Gypsum Seting Time
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[pic]
Faculty of engineering
Civil engineering department
ENCS 314
Building material lab
Experiment No. 15&16
"Determination of water content used to prepare gypsum samples and the determination of the final setting for gypsum"
Prepared by: Rasha Abed 1031107
Partners:
Hazem No 'man 1060155
Mohammed Hashlamoun 1060173
Ehab Alawi 1051449
Instructor: Ms. Randa Al- Asmar
Date of experiment: 25-03-2008
Date of submitting: 01-04-2008
"Determination of water content used to prepare standardized gypsum samples and the determination of the final setting for gypsum"
Introduction:
In civil engineering, gypsum plays a role as a building material that contributes to many products such as cement and plaster. In this experiment, we investigated some properties considering hardening of gypsum, such as the standard water content and setting time.
Aim of the experiment:
- Determination of the proper water content to prepare gypsum paste samples
- Determination of the final setting time for gypsum paste.
Theory:
Standard water content: amount of water added to gypsum to form a paste that 'd allow the pointer of Vicat 's apparatus to descend to a point (30-32) mm above the base of the mold.
Setting time of Gypsum: the amount of time that passes from the moment of adding water to the gypsum paste (would be already determined); to the moment that Vicat 's needle would descend to reach 3 mm above the base of the mold.
Apparatus:
• Determination of the water content:
- Vicat apparatus - Balance - Metal tray - Graduated cylinder
• Determination of the setting time for gypsum:
- Vicat 's apparatus (the pointer is replaced by Vicat 's needle of 10 mm diameter. - Stop watch
Procedure:
• Determination of the water content:
1. A 200 gm sample of gypsum is prepared, and put over a plate, to be added
[pic]
Faculty of engineering
Civil engineering department
ENCS 314
Building material lab
Experiment No. 15&16
"Determination of water content used to prepare gypsum samples and the determination of the final setting for gypsum"
Prepared by: Rasha Abed 1031107
Partners:
Hazem No 'man 1060155
Mohammed Hashlamoun 1060173
Ehab Alawi 1051449
Instructor: Ms. Randa Al- Asmar
Date of experiment: 25-03-2008
Date of submitting: 01-04-2008
"Determination of water content used to prepare standardized gypsum samples and the determination of the final setting for gypsum"
Introduction:
In civil engineering, gypsum plays a role as a building material that contributes to many products such as cement and plaster. In this experiment, we investigated some properties considering hardening of gypsum, such as the standard water content and setting time.
Aim of the experiment:
- Determination of the proper water content to prepare gypsum paste samples
- Determination of the final setting time for gypsum paste.
Theory:
Standard water content: amount of water added to gypsum to form a paste that 'd allow the pointer of Vicat 's apparatus to descend to a point (30-32) mm above the base of the mold.
Setting time of Gypsum: the amount of time that passes from the moment of adding water to the gypsum paste (would be already determined); to the moment that Vicat 's needle would descend to reach 3 mm above the base of the mold.
Apparatus:
• Determination of the water content:
- Vicat apparatus - Balance - Metal tray - Graduated cylinder
• Determination of the setting time for gypsum:
- Vicat 's apparatus (the pointer is replaced by Vicat 's needle of 10 mm diameter. - Stop watch
Procedure:
• Determination of the water content:
1. A 200 gm sample of gypsum is prepared, and put over a plate, to be added
References: [1]: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V2G-4BRRGD8-2&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=4e71cbde7aba9b4d1338fea79920ab39 [2]: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-40GRJTP-7&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=5c7ed60e8eed63f2ad9c9a5412b00080 [3]: http://www.apitco.org/Profiles/Gypsum%20based%20building%20materials.pdf