Metakaolin and fly ash alkali-activated mortars compared with cementitious mortars at the same strength class |
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| Affiliation: | 1. School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia;2. Structural Material Niche Area, School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia;3. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;1. Department of Civil Engineering, University of Nebraska-Lincoln, 362 Whittier Research Center, Lincoln, NE 68583-0856, United States;2. Department of Civil Engineering, University of Nebraska-Lincoln, 203D Peter Kiewit Institute, Omaha, NE 68182, United States;3. Department of Civil Engineering, University of Nebraska-Lincoln, 362N Whittier Research Center, Lincoln, NE 68583-0856, United States;1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China;2. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, China;3. Zhejiang Research Institute, China University of Geosciences, Hangzhou 311305, China;1. Materials Science Institute of Madrid (ICMM), CSIC, Sor Juana Inés de la Cruz 3, 28049, Cantoblanco, Madrid, Spain;2. Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, UK;3. National Centre for Metallurgical Research (CENIM), CSIC, Ave. Gregorio del Amo 8, 28040 Madrid, Spain |
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| Abstract: | Alkali-activated and cementitious mortars belonging to R1 ≥ 10 MPa, R2 ≥ 15 MPa and R3 ≥ 25 MPa strength classes were tested and compared in terms of workability, dynamic modulus of elasticity, porosimetry, and water vapor permeability. Capillary water absorption, drying shrinkage, resistance to sulfate attack, and corrosion behavior of embedded bare and galvanized reinforcements were also investigated.In alkali-activated mortars, drying shrinkage is higher than that of cementitious mortars but restrained shrinkage is lower due to lower modulus of elasticity. Pore dimensions affect water vapor permeability, more pronounced in alkali-activated mortars, and capillary water absorption, much lower in fly ash ones. The high alkalinity of fly ash and metakaolin mortars delayed the achievement of the passive state in particular for the galvanized reinforcements but after 1 month of curing they reached the same corrosion rates of those embedded in cementitious mortars. |
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