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Concrete Curing

कंक्रीट की तराई

Curing of Concrete

Concrete Curing कंक्रीट की तराई | Curing time & Duration | Curing methods

कंक्रीट एक मिश्रित सामग्री है जिसमें उपयुक्त अनुपात में सीमेंट, रेत और पानी होता है। सीमेंट और पानी के बीच रासायनिक संपर्क समुच्चय को बांधता है।

ताजा कंक्रीट प्लास्टिक का होगा ताकि इसे किसी भी वांछित आकार में ढाला जा सके और घने द्रव्यमान बनाने के लिए संकुचित किया जा सके।

कंक्रीट को अपनी प्लास्टिसिटी खोने से पहले एक स्थिति में रखा जाना चाहिए। जिस समय कंक्रीट पूरी तरह से अपनी प्लास्टिसिटी खो देता है

और कठोर हो जाता है उसे कंक्रीट का अंतिम सेटिंग समय कहा जाता है।

Curing of concrete कंक्रीट की तराई:-

ठोस शक्ति विकास और स्थायित्व में इलाज एक महत्वपूर्ण भूमिका निभाता है। कंक्रीट मिश्रण (सीमेंट, रेत और कुल) में पानी डालने के बाद, एक्ज़ोथिर्मिक प्रतिक्रिया (हाइड्रेशन) होती है, जो कंक्रीट को सख्त करने में मदद करती है। कंक्रीट का सख्त होना तत्काल नहीं है और लंबी अवधि तक जारी रहता है, जिसके लिए जलयोजन को संसाधित करने के लिए अधिक मात्रा में पानी की आवश्यकता होती है। इसलिए, कंक्रीट में जलयोजन प्रतिक्रिया पूरी होने तक कंक्रीट को नम रखा गया। इस प्रक्रिया को कंक्रीट का इलाज कहा जाता है।

तराई वह प्रक्रिया है जिसमें वायुमंडलीय तापमान और जलयोजन प्रतिक्रिया के कारण नमी के नुकसान से बचाने के लिए कंक्रीट को नम रखा जाता है।

तराई सीमेंट जलयोजन के दौरान कंक्रीट से नमी के नुकसान की दर और सीमा को नियंत्रित करने की प्रक्रिया है।

Purpose of Curing of Concrete कंक्रीट की तराई का उद्देश्य :-

सीमेंट और पानी के बीच की प्रतिक्रिया को जलयोजन कहा जाता है। यह एक ऊष्माक्षेपी अभिक्रिया है (वह अभिक्रिया जो ऊष्मा उत्पन्न करती है)।

कंक्रीट मिश्रण में पानी मिलाने के बाद, जलयोजन शुरू हो जाता है, जो गर्मी छोड़ने वाली एक्ज़ोथिर्मिक प्रतिक्रिया के कारण कंक्रीट को जल्दी सूखता है। जलयोजन प्रक्रिया को पूरा करने के लिए, कंक्रीट की अधिकतम शक्ति जितनी जल्दी हो सके प्राप्त करने के लिए कंक्रीट को नम रखा जाता है।

जैसा कि कंक्रीट के इलाज के बारे में अक्सर पूछे जाने वाले प्रश्न हैं। नीचे उनमें से कुछ हैं

Procedure for curing of concrete कंक्रीट के तराई की प्रक्रिया:-

कंक्रीट की सतह पर पानी निकालने से कंक्रीट ठीक हो जाती है। कंक्रीट के इलाज के लिए 5°C से अधिक का ठंडा पानी उपयुक्त नहीं है। चूंकि कंक्रीट में जलयोजन प्रतिक्रिया गर्मी को बाहर निकालती है और कंक्रीट को गर्म रखती है, कंक्रीट पर 5°C से कम ठंडे पानी का उपयोग करने से दरार और विफल हो सकती है। कंक्रीट की सतह पर वैकल्पिक रूप से सुखाने और गीला करने से कंक्रीट में बड़ा परिवर्तन होता है और अंततः दरार पड़ जाती है।

What is the curing period of concrete कंक्रीट की क्युरिंग अवधि क्या है?

कंक्रीट को अधिकतम शक्ति प्राप्त करने के लिए उपचारित करने की न्यूनतम अवधि 28 दिन है।

एक स्पष्ट समझ के लिए, नीचे दिए गए ग्राफ़ को देखें।

Levels of Buildings | Plinth Level | Natural Ground Level | Lintel Level

उपरोक्त ग्राफ से, यह स्पष्ट है कि कंक्रीट ने 3-7 दिनों के लिए ठीक होने पर अपनी डिजाइन शक्ति का 50% प्राप्त किया। 75% कंप्रेसिव स्ट्रेंथ 14 दिनों में हासिल की गई। कंक्रीट डिजाइन की 90% ताकत 28 दिनों में हासिल की गई। तो यह स्पष्ट है कि जैसे-जैसे समय बढ़ता है कंक्रीट की ताकत भी बढ़ती जाती है।

Minimum curing time for cement concrete:-

IS 456 – 2000 के अनुसार, सामान्य पोर्टलैंड सीमेंट के लिए कंक्रीट को 7 दिनों से कम समय में तक तराई नहीं किया जाना चाहिए 7 दिनों से अधिक ही करनी चाहिए , और खनिज मिश्रण या मिश्रित सीमेंट के साथ कंक्रीट के लिए यह कम से कम 10 दिनों का होना चाहिए। गर्म मौसम और शुष्क तापमान की स्थिति में, OPCके लिए 10 दिनों से कम और मिश्रित सीमेंट और खनिज मिश्रण के साथ कंक्रीट के लिए 14 दिनों से कम नहीं होना चाहिए।

कंक्रीट का तराई समय या अवधि निम्नलिखित कारकों पर निर्भर है:-

  1. CONCRETE की निर्दिष्ट ताकत
  2. कंक्रीट के ग्रेड
  3. वायुमंडलीय तापमान:
  4. कंक्रीट में सीमेंट और पानी के बीच रासायनिक प्रतिक्रिया के कारण गर्मी निकलती है जिसके लिए जल को पूरा करने के लिए पानी की आवश्यकता होती है। गर्मियों में 50% पानी वाष्पित हो जाता है। इसलिए, धूप के दिनों में अधिक मात्रा में पानी की आवश्यकता होती है।
  5. कंक्रीट सदस्य का आकार और आकार

Concrete Curing Methods:

  • Ponding तालाब बनाकर
  • Wet coverings गीला आवरण:
  • Membrane Curing of Concrete कंक्रीट का झिल्ली इलाज:
  • Synthetic resin curing compound सिंथेटिक राल इलाज यौगिक
  • Acrylic curing compound एक्रिलिक इलाज यौगिक:
  • Wax Curing compound मोम इलाज यौगिक:
  • Chlorinated rubber curing compound क्लोरीनयुक्त रबर इलाज यौगिक:
  • Steam curing of concrete कंक्रीट का भाप इलाज:
  • Curing of Concrete by infrared radiation इन्फ्रारेड विकिरण द्वारा कंक्रीट का इलाज:
  • Curing of concrete by an Electric Current विद्युत धारा द्वारा कंक्रीट का उपचार

Concrete Mix Design IS Code 456:2000 IS कोड़ के अनुसार कंक्रीट मिक्सचर डिजाइन करना
NOTE-

  1. Steam विधि द्वारा PRE-CAST CONCRETE की तराई की जाती है
  2. सबसे अछि तराई विधि मेम्बर को ढांप कर मानी जाती है
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