Soundness Test for Cement
सीमेन्ट का निर्दोषता परीक्षण
I.S.- [4031-1988]
- उद्देश्य (Object):-
इस परिक्षण से सीमेंट में मुक्त अवस्था में विद्यमान चूना (Free Lime) व मैग्नीशिया( Mgo) का पता लगाना |
- सिद्धान्त (Theory):-
सीमेन्ट (मसाला अथवा कंक्रीट) के सैट होने पर इसके आयतन में अधिक बढ़ोतरी नहीं होनी चाहिये, अन्यथा संरचना में दरारें पड़ जाती है और यह क्षतिग्रस्त हो सकती है। इसके लिये आवश्यक है कि सीमेन्ट में असंयुक्त चूना व मैग्नीशिया (जो सीमेन्ट के आवश्यक घटक हैं) की मात्रा निर्धारित सीमा से अधिक नहीं होनी चाहिये।सीमेन्ट में विद्यमान असंयुक्त (मुक्त) चूना पानी के साथ प्रतिक्रिया करके अत्यधिक फूलने लगता है, जिससे सीमेन्ट कार्य (कंक्रीट आदि) का आयतन भी बढ़ता हैं। मैग्नीशिया भी इसी प्रकार फूलता है, परन्तु मुक्त चूना की तुलना में इसकी फूलने की दर कुछ कम । होती है।असंयुक्त चूना व मैग्नीशिया के कारण जब साधारण पोर्टलैण्ड सीमेन्ट (O.P.C) का प्रसार 10 mm से अधिक होता है (निर्धारित जाँच करने पर ), तो सीमेन्ट दोषपूर्ण है।
निर्दोषता परीक्षण ली-चैटिलियर उपकरण से किया जाता है। यह उपकरण (चित्र ) में दर्शाया गया है।
- सामग्री (Materials):-
- cement sample
- साफ पानी।
- उपकरण(Apparatus):-
ली-चैटिलियर उपकरण
- ली चैटिलियर उपकरण
- तामचीनी की ट्रे
- करनी, (Trowel)
- तापमापी (थर्मामीटर)
- तुला-क्षमता एक किग्रा व बाट।
- 5 cm x 5 cm माप की काँच की दो प्लेटें
- मापन सिलिण्डर
- विराम घड़ी
- हीटर/स्टोव
- विधि(Method):-
- 50 gm सीमेन्ट शुद्धता से तोलकर ट्रे में डालें।
- मानक सघनता के पेस्ट के लिये पूर्व ज्ञात जल का 0.78P गुना अर्थात् 0.78P पानी माप कर सीमेन्ट में डालें और सुघट्य पेस्ट बनायें।
- (माना मानक सघनता के लिये सीमेन्ट के भार पर पानी की प्रतिशत मात्रा P है तो निर्दोषता परीक्षण के पेस्ट के लिये पानी की मात्रा 0.78P होगी।)
- साँचे को काँच की प्लेट पर रखकर उसमें उपरोक्त पेस्ट ऊपरी किनारों तक भर दें। ध्यान रहे साँचा भरते समय इसकी झिर्री (Slot) फैलने न पाये।
- साँचे के ऊपर दूसरी काँच प्लेट रखकर इसे ढक दें और इस काँच प्लेट पर कोई भार रख दें।
- अब उपरोक्त साँचे (प्लेटों सहित) को धीरे से उठाकर (29°C±2°C ) के तापमान वाले पानी में 24 घण्टे तक डुबा कर रखें।
- उपरोक्त अवधि के बाद साँचे को पानी से बाहर निकाल लें और ऊपर-नीचे की प्लेटे हटा दें (सीमेंट पेस्ट साँचे के अन्दर ही सैट रहेगा।)
- पैमाने से सूचकों के सिरों के मध्य की दूरी mm में शुद्धता से नाप लें माना यह दूरी (D1)है।
- अब साँचे को पुनः पानी में भली प्रकार से डुबाये और इस पानी को 25-30 मिनट में उबाल पर लायें और 3 घण्टे तक इसे उबलने दें।
- इस अवधि के बाद साँचे को पानी से निकाल कर ठण्डा होने दें और सूचको के सिरी की दूरी (Gap) पुनः नाप लें (माना यह दूरी (D1) है।)
- दोनों दूरियों का अन्तर (अर्थात्( D1 -D)mm में) सीमेन्ट का प्रसार है। यदि यह अन्तर 10 mm से अधिक है, तो सीमेन्ट दोषपूर्ण है अर्थात् इसमें संयुक्त चूना व मैनीशिया की मात्रा निर्धारित से अधिक है।
प्रेक्षण व गणनायें(Observation):-
S.R. विवरण जांच प्रतिदर्श (gm) I II III 1 सीमेंट प्रतिदर्श का भार 50 50 2 मानक सघनता के लिए पानी की मात्रा (P) 3 सीमेंट पेस्ट क लिए पानी की मात्रा = (0.78 X 50)/100 ml 4 गर्म करने से पहले INDICATOR के बीच की दूरी (D)mm 5 गर्म करने के बाद INDICATOR के बीच की दूरी(D1)mm 6 निर्दोषता का मान = (D1-D)mm
- परिणाम (Result):-
- दोनों पाठ्यांकों का अन्तर (D1- D)= ……mm (यदि यह अन्तर 10mm से अधिक है/नहीं है)
- अत: सीमेन्ट दोषपूर्ण है/नहीं है) ।
सावधानियाँ (precaution):-
- सीमेन्ट व पानी को शुद्धता से तोल/माप कर पेस्ट बनायें।
- साँचे में पेस्ट भरते समय सूचकों के मध्य बनी झिरी (0-5 mm) बढ़नी नहीं चाहिये
- इसके लिये साँचे की गोलाई पर एक महीन धागा बाँध दें. जिसे साँचा गर्म करते समय हटा दें
- पानी को 30 मिनट में धीरे-धीरे उबाल बिन्दु पर लाये और साँचा निर्धारित अवधि तक
- उबलते पानी में पूर्ण रूप से डूबा रहे।
- साँचे को गोलाई से पकड़े, सूचकों से नहीं।
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