By Dale P Bentz, Chira F Ferraris, Kenneth A Snyder
A top practices consultant is built from a synthesis of contemporary examine on high-volume fly ash (HVFA) concrete combinations. those top practices should be utilized via the concrete building to accomplish wanted houses and to make sure the (high) functionality of HVFA concrete combos in perform. As such, the file considers all elements of HVFA concrete construction, from the characterization of the beginning fabrics, via blend proportioning and curing recommendations to accomplish wanted houses, to the in-place early-age and long term functionality of the concrete in its clean and hardened states. either mechanical and delivery houses are thought of intimately. viewpoint is tested according to a quick evaluate of present practices being hired nationally. every one topical part is concluded with a practice-based set of ideas for the layout and development neighborhood. The record is meant to function a worthy source to those groups, supplying either a examine precis and a advisor to functional steps that may be taken to accomplish the optimal functionality of those sustainable concrete combinations.
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Additional info for Best Practices Guide for High-Volume Fly Ash Concretes: Assuring Properties and Performance
El Hachem, and A. Loukili, Improvement of the early-age reactivity of fly ash and blast furnace slag cementitious systems using limestone filler, Mater. Struct. 44, 437-453 (2011). 61) J. P. Bentz, and A. Ardani, Enhancing high volume fly ash concretes using fine limestone powder, in Green Cements, ACI SP - , Minneapolis, MN (2013). 62) J. E. Oh, M. P. M. M. Monteiro, High pressure study of low compressibility tetracalcium aluminum carbonate hydrates 3CaO·Al2O3·CaCO3·11H2O, Cem. Concr. Res. 42, 105-110 (2012).
Concrete mixture proportions can be found in Table 3. In addition to reducing the rate of heat generation within a mass concrete element, the replacement of cement by fly ash will also change the thermophysical properties of the concrete mixture. This, along with the specific environmental boundary conditions, will in turn control how fast the generated heat can be dissipated from the mass concrete to its surroundings. While the specific heat capacity of HVFA mortars and concretes are similar to those of their OPC counterparts , both the density and the thermal conductivity of the HVFA composites are reduced due to the replacement of cement by the lower density fly ash.
29 (1), 33-41 (2007). 33) J. Tanesi, A. Ardani, R. Meininger, and N. Nicolaescu, Evaluation of High-Volume Fly Ash (HVFA) Mixtures (Paste and Mortar Components) Using a Dynamic Shear Rheometer (DSR) and Isothermal Calorimeter, Report No. PB2012-112546, National Technical Information Service, Springfield, VA, 2012. P. S. Department of Commerce, July 2002. 35) T. E. Baştopçu, Effect of curing on durability of fly ash concrete, in Durability of Concrete, Proceedings Sixth International Conference, ACI SP-212, American Concrete Institute, Farmington Hills, MI (2003) 353-368.
Best Practices Guide for High-Volume Fly Ash Concretes: Assuring Properties and Performance by Dale P Bentz, Chira F Ferraris, Kenneth A Snyder