چکیده مقاله
It has long been known that curing concrete during cold weather can result in an inferior product with substandard properties Curing also takes much longer, adding to job costs and extending the time before the concrete surface can be used Admixtures are those ingredients in concrete other than portland cement, water, and aggregates that are added to the mixture immediately before or during mixing An accelerating admixture is used to accelerate the rate of hydration setting and the strength development of concrete at an early age Calcium chloride CaCl2 is the chemical most commonly used as accelerating admixture, especially for nonreinforced concrete but it results in corrosion and lack of concrete durability; In order to solve these problems Aluminum hydroxide Al OH 3 and Aluminum Sulfate Al2 SO4 3 were used In this study, a total of 252 specimens in which different amounts of calcium chloride, aluminum hydroxide ,and Aluminum Sulfate were added to concrete were made The effect of calcium chloride and aluminum hydroxide and Aluminum Sulfate on setting time, compressive strength, hydration temperature and permeability was determined The specimens were experimented on in different days from 2 to 90 in order to measure strength As a conclusion Calcium chloride causes a shorter setting time and lowers costs in comparison to Aluminum hydroxide and Aluminum Sulfate On the contrary Aluminum hydroxide and Aluminum Sulfate have no effects on corrosion and they reduce the weight of concrete, prevent alkali reactions of aggregates, and increase durability
کلیدواژهها
نویسندگان
SH Rahimi
Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran
sj mortazavi
SH Rahimi Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Irana golchinas ghods
a golchin
SH Rahimi Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iransj mortazavias ghods
as ghods
SH Rahimi Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iransj mortazavia golchin
شیوه ارجاع
Rahimi, SH and mortazavi, sj and golchin, a and ghods, as,1391,An Optimal Accelerator Used In Concrete,9th International Congress on Civil Engineering,Isfahan
ارائهشده در
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