparing a dense concrete is the Compressible Packing Model (CPM) concept.Investigations for establishing a rational mix-design method and self-compactability testing methods have been carried out from the viewpoint of making self-compacting concrete a standard concrete.In the present work M20 grade SCC mix was developed using Compressible Packing Model concept for fiber based SCC to arrive at the proportions of aggregate.A detailed mix design procedure developed using CPM method has been explained in this paper with the fresh and hardened properties obtained for the above developed mixes.It was noted that the CPM based optimization of selection of the aggregates considers important parameters like wall effect and loosening effect which are important in deciding the aggregate portion of SCC.Also because of less porosity the required paste content also decreases thus economizing the concrete.
Self-Compacting concrete Granular skeleton Wall effect Container effect Compressible packing model
K.L.RADHIKA P.RATHISH KUMAR
Department of Civil Engineering, OU College of Engineering, AP, India Department of Civil Engineering, NIT Warangal, AP, India
国际会议
厦门
英文
80-90
2014-06-05（万方平台首次上网日期，不代表论文的发表时间）