Turhan Bilir

Use of granulated blast-furnace slag in concrete as fine aggregate

Experimental studies were performed on the use of non-ground-granulated blast-furnace slag as an aggregate in concrete. Using industrial by-products can help reduce greenhouse gas emission, and can be more economical than normal Portland cement concrete. While grinding the slag puts an additional burden of cost into production, using them as a partial fine aggregate does not increase the cost. This paper performed studies on compressive and flexural strength, water absorption, unit weight, durability of high temperatures, freezing and thawing, and rapid chloride permeability tests establish that non-ground-granulated blast-furnace slag can used as a fine aggregate in concrete.

Prediction of restrained shrinkage crack widths of slag mortar composites by Takagi and Sugeno ANFIS models

Abstract Shrinkage is an important parameter affecting crack development of mortars and concrete. With the occurrence of shrinkage cracks, the concrete starts to be exposed to the corrosion which significantly decreases the durability of concrete or mortars. In this study, the results of free shrinkage tests determining the length changes and ring test determination of the restrained drying shrinkage cracks are used for predicting the crack widths of granulated blast furnace slag fine aggregate mortars using adaptive-network-based fuzzy inference system (ANFIS). Subsequently, replacement ratios, drying time and free shrinkage length changes are used as inputs and crack width as output in order to predict the shrinkage cracking of these mortar types. The experimental test and the prediction results from the ANFIS model are compared with each other. It is clear that ANFIS can be employed directly in the prediction or discussion of the drying shrinkage cracks.