Technology for Preparing and Thermal Treatment of High Strength Concretes
Title:
Technology for Preparing and Thermal Treatment of High Strength Concretes
Author:
Vladimir Corobceanu Razvan Giusca
Appeared in:
Journal of applied sciences
Paging:
Volume 6 (2006) nr. 5 pages 1033-1039
Year:
2006
Contents:
High strength concretes, without which initially stressed members and high-rise buildings are inconceivable today, can be obtained with great technology and economic efforts. From among and technical parameters contributing in meeting this desideration, the main ones refer to the quality and dosage of cement types and nature of aggregate surface, as well as the concrete preparing placing and subsequent curing. As in numerous situations the high strength concretes are used in creating precast members. In order to accelerate the hardening of this material, in most countries, worldwide, thermal procedures are being used. Besides the beneficial effect of intensifying the chemical reactions in the water-cement system "with immediate consequences for the hardening kinetics", temperature rise brings about major, destructive modifications in the hardened concrete structure. As a consequence, thermally treat concretes exhibit, in all cases, at 28 days` age and beyond it, strength and durability coefficients that are sensibly lower than in the concretes hardened under normal conditions. At the some time, even at normal temperatures the cement binding energy is insufficiently used and the affect is the more remarkable when the binder batching is higher. The authors propose a technology of high strength concrete preparing and thermal treating, which allows for the optimal use of the cement quantity introduced in the mixture, concomitantly with severely limiting the destructive effects on concrete structures, at high temperatures.
Publisher:
Asian Network for Scientific Information (provided by DOAJ)
Journal description