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متابعة

As compared to ordinary portland cement, high alumina cement has:-

a) higher initial setting time but lower final setting timeb) lower initial setting time but higher final setting timec) higher initial and final setting timesd) lower initial and final setting times

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تم إضافة السؤال من قبل Mohamed Galal Hussein Ahmed Mohamed , Technical Mnager , Fast Building Contracting Co.
تاريخ النشر: 2015/02/25
محمد يونس
من قبل محمد يونس , مهندس مشرف , الشركة العامة للكهرباء

this  type the initial setting time  by BS915-2:1972 (1983) as between2 and6 hours typical values for this type are initial set at2,1/2  hours and final set at30 minutes therefore slow setting but final set follows the initial set more rapidly then is the case in Portland cement. i choice  b) lower initial setting time but higher final setting time

Mohamd Sltan
من قبل Mohamd Sltan , Volunteering, Business Development, Freelancing, Training , Running Own Business and Managing Community Association

Answer is A.  This type of cement is slow-setting. The initial setting time is2 to6 hours although final setting takes place approximately2 hours after initial set.

Alex Al Yazouri
من قبل Alex Al Yazouri , General Manager , Al Mushref Cooperative Society

High alumina cement has

b) lower initial setting time around 2 to 3 hours, but higher final setting time around 5 to 6 hours.

Mohamed Atia Abd elhady
من قبل Mohamed Atia Abd elhady , مهندس , دلتا مصر للمقاولات

b) lower initial setting time but higher final setting time

SUBHASHISH BHATTACHARYA
من قبل SUBHASHISH BHATTACHARYA , Asst. Manager-AutoCAD Drawing & Technical Documentation , Jindal Steel & Power Ltd.

b) Initial setting time is more than3 hours. Final setting time is about5 hours.

Therefore, it allows more time for mixing and placing operations. 

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