concrete
Lecture:Elham Vafaee Noughabi
Autumn 90
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In the slump test,a specimen of the mix is placed in a mold shaped as the frustum of a cone,12 in high,with 8 in diameter base and 4 in diameter top(ASTM specification C143)
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In the slump test,a specimen of the mix is placed in a mold shaped as the frustum of a cone,12 in high,with 8 in diameter base and 4 in diameter top(ASTM specification C143)
در آزمایش اسلامپ ،نمونه ای از ترکیب در یک قالب به شکل مخروط ناقص با ارتفاع 12،قطر قاعده ی 8اینچ،قطر دهانه بالایی 4اینچ ریخته می شود.
)ASTM،C143(مشخصات
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Frustum of a cone
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When the mold is removed ,the change in height of the specimen is measured.when the test is made in accordance with the ASTM specification,the change in height maybe taken as the slump.
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When the mold is removed ,the change in height of the specimen is measured.when the test is made in accordance with the ASTM specification,the change in height maybe taken as the slump.
وقتی قالب برداشته می شود،تغییر در ارتفاع نمونه اندازه گیری می شود،در صورتی که آزمایش طبق مشخصات ASTM
انجام شود،تغییر در ارتفاع را اسلامپ می نامند.
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Slump test
The mold is remove.
The change in height is measure.
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(As measured by this test,slump decreases as temperature increases;thus the temperature of the mix at time of test should be specified,to avoid erroneous conclusions)
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(As measured by this test,slump decreases as temperature increases;thus the temperature of the mix at time of test should be specified,to avoid erroneous conclusions)
(طبق اندازه گیری های این آزمایش،با افزایش دما،اسلامپ کاهش می یابد.بنابراین دمای مخلوط در زمان آزمایش باید معین شود تا از نتایج نادرست جلوگیری شود.)
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Durability is another important property of concrete.Concrete should be capable of withstanding the weathering,chemical action,and wear to which it will be subjected in service.
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Durability is another important property of concrete.Concrete should be capable of withstanding the weathering,chemical action,and wear to which it will be subjected in service.
دیگر خصوصیت مهم بتن،دوام و ماندگاری است.
بتن باید در برابر هوازدگی،فعالیت های شیمیایی و فرسایشی که در طول عمر مفید خود در معرض آن قرار می گیرد مقاوم باشد.
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Much of the weather damage sustained by concrete is attributable to freezing and thawing cycles.
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Much of the weather damage sustained by concrete is attributable to freezing and thawing cycles.
قسمت عمده آسیب های ناشی از آب و هوا بر بتن را می توان مربوط به چرخه یخ بستن و ذوب شدن آن دانست.
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Resistance of concrete to such damage can be improved by increasing the watertightness,
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Resistance of concrete to such damage can be improved by increasing the watertightness,
مقاومت بتن در برابر چنین آسیب هایی را می توان با بهبود خاصیت ضد آبی ترفیع بخشید.
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,by entraining 2 to 6 % air.
By using an air entraining agent,or by applying a protective coating to the surface.
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,by entraining 2 to 6 % air.
By using an air entraining agent,or by applying a protective coating to the surface.
این عمل با افزودن عامل هوازا و وارد کردن 2تا 6درصد هوا به بتن یا با استفاده از یک روکش محافظ بر سطح بتن صورت می گیرد.
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The end
Thanks for your attention.
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