Kelly Ball Test of Concrete
कंक्रीट की सुकार्यता के लिए परिक्षण
[ASTM C-360-92 ]
Kelly Ball Test कंक्रीट की सुकार्यता कंक्रीट की सबसे आवश्यक और जटिल संपत्ति है। एक उत्कृष्ट काम करने योग्य कंक्रीट बनाने में कई कारक शामिल होते हैं और कंक्रीट की सुकार्यता का पता लगाना सिविल इंजीनियरों के लिए एक बहुत बड़ा काम है जिसमें लंबी गणना शामिल होती है। इसे खोजने के लिए, शोधकर्ताओं ने कुछ आवश्यक परीक्षण खोजे जो कंक्रीट की सुकार्यता पर सटीक परिणाम देते हैं Kelly Ball Test इसी मैं से एक है |
Average Value of the reading = Slump value TEST FOR CONCRET WORKABILITY :-
Slump test- अवपात परिक्षण
Compaction factor test- संहनन गुणक परीक्षण
Flow table test-फ्लो टेबल टेस्ट
Kelly ball test
Vee-Bee consistometer test-बी०बी० संधनतामापी परीक्षण
K Slump Test
Kelly Ball Test एक साधारण फील्ड टेस्ट है जो वास्तविक समय में कंक्रीट की कार्य क्षमता का निर्धारण करने में बहुत उपयोगी है। यह उचित है कि केली बॉल टेस्ट ने तेजी से प्रदर्शन किया और मंदी परीक्षण की तुलना में बड़ी सटीकता के साथ सटीक परिणाम प्रदान किए। लेकिन केली बॉल टेस्ट के साथ एकमात्र नुकसान यह है कि कंक्रीट के स्लंप टेस्ट की तुलना में बड़ी मात्रा में कंक्रीट की आवश्यकता होती है।
Kelly Ball Test को पहले ASTM C360-92 के रूप में मानकीकृत किया गया था: “ताजा मिश्रित हाइड्रोलिक सीमेंट कंक्रीट में गेंद प्रवेश के लिए मानक परीक्षण विधि।” उपयोग की कमी के कारण 1999 में ASTM मानक को निलंबित कर दिया गया था। संयुक्त राज्य अमेरिका (बार्टोस 1992) के बाहर परीक्षण का व्यापक रूप से उपयोग नहीं किया गया है। भारतीय मानकों ने इस परीक्षण को कवर नहीं किया है।
Apparatus of Kelly Ball Test :-
Kelly Ball Test उपकरण में एक सिलेंडर होता है जिसमें एक सिरा 15 सेमी वजन के 13.6 किलोग्राम के गोलार्द्ध के आकार का होता है, और दूसरा छोर एक स्नातक पैमाने और हैंडल से जुड़ा होता है। पूरी व्यवस्था एक निश्चित स्टैंड पर सुरक्षित है।
ताजा कंक्रीट पर स्वतंत्र रूप से रखे जाने पर गोलार्ध द्वारा किए गए प्रवेश को मापकर परिणाम निर्दिष्ट किए गए हैं। छाप को तुरंत स्नातक स्तर से मापा जाता है।
READ ALSO-K Slump Test of Concrete कंक्रीट की सुकार्यता के लिए के स्लंप परिक्षण
Procedure of Kelly Ball Test:-
ताजा मिश्रित कंक्रीट (परीक्षण नमूना) को 20 सेमी की गहराई तक एक कंटेनर में डाला जाता है। एक बार जब कंटेनर कंक्रीट से भर जाता है, तो शीर्ष सतह को समतल कर दिया जाता है और काट दिया जाता है।
केली बॉल सेटअप को कंक्रीट पर रखा जाता है जैसा कि नीचे दिखाया गया है, गोलार्ध के हैंडल को इस तरह पकड़कर कि फ्रेम कंक्रीट की सतह को छूता है।
सुनिश्चित करें कि सेटअप को कंटेनर के सिरों से कम से कम 23 सेमी दूर रखा गया है।अब हैंडल को छोड़ दें और गेंद को कंक्रीट में घुसने दें।
एक बार गेंद को छोड़ने के बाद, प्रवेश की गहराई को तुरंत स्नातकपैमानेमें निकटतम 6 मिमी तक दिखाया जाता है।संलग्न स्नातक पैमाने से प्रवेश की गहराई को नोट करें।
एक ही प्रयोग को कंटेनर में अलग-अलग हिस्सों में तीन बार दोहराएं और मान को औसत करें।केली गेंद परीक्षण के लाभ:-
- मंदी परीक्षण की तुलना में परीक्षण के परिणाम अधिक सटीक होते हैं।
- यह परीक्षण एक सरल और तत्काल है जो साइट पर प्रदर्शन कर सकता है।
- कंक्रीट की व्यावहारिकता का पता लगाने के लिए लंबी गणना की आवश्यकता नहीं होती है।
केली गेंद परीक्षण के नुकसान:-
- Kelly Ball Test टेस्ट बड़े आकार के समुच्चय के लिए उपयुक्त नहीं है।
- कंक्रीट का परीक्षण करने के लिए कंक्रीट की सतह को समतल किया जाना चाहिए।
- यह परीक्षण भारतीय मानकों द्वारा मान्यता प्राप्त और उपयोग नहीं किया जाता है।
- बड़ा समुच्चय परिणामों को प्रभावित कर सकता है|
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