2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Amgad Hussein, Memorial University of Newfoundland
Dr. Stephen Bruneau, Memorial University of Newfoundland
The current study was conducted to evaluate the effect of different nano materials on the performance of high performance modified normal density concrete (HPMNDC) with 50% replacement of coarse aggregate by lightweight aggregate. The study was targeted to providing enhancement to the mechanical properties and abrasion resistance of the HPMNDC by using advanced materials and optimizing the mixture proportions. For this purpose, two types of Nano-materials, colloidal silica (CS) and titanium dioxide (TD) were used in nine different concrete mixtures. The ratios of cement replacement with CS were 1%, 3%, 5%, and 7%. For the TD, the replacement ratios were 0.6%, 0.8%, 1%, and 1.2%. The mixtures were made with 550 kg/m3 of cement and 0.30 water to binder ratio. The mixtures also included the usage of metakaolin (MK) and fly ash (FA) as partial cement replacement materials, both at 10%, along with inclusion of basalt fibers (BF) at 0.1%. The concrete specimen were tested using destructive and non-destructive methods to evaluate their performance. The tests results revealed that, the incorporation of both types of materials, led to some enhancement of the HPMNDC abrasion resistance and mechanical properties. The preliminary results indicated that the optimum content of CS in the HPMNDC mixtures turned to be 3%, while the TD optimum content was 1%. Also, the study provides some empirical relationships between abrasion resistance and different test parameters. The experimental results and the proposed equations were in reasonable agreement.