期刊
CEMENT AND CONCRETE RESEARCH
卷 88, 期 -, 页码 198-210出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.07.004
关键词
Alkali-activated cement (D); Fly ash (D); Metakaolin (D); Compressive strength (C); Durability (C)
Alkali-activated and cementitious mortars belonging to R1 >= 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. (C) 2016 Elsevier Ltd. All rights reserved.
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