Durability Of Nano Modified Fly Ash Concrete To External Sulfate Attack Under Different Environmental Conditions
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Author | : Md. Mahbubur Rahman |
Publisher | : |
Total Pages | : 0 |
Release | : 2014 |
Genre | : |
ISBN | : |
There are still research gaps regarding the effects of key parameters such as water-to-cementitious materials ratio (w/cm), type of binder and pore structure characteristics on the response of concrete to special forms of sulfate attack: physical salt attack (PSA) and thaumasite sulfate attack (TSA). Hence, this study aims at developing an innovative type of concrete: nano-modified fly ash concrete, incorporating various dosages of nano-silica (NS) or nano-alumina (NA) and fly ash, and explores its efficiency in resisting various forms of sulfate attack.
Author | : Anis Abayou |
Publisher | : |
Total Pages | : 0 |
Release | : 2019 |
Genre | : |
ISBN | : |
Under lower temperatures, the hydration process of cement slows down significantly, and it completely stops when the temperature goes below 0°C. This hinders strength development and durability of concrete. The current practices for overcoming these challenges involve methods such as heating concrete ingredients and surroundings to provide favorable curing conditions for concrete. However, these practices are associated with significant costs and adverse environmental effects due to the requirements of enclosure materials, highly-skilled manpower for quality control, and considerable consumption of energy and significant amounts of greenhouse gas emissions. Therefore, Phase I of this thesis focused on developing nano-modified concrete mixtures comprising cold weather admixture systems CWAS which were mixed, placed and cured at cyclic temperatures (-5 /5°C) targeting applications in early fall and late spring periods. This phase followed the design of experiments (DOEs) modeling approach to test 15 concrete mixtures. Three parameters were considered in the model: incorporation of fly ash (up to 25%) and nano-silica (up to 4%) as well as combination of two types of antifreeze admixtures (calcium nitrate and nitrite). The mixtures were assessed based on setting time (placement), compressive strengths (hardened properties) and absorption (infiltration of fluids). Moreover, microstructure analysis tests were conducted to characterize the microstructural features. The results showed that nano-silica, even with the inclusion of fly ash, significantly enhanced the overall performance and development of microstructure of concrete mixed, cast, and cured at cyclic freezing/low temperatures. Phase II of this thesis targeted developing durable repair mixtures. The experimental program in this phase was composed of setting time, compressive strength, fluid absorption, bond strength, surface scaling, restrained shrinkage as well as mercury intrusion porosimetry tests. Seven mixtures incorporation of fly ash (up to 25%) and nano-silica (up to 4%) as well as CWAS were selected to evaluate their potential use as cold weather repair materials for concrete infrastructure targeting late fall and early spring periods. The overall results of this phase showed that nano-modified concrete mixtures achieved a balance between early- and late-age properties and high compatibility with substrate concrete, thus a promising potential for their use as repair mixtures in cold regions.
Author | : James T. Dikeou |
Publisher | : |
Total Pages | : 28 |
Release | : 1975 |
Genre | : Concrete |
ISBN | : |
Author | : Abla M. Zayed |
Publisher | : |
Total Pages | : 130 |
Release | : 1998 |
Genre | : Concrete |
ISBN | : |
Author | : A. Rasheeduzzafar |
Publisher | : |
Total Pages | : 11 |
Release | : 1986 |
Genre | : Cement Replacement |
ISBN | : |
The low durability of concrete construction in the Middle East caused by corrosion of reinforcement, sulfate attack, environmental cracking, and aggregate-cement reactivity necessitates that mix design techniques be formulated to yield dense and impervious concrete with as little heat of hydration as possible; it should also have enhanced resistance to salt attack and possible cement-aggregate reactivity. These objectives present fly ash as a potentially useful admixture from the standpoint of improving the durability of concrete construction in the aggressive service environment of the Gulf seaboard.
Author | : John L. Provis |
Publisher | : Springer Science & Business Media |
Total Pages | : 396 |
Release | : 2013-11-19 |
Genre | : Technology & Engineering |
ISBN | : 9400776721 |
This is a State of the Art Report resulting from the work of RILEM Technical Committee 224-AAM in the period 2007-2013. The Report summarises research to date in the area of alkali-activated binders and concretes, with a particular focus on the following areas: binder design and characterisation, durability testing, commercialisation, standardisation, and providing a historical context for this rapidly-growing research field.
Author | : J. Marchand |
Publisher | : CRC Press |
Total Pages | : 230 |
Release | : 2001-10-11 |
Genre | : Technology & Engineering |
ISBN | : 0203301625 |
Sulfate Attack on Concrete provides a comprehensive reference to this important subject. It covers: a short history of concrete deterioration due to sulfate attack, the origin of sulfates in concrete, the importance of appropriate concrete processing, forms and physical-chemical mechanisms of concrete deterioration due to sulfates, preventative mea
Author | : Kurt F. von Fay |
Publisher | : |
Total Pages | : 68 |
Release | : 1995 |
Genre | : Concrete |
ISBN | : |
Author | : Craig Toth |
Publisher | : |
Total Pages | : 214 |
Release | : 1998 |
Genre | : Concrete |
ISBN | : |
Author | : Achintya Kr Chattopadhyay |
Publisher | : LAP Lambert Academic Publishing |
Total Pages | : 124 |
Release | : 2012-03 |
Genre | : |
ISBN | : 9783848418343 |
Fly-ash has become an important raw material for preparation of sustainable concrete. Several investigations have proved fly ash concrete to be superior than ordinary concrete, in ambient temperature, in terms of strength as well as on durability. Performances of fly ash concrete in different aggressive environment, though, are yet to be investigated. Present experimental study has been made to see the performances of such concrete at fire conditions. A newer approach of mix design of concrete has been adopted here by substituting a part of cement by fly ash weighing twice that of cement, without addition of any chemical admixture. This has made it unique from earlier works done with equal fly ash substitution for cement replaced. The book has been prepared with a brief introduction, brief description of rheology of fly ash concrete, review of literatures available on behavior of concrete at high temperatures, experimental programme, results, discussion along with a concluding remarks. The book will be helpful for the students and researchers working on properties of concrete. As well as it will help graduate students and professionals working with fly ash concrete in construction.