Abstract
The increase of active mineral admixtures consumption in contemporaneous cementiceous materials has stablished revision of some test methods. In the evaluation of blended cement durability, many accelerated tests of large application in portland cements become unvalid, because they don't allow to value the improvements produced by pozzolan materials. Koch-Steinegger Method appears as the most appropiate to evaluate sulfate resistance of cement with active mineral admixtures. In this paper are presented the results obtained with this test in the evaluation of an ordinary portland cement (CPN) and one resisting sulfates (CPARS), with low calcium fly ash addition. Fly ash is incorporated with three fineness (280, 420 and 480 m 2 /Kg Blaine). The results show that this addition improves sulfate resistance of CPN and in minor way of ARS cement. Fly ash influences evolution of mechanical strength in water and chemical resistance at first ages.
Highlights
The use of active mineral admixtures in concrete elaboration has suffered an important increase in the last years, because of different necessities in modern wold
Estas acciones se ven afectadas por variables propias de la ceniza volante y por causas exógenas a ella
The better sulfate resistance that present cements with fly ash must be attributed to three main reasons: a) Relative decrease of C^A in bleded cement; b) Pore size refinement of large capilars of cementiceous matrix by pozzolanic reaction product; c) Decrease of CH in cement paste (3)
Summary
The use of active mineral admixtures in concrete elaboration has suffered an important increase in the last years, because of different necessities in modern wold. The better sulfate resistance that present cements with fly ash must be attributed to three main reasons: a) Relative decrease of C^A in bleded cement; b) Pore size refinement of large capilars of cementiceous matrix by pozzolanic reaction product; c) Decrease of CH in cement paste (3). This actions are affected by variables of fly ash (fineness, reactivity, mineralogical composition) and extern reasons (cement composition, water/cement ratio, curing, percentage of replacement). For this reason it was studied Koch-Steinegger Method (5), which according to Calleja (6) appears like one of the most appropiate for that determination
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
