Rebound Hammer Test

Rebound Hammer Test of Concrete

[IS 13311 (Part 2) – 1992]

 यह परीक्षण एक गैर-विनाशकारी (कंक्रीट का एनडीटी परीक्षण) Non-destructive (NDT test of Concrete)  और सरल कंक्रीट परीक्षण है जिसका उपयोग बिना किसी क्षति के कंक्रीट की संपीड़न शक्ति का परीक्षण करने के लिए किया जाता है। इसके अलावा, टेस्ट का सबसे अच्छा हिस्सा यह है कि बिना किसी नुकसान के लैब में जाने के बजाय साइट पर वास्तविक समय में कंक्रीट का परीक्षण किया जा सकता है।

Rebound Rammer Test is Code [IS 13311 (Part 2) – 1992] कंक्रीट को नष्ट किए बिना या सख्त होने के बाद उसे तोड़े बिना उसकी ताकत का परीक्षण करना एक जटिल कार्य है।जैसा कि हमने पहले ही कंक्रीट क्यूब टेस्ट द्वारा कंक्रीट की कंप्रेसिव स्ट्रेंथ के बारे में चर्चा की थी, जो लैब में काम किया गया एक विनाशकारी परीक्षण है। आप यहाँ उल्लेख कर सकते हैं

About Schmidt Hammer Appratus:-

Schidmt हैमर में स्प्रिंग लोडेड हैमर होता है इलास्टिक मास (परीक्षण उपकरण) एक प्लंजर के साथ समाप्त होता है जिसे आसानी से आपके हाथ से संचालित किया जा सकता है। यह हथौड़ा नमूने की सतह पर प्रभावित होता है।

Schidmt हथौड़ा ने परिभाषित ऊर्जा पर कंक्रीट को मारा, और रिबाउंड संख्या को लेखक की मदद से मापा जाता है और रिबाउंड संख्या कंक्रीट की संपीड़न शक्ति से संबंधित होती है।

Rebound Hammer Test समझने के लिए, एक रबर बैंड लें और इसे विपरीत रूप से फैलाएं, रबरबैंड में एक लोचदार गुण होता है जिसे वह पुनः प्राप्त करता है या अपनी मूल स्थिति में वापस आ जाता है।

हैमर के बारे में अधिक जानकारी के लिए श्मिट रिबाउंड हैमर का निम्न आंकड़ा देखें:

Procedure Rebound Hammer Test:-

प्रक्रिया शुरू करने से पहले हथौड़े का अंशांकन आवश्यक है। ऐसा करने के लिए, श्मिट हथौड़ा का परीक्षण स्टील टेस्ट एविल के खिलाफ किया जाता है जिसमें लगभग 5000MPa की ब्रिनेल कठोरता संख्या होती है।

  • कंक्रीट की सतह को साफ करें, सुनिश्चित करें कि कंक्रीट साफ और गंदगी मुक्त है।
  • जैसा कि रिबाउंड हैमर के संचालन में उल्लेख किया गया है,
  • इसमें पहले चरण में चार चरण शामिल हैं, रिबाउंड नंबर खोजने के लिए हथौड़े को संरचना की कंक्रीट सतह पर समकोण पर रखा जाता है।
    सुनिश्चित करें कि हथौड़े को कंक्रीट की सतह पर बिल्कुल समकोण रखा गया है,
  • अन्य कोण परिणामों में विसंगति दिखा सकते हैं।

Operation of the Schmidt Rebound hammer:-

विभिन्न पदों के लिए प्रक्रिया समान है, लेकिन सुनिश्चित करें कि आप परीक्षण नमूने के समकोण में हथौड़ा पकड़ रहे हैं। मान लीजिए कि स्तंभ की ताकत का परीक्षण करने के लिए क्षैतिज स्थिति लागू की जाती है। इसी तरह बीम की ताकत के परीक्षण के लिए वर्टिकल अपवर्ड पोजीशन लागू किया जाता है।हैमर को स्थिति में रखने के बाद, प्रभाव ऊर्जा के साथ कंक्रीट की सतह से टकराने के लिए प्लंजर बनाया जाता है।नीचे दी गई तालिका में अनुमानित प्रभाव ऊर्जा स्तरों का उल्लेख किया गया है। कंक्रीट के विभिन्न अनुप्रयोगों के लिए प्रभाव ऊर्जा अलग है।

S.R.ApplicationsImpact Energy for Rebound Hammer in Nm
1light weight concrete0.75
2Normal Weight Concrete2.25
3For mass concrete testing Eg: In roads, hydraulic structures and pavements30

 

  • प्लंजर को कंक्रीट की सतह की ओर धकेलने के बाद, यह वापस रिबाउंड करता है और एक ग्रैजुएट स्केल में रीडिंग दिखाता है जिसे रिबाउंड नंबर के रूप में नोट किया जाता है।
  • रिबाउंड नंबर के 5-6 रीडिंग को मापा जाता है और रिबाउंड इंडेक्स के परिणामों को औसत करता है।
  • रिबाउंड इंडेक्स खोजने के बाद, नीचे दिए गए ग्राफ का उपयोग करके मूल्य को कंप्रेसिव स्ट्रेंथ के साथ सहसंबद्ध किया जाता है।

Rebound Hammer Test Graph:-

Rebound Hammer Test Graph

मान लीजिए, यदि ग्राफ के अनुसार क्षैतिज स्थिति (कंक्रीट कॉलम) के लिए औसत रिबाउंड संख्या 38 (रिबाउंड इंडेक्स) है तो कंप्रेसिव स्ट्रेंथ 36N/mm2 है नीचे दी गई तालिका रिबाउंड संख्या के विभिन्न मूल्यों के लिए कंक्रीट की गुणवत्ता देती है।

S.R.Average Rebound numberQuality of concrete
1>40Very good hard layer
230 to 40Good Layer
320 to 30Fair
4<20Poor concrete
50Delaminated

Advantages of Rebound hammer:-

  • यह एक सरल और त्वरित परीक्षण है जिसे साइट पर किया जा सकता है।
  • इस परीक्षण में संपीडन शक्ति का पता लगाने के लिए किसी गणना की आवश्यकता नहीं है, एक प्रतिक्षेप संख्या का पता लगाएं और इसे ग्राफ में सहसंबंधित करें।
  • यह एक विनाशकारी परीक्षण है जो पुराने स्मारकों की ताकत का पता लगाने में बहुत मददगार है।
  • कंक्रीट की कंप्रेसिव स्ट्रेंथ का पता लगाने के लिए यूनिवर्सल टेस्टिंग मशीन की तुलना में रिबाउंड हैमर की कीमत कम होती है।
  • इस पद्धति का उपयोग न केवल कंक्रीट की संपीड़न शक्ति का पता लगाने के लिए किया जाता है, बल्कि यह एक विशेष तत्व की दूसरे से तुलना करने और ठोस एकरूपता और गुणवत्ता को खोजने में भी मदद करता है।
141 thoughts on “Rebound Hammer Test of Concrete कंक्रीट का रिबाउंड हैमर टेस्ट”
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