Durability of Pervious Concrete with Fly Ash Subjected to Freeze-thaw and Salt Exposure, in a Simulated Field Environment PDF Download
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Author: Ian Anderson
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Book Description
Therefore, the specific objectives of this study were to: (1) determine the effects of deicing salts on pervious concrete, using a modified and more field representative testing procedure that involves slow freeze-thaw cycling in drained condition, and (2) determine the effects of cement replacement with increasing amounts of fly ash on the freeze-thaw, durability of pervious concrete.
Author: Ian Anderson
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Book Description
Therefore, the specific objectives of this study were to: (1) determine the effects of deicing salts on pervious concrete, using a modified and more field representative testing procedure that involves slow freeze-thaw cycling in drained condition, and (2) determine the effects of cement replacement with increasing amounts of fly ash on the freeze-thaw, durability of pervious concrete.
Author: Chengsheng Ouyang
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 70
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Book Description
The freeze-thaw resistance of concretes was studied. Nine concrete mixes, made with five cements and cement-Class C fly ash combinations, were exposed to freeze-thaw cycling following 110 to 222 days of moist curing. Prior to the freeze-thaw cycling, the specimens were examined by a low-vacuum scanning electron microscope (SEN) for their microstructure. The influcence of a wet/dry treatment was also studied. Infilling of ettringite in entrained air voids was observed in the concretes tested. The extent of the infilling depends on the period of moist curing as well as the wet/dry treatment. The concretes with 15% Class C fly ash replacement show more infilling in their air voids. It was found that the influence of the infilling on the freeze-thaw durability relates to the air spacing factor. The greater the spacing factor, the more expansion under the freeze-thaw cycling. The infilling seems to decrease effective air content and to increase effective spacing factor. The infilling also implies that the filled air voids are water-accessible. These might lead to concrete more vulnerable to the freeze-thaw attack. By combining the above results with field observations, one may conclude that the freeze-thaw damage is a factor related to premature deterioration of PCC pavements in Iowa.
Author: Scott Michael Schlorholtz
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 62
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Book Description
The major objective of this research project is to investigate how fly ash influences the chemical durability of portland cement based materials. The testing program is evaluating how Iowa fly ashes influence the sulfate durability of portland cement-fly ash pastes, mortars, and concretes. Also, alkali-reactivity studies are being conducted on mortar bar specimens prepared in accordance with ASTM C311. Preliminary sulfate test results, based only on mortar bar studies, indicate that only the very high-calcium fly ash (29 percent CaO, by weight) consistently reduced the durabiity of test specimens exposed to a solution containing 5 percent sodium sulfate. The remaining four fly ashes that were used in the study showed negligible to dramatic increases in sulfate resistance. Concrete specimens were only beginning to respond to the sulfate solutions after about one year of exposure; and hence, considerably more time will be needed to assess their performance. Preliminary results from the alkali-reactivity tests have indicated that the Oreopolis aggregate is not sensitive to alkali attack. However, some of the test results have indicated that the testing procedure may be prone to delayed expansion due to the presence of periclase (MgO) in the Class C fly ashes. Research is being planned to: (1) verify if the periclase is influencing test results; and (2) estimating the magnitude of the potential error.
Author: Ken Isenberger
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 42
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Book Description
Effect of fly ash class, source and amount on the compressive strength and freeze-thaw durability of fly ash concrete.
Author:
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 52
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Book Description
Author: Sandeep Mahajan (Graduate student)
Publisher:
ISBN:
Category : Fly ash
Languages : en
Pages : 0
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Book Description
Author: Donald J. Janssen
Publisher: RILEM Publications
ISBN: 9782912143310
Category : Concrete
Languages : en
Pages : 318
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Book Description
Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 39
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Book Description
Author: Thomas Duane Larson
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 416
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Book Description
Author: Carson B. DeMille
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 192
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Book Description
A comparison of in situ modulus values, core modulus values, and core compressive strengths associated with clogged locations and unclogged locations in the field indicated no significant differences in structural properties in the clogged and unclogged locations.
