Investigation on Mechanical Properties of Preplaced-Aggregate Concrete by Using Artificial Coarse Aggregate and Cement Paste Grouting
Ratni Nurwidayati
Civil Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat,
Banjarmasin, Indonesia
ratninurwidayat[at]ulm.ac.id
Abstract
In this paper, the effect of surface texture and composition of uniform coarse aggregate on preplaced-aggregate concrete is presented. The preplaced-aggregate concrete (PAC) or two-stage concrete is concrete produced by grouting the cement paste into formwork which is filled with coarse aggregate first. The grouting material fills the voids between aggregate. Preplaced aggregate concrete differs from conventional concrete that it is contains a higher percentage of coarse aggregate. Marbles are used as coarse artificial aggregate. Three kinds of the roughness of the surface of marbles are evaluated. The diameters of marbles are 10mm and 15mm. The data obtained has indicated that the rougher the surface of marbles, the higher the compressive strength of PAC, the optimum composition of coarse aggregate is 70% and 30% of diameter marbles of 10mm and 15mm respectively, the roughness of the surface of marbles does not influence the elastic modulus of PAC significantly and the concrete shrinkage is less the conventional concrete.
Keywords: Preplaced-aggregate concrete; grouting; cement paste; marble; shrinkage
Topic: International Symposium of Civil, Environmental, and Infrastructure Engineering