Effect of impact hot- dry weather conditions on the properties of high performance lightweight concrete
Joint Authors
Jumah, Nada H.
Khalil, Wasan Ismail
Ahmad, Hisham Khalid
Source
Engineering and Technology Journal
Issue
Vol. 36, Issue 3A (31 Mar. 2018), pp.262-273, 12 p.
Publisher
Publication Date
2018-03-31
Country of Publication
Iraq
No. of Pages
12
Main Subjects
Engineering & Technology Sciences (Multidisciplinary)
Abstract EN
The aim of this investigation is to produce high performance lightweight aggregate concrete in actual hot- dry weather conditions, and then study the combined effect of hot-dry weather conditions on the fresh properties of high performance lightweight aggregate concrete such as workability, initial and final setting time, measuring concrete temperature, and hardened concrete properties (compressive strength, splitting tensile strength and flexural strength, modulus of elasticity).
The experimental program including the use of fixed mix proportions and was carried out in a typical Iraqi summer days (under actual conditions) of different times during the day, where the mean maximum temperature in shadow in July and August usually is more than 44° C and relative humidity of about 24 %, the results were compared with the specimens prepared and casted in laboratory and others in shadow site.
The results indicate that as temperature rises, and relative humidity falls, the initial and final setting time were reduced, beside that actual drop in slump.
The results also show that rising placing temperatures more than allowable concrete temperature that recommended in ACI 305 does not, as a rule, lead to lower strengths.
The strength performance of concrete can remain unaffected by higher placing temperatures, or it can even improve over that at lower temperatures.
Using pre-soaked lightweight aggregates (pumice) as internal water reservoirs for producing this type of concrete under actual hot-dry weather condition played positive role in improvement of concrete properties by compensate the evaporation of water due to the rising temperature and decreasing relative humidity, and provide additional moisture in concrete for a more effective hydration of the cement.
American Psychological Association (APA)
Ahmad, Hisham Khalid& Khalil, Wasan Ismail& Jumah, Nada H.. 2018. Effect of impact hot- dry weather conditions on the properties of high performance lightweight concrete. Engineering and Technology Journal،Vol. 36, no. 3A, pp.262-273.
https://search.emarefa.net/detail/BIM-831154
Modern Language Association (MLA)
Ahmad, Hisham Khalid…[et al.]. Effect of impact hot- dry weather conditions on the properties of high performance lightweight concrete. Engineering and Technology Journal Vol. 36, no. 3A (2018), pp.262-273.
https://search.emarefa.net/detail/BIM-831154
American Medical Association (AMA)
Ahmad, Hisham Khalid& Khalil, Wasan Ismail& Jumah, Nada H.. Effect of impact hot- dry weather conditions on the properties of high performance lightweight concrete. Engineering and Technology Journal. 2018. Vol. 36, no. 3A, pp.262-273.
https://search.emarefa.net/detail/BIM-831154
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 272-273
Record ID
BIM-831154