اندازه گیری مقاومت فشاری بتن
متداول ترین و رایجترین روش تعیین سختی سطح از روش های تست بتن که به صورت غیر مخرب انجام می شود تست چکش اشمیت بوده که برای اندازه گیری مقاومت فشاری بتن می باشد. برای تعیین سختی سطح بتن، بتن مورد آزمایش با انرژی ضربه ای مشخص با روش استاندارد ضربه زده شده و بزرگی بازگشت این عمل اندازه گیری می شود.
در چکش اشمیت فنری مشخص باری را روی پیستون در سر آن وارد می سازد. در آغاز آزمایش چکش اشمیت میله یا پیستون آزاد سر چکش اشمیت بر روی سطح بتن قرار دارد سپس بدنه خارجی چکش اشمیت به سطح بتن فشار داده می شود تا فنر داخل دستگاه کشیده شود.
چفت دستگاه هنگامی که فنر کاملا کشیده میشود و چکش اشمیت به سمت سطح بتن حرکت می کند، آزاد می گردد. چکش اشمیت به سر پیستون ضربه وارد میکند وجرم همراه فنر بازگشت یافته و عقربه ای را با خود بر روی نواری مدرج حرکت می دهد تا از روی آن بتوان عدد بازگشت چکش اشمیت را قرائت نمود. عدد بازگشتی به سختی و جرم فنر بستگی داشته و از روی آن با تبدیلی خاص می توان سختی سطح را بدست آورد.
۴۳ دیدگاه. Leave new
تشکر ویژه دارم از آقای مهندس محمدپور بابت اطلاعات مفیدی که در اختیار بنده قرار دادند.
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