Application of X-Ray Computed Tomography to Characterize the Pore Structure of One-Part Alkali-Activated Slag/Fly Ash Mortars Containing Waste Ceramic Aggregates
One-part alkali-activated slag/fly ash mortars bring the advantages of both eco-friendly construction material and acceptable mechanical properties.One-part or just add water alkali-activated binders are an approach to reduce the negative aspects of using alkali solution during the preparation of the traditional two-part alkali activated binders.Despite the advantages of this material, the efficiency of alkali-activated slag/fly ash mortars is significantly governed by the pore distribution and size.One of the main aims of this paper was utilizing ceramic waste as aggregate in alkali-activated blast-furnace slag/fly ash binders.Since the effects of ceramic aggregates on the pore structure and strength could be critical on the strength due to their irregular shapes and providing hard casting conditions, therefore, the characterizations of pore structure and tortuosity were determined by using X-ray computed tomography (CT) technique.In this investigation, ground granulated blast-furnace slag (45% binder in mass) and fly ash (45% binder in mass) were activated by using an anhydrous sodium metasilicate (10% binder in mass).Additionally, porcelain ceramic wastes were employed as recycled aggregates.Moreover, a comparative study was conducted by using two other mix compositions, which were prepared by incorporating normal aggregates and slag as the only used precursor in the mix composition to clarify the effects of ceramic wastes and fly ash on the porosity and strength, respectively.Promisingly, this study presented that replacing normal aggregates with ceramic waste aggregates had no significant influence on the compressive strength loss (around 5%).Moreover, μCT scans demonstrated that this technique has high capacity in characterization of three dimensional pore distributions and sizes.
Pore size pore distribution strength ceramic waste aggregates 2D and 3D images CT scanning
Mastali M. Korat L. Abdollahnejad Z. Kinnunen P. Ducman V. Illikainen M.
Fibre and Particle Engineering, Faculty of Technology, Univ.of Oulu, P.O.Box 4300, 90014 Oulu, Finla National Building and Civil Engineering Institute, Dimi(c)eva ulica 12, SI-1000 Ljubljana, Slovenia
国际会议
福州
英文
179-186
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）