Mortars with nano-SiO2 and micro-SiO2 investigated by experimental design |
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| Affiliation: | 1. Materials Science and Engineering Graduate Program (PGMAT), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;2. Department of Civil Engineering (ECV), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;3. Department of Civil Engineering/CICECO, University of Aveiro (UA), 3810-193 Aveiro, Portugal;4. Department of Ceramics and Glass Engineering/CICECO, University of Aveiro (UA), 3810-193 Aveiro, Portugal;1. CSIR-Central Building Research Institute, India;2. University of the West of Scotland, UK;1. Department of Civil Engineering, CGC Technical Campus, Jhanjeri, Mohali, India;2. Department of Chemistry, Rayat Bahra University, Mohali, India;3. Department of Civil Engineering, MRSPTU, Bathinda, India;4. Department of Civil Engineering, National Institute of Technology, Kurukshetra, India;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China;2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, PR China;3. WUT-UC Berkeley Joint Laboratory on Concrete Science and Technology, Wuhan 430070, PR China |
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| Abstract: | This paper reports the effects of nanosilica (nS) and silica fume (SF) on rheology, spread on flow table, compressive strength, water absorption, apparent porosity, unrestrained shrinkage and weight loss of mortars up to 28 days. Samples with nS (0–7 wt.%), SF (0–20 wt.%) and water/binder ratio (0.35–0.59), were investigated through factorial design experiments. Nanosilica with 7 wt.% showed a faster formation of structures during the rheological measurements. The structure formation influences more yield stress than plastic viscosity and the yield stress relates well with the spread on table. Compressive strength, water absorption and apparent porosity showed a lack of fit of second order of the model for the range interval studied. In addition, the variation of the unrestrained shrinkage and weight loss of mortars do not follow a linear regression model. The maximum unrestrained shrinkage increased 80% for nS mortars (7 days) and 54% (28 days) when compared to SF mortars in the same periods. |
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