Variation of flexural strength of cement mortar attacked by sulfate ions

Abstract

a b s t r a c tUnder the environment of seawater, durability of concrete materials is one of the chief factors considered in the design of structures. The decrease of durability of structures is induced by the evolution of micro-damage due to the erosion of chlorine and sulfate ions, which is characterized by the reduction of modulus, strength, and toughness of the material. In this paper, the variation of the flexural strength of cement mortar under sulfate erosion is investigated. The results obtained in present work indicate that the erosion time, concentration of sulfate solution, and water-to-cement ratio will significantly affect the flexural strength.Crown

Study on the evolution of dynamic mechanics properties of cement mortar under sulfate attack

“…The first category is related to the performanc e of ettringite , which includes the phase structure of ettringite [6], formation mechanis m [7], growth characterist ics [8] and expansion theory [9,10]. The second is concerne d with the changes in the performanc e of concrete structure s under sulfate attack, which includes changes in compress ive strength, damage and durability of cement mortar [11][12][13][14][15][16][17][18]. Moreove r, the damage evolution, Young's modulus and Poisson's ratio was carefully evaluated through wave speed measuremen ts considering specimens of cement mortars with different water to cement ratios [19].…”

Evolution of surface hardness of concrete under sulfate attack

“…Chen et al studied damage evolution in cement mortar immersed in sodium sulfate solution for 425 days using ultrasonic techniques [13], and measured the growth properties of delayed ettringite and 0950-0618/$ -see front matter Ó 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.conbuildmat.2013.11.107 gypsum by virtue of XRD method [14]; Zhang et al tested the static and dynamic modulus of ettringite [15], and investigated the evolution of flexural strength of concrete due to sulfate attack [16]; Zhu et al studied the expansion strain of concrete immersed in sodium sulfate solution, and developed an increment model for expansion strain based on damage evolution [17].…”

Ultrasonic and impact spectroscopy monitoring on internal sulphate attack of cement-based materials

“…This delays the evolution of the strength and conditions its maximum value but a great expansion is not achieved because sulphate is consumed, no further strength decrease is produced along the time. On the contrary, for ESA the available sulphate is not limited and consequently a continuous decrease in mechanical properties is observed during the attacking process [29].…”