Effects Of Temperature On The Development Of Low Permeability In Concretes
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Author | : Hamdi Celik Ozyildirim |
Publisher | : |
Total Pages | : 32 |
Release | : 1998 |
Genre | : Concrete |
ISBN | : |
This study evaluated the effects of temperature on the strength and permeability of concretes containing pozzolans (fly ash and silica fume) and slag. Two test programs were conducted. In the first, one control and five experimental mixtures containing silica fume, fly ash, or slag were evaluated. In the second, one control and three experimental mixtures containing fly ash or slag at a higher water-cementitious material ratio (W/CM) than used in the first program were evaluated. Concretes cured at higher temperatures had higher strengths up to 28 days but lower strengths at 1 year. Permeability decreased with time. Increasing early curing temperatures enabled the achievement of lower long-term permeability for 6 months and beyond at 28 days. Concretes containing a pozzolan or slag had a lower long-term permeability than the control. Adding a pozzolan was more effective in reducing permeability than reducing the W/CM. At cold temperatures, if the specified properties are not achieved, the contractor should change the mix design and/or provide insulating blankets and/or external heat to ensure the desired product.
Author | : Hamdi Celik Ozyildirim |
Publisher | : |
Total Pages | : 7 |
Release | : 1995 |
Genre | : Concrete |
ISBN | : |
Author | : William A. Olson |
Publisher | : |
Total Pages | : 350 |
Release | : 1994 |
Genre | : Concrete |
ISBN | : |
Author | : Tarun R. Naik |
Publisher | : ASTM International |
Total Pages | : 193 |
Release | : 1985 |
Genre | : Technology & Engineering |
ISBN | : 9780803104358 |
Author | : |
Publisher | : |
Total Pages | : 332 |
Release | : 1994 |
Genre | : Highway engineering |
ISBN | : |
Author | : Barzin Mobasher |
Publisher | : CRC Press |
Total Pages | : 473 |
Release | : 2011-09-20 |
Genre | : Technology & Engineering |
ISBN | : 1439806616 |
Among all building materials, concrete is the most commonly used-and there is a staggering demand for it. However, as we strive to build taller structures with improved seismic resistance or durable pavement with an indefinite service life, we require materials with better performance than the conventional materials used today. Considering the enor
Author | : K.L. Scrivener |
Publisher | : CRC Press |
Total Pages | : 474 |
Release | : 1997-04-17 |
Genre | : Architecture |
ISBN | : 9780419215707 |
Deterioration of cement-based materials is a continuing problem, as it results in the substantial shortening of the lives of conventional concrete structures. The main costs result from poor performance and the need for early repair. With more advanced applications, where very long service lives are essential, such as the storage of nuclear waste, an understanding of the degradation processes in order to predict long term performance is very important. this book forms the proceedings of the latest Symposia at the Materials Research Society Autumn meeting in Boston.
Author | : |
Publisher | : |
Total Pages | : 216 |
Release | : 2005 |
Genre | : State government publications |
ISBN | : |
Author | : PL. Owens |
Publisher | : |
Total Pages | : 16 |
Release | : 1985 |
Genre | : Alkali-aggregate reaction |
ISBN | : |
The effect of temperature rise and fall on concrete at early ages is rarely measured. Concrete cured at elevated temperature has reduced strength at later ages. The changes that occur in the hydration products have been measured in terms of the amount of calcium hydroxide [Ca(OH)2] present. Since permeability is, to some degree, a function of the water/cement ratio and strength, the measurement of permeability was necessary. Concrete is more permeable after it has undergone a temperature cycle similar to that found in practice. The use of Class F fly ash can effectively reduce the permeability of heat-affected concrete.
Author | : Joseph F. Lamond |
Publisher | : ASTM International |
Total Pages | : 661 |
Release | : 2006 |
Genre | : Technology & Engineering |
ISBN | : 0803133677 |