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TESTS ON CEMENT

FIELD TESTS ON CEMENT

Field tests on cements are carried to know the quality of cement supplied at site. It gives some idea about cement quality based on colour, touch and feel and other tests.

 The following are the field tests on cement:

 (a) The colour of the cement should be uniform. It should be grey colour with a light greenish shade.
(b) The cement should be free from any hard lumps. Such lumps are formed by the absorption of moisture from the atmosphere. Any bag of cement containing such lumps should be rejected.
(c) The cement should feel smooth when touched or rubbed in between fingers. If it is felt rough, it indicates adulteration with sand.
(d) If hand is inserted in a bag of cement or heap of cement, it should feel cool and not warm.
(e) If a small quantity of cement is thrown in a bucket of water, the particles should float for some time before it sink.
(f) A thick paste of cement with water is made on a piece of glass plate and it is kept under water for 24 hours. It should set and not crack.
(g) A block of cement 25 mm ×25 mm and 200 mm long is prepared and it is immersed for 7 days in water. It is then placed on supports 15cm apart and it is loaded with a weight of about 34 kg. The block should not show signs of failure.
(h) The briquettes of a lean mortar (1:6) are made. The size of briquette may be about 75 mm ×25 mm ×12 mm. They are immersed in water for a period of 3 days after drying. If cement is of sound quality such briquettes will not be broken easily.
  • Ordinary Portland Cement (OPC) 43 Grade Cement: It is used majorly for wall plastering works, Non-RCC structures, pathways etc. ...
  • Ordinary Portland Cement (OPC), 53 Grade Cement: ...
  • Portland Pozzolana Cement (PPC): ...
  • Portland Slag Cement (PSC): ...
  • White Cement:

 FIELD TESTS CEMENT पर

साइट पर आपूर्ति किए गए सीमेंट की गुणवत्ता जानने के लिए सीमेंट पर फील्ड परीक्षण किया जाता है। यह रंग, स्पर्श और महसूस और अन्य परीक्षणों के आधार पर सीमेंट की गुणवत्ता के बारे में कुछ विचार देता है।

सीमेंट पर क्षेत्र परीक्षण निम्नलिखित हैं:

(ए) सीमेंट का रंग एक समान होना चाहिए। यह हल्के हरे रंग की छाया के साथ ग्रे रंग होना चाहिए।

 (b) सीमेंट किसी भी सख्त गांठ से मुक्त होना चाहिए। इस तरह की गांठें वातावरण से नमी के अवशोषण द्वारा बनाई जाती हैं। ऐसे गांठ वाले सीमेंट के किसी भी बैग को अस्वीकार कर दिया जाना चाहिए।

 (c) उंगलियों के बीच में छूने या घिसने पर सीमेंट को चिकना महसूस करना चाहिए। यदि यह मोटा महसूस होता है, तो यह रेत के साथ मिलावट को इंगित करता है।

 (d) यदि हाथ सीमेंट के ढेर या सीमेंट के ढेर में डाला जाता है, तो इसे ठंडा और गर्म नहीं होना चाहिए।

 (e) यदि सीमेंट की एक छोटी मात्रा को पानी की एक बाल्टी में फेंक दिया जाता है, तो कणों को डूबने से पहले कुछ समय के लिए तैरना चाहिए।

 (f) पानी के साथ सीमेंट का गाढ़ा पेस्ट कांच की प्लेट के टुकड़े पर बनाया जाता है और इसे 24 घंटे तक पानी में रखा जाता है। इसे सेट करना चाहिए और दरार नहीं।

 (छ) सीमेंट का एक खंड २५ मिमी × २५ मिमी और २०० मिमी लंबा तैयार किया जाता है और इसे in दिनों के लिए पानी में डुबोया जाता है। इसके बाद इसे 15 सेमी के समर्थन पर रखा जाता है और इसे लगभग 34 किलोग्राम वजन के साथ लोड किया जाता है। ब्लॉक में विफलता के लक्षण नहीं दिखना चाहिए।
(ज) एक दुबले मोर्टार (१: ६) की ब्रिकेट बनाई जाती हैं। ईट का आकार लगभग 75 मिमी × 25 मिमी × 12 मिमी हो सकता है। वे सूखने के बाद 3 दिनों की अवधि के लिए पानी में डूबे रहते हैं। यदि सीमेंट ध्वनि की गुणवत्ता का है तो ऐसे ब्रिकेट आसानी से नहीं टूटेंगे।
TESTS ON CEMENT

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