{"id":88144,"date":"2025-06-01T07:03:22","date_gmt":"2025-06-01T07:03:22","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88144"},"modified":"2025-06-01T07:03:22","modified_gmt":"2025-06-01T07:03:22","slug":"addition-of-gypsum-to-cement","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/","title":{"rendered":"Addition of gypsum to cement:"},"content":{"rendered":"

Addition of gypsum to cement:<\/p>\n

[amp_mcq option1=”reduces setting time of cement” option2=”produces very light colour cement” option3=”increases setting time of cement” option4=”shining surface is formed” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2015<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is C. Addition of gypsum to cement increases the setting time of cement.
\n<\/section>\n
\n– Cement clinker, when mixed with water, undergoes rapid hydration reactions, especially involving tricalcium aluminate (C\u2083A), which can lead to flash setting (very rapid hardening).
\n– Gypsum (calcium sulfate dihydrate) is added to the cement clinker during grinding to act as a retarder.
\n– Gypsum reacts with C\u2083A to form ettringite, which precipitates on the surface of the C\u2083A particles, forming a barrier that slows down the rapid hydration of C\u2083A.
\n– This allows sufficient time for the cement paste or concrete to be mixed, transported, placed, and finished before it begins to harden.
\n<\/section>\n
\nThe amount of gypsum added is carefully controlled (typically 2-5% by weight of clinker) as too little or too much can adversely affect the setting properties and strength development of the cement.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Addition of gypsum to cement: [amp_mcq option1=”reduces setting time of cement” option2=”produces very light colour cement” option3=”increases setting time of cement” option4=”shining surface is formed” correct=”option3″] This question was previously asked in UPSC NDA-2 – 2015 Download PDFAttempt Online The correct answer is C. Addition of gypsum to cement increases the setting time of cement. … <\/p>\n

Detailed SolutionAddition of gypsum to cement:<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1094],"tags":[1443,1096,1115],"class_list":["post-88144","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1443","tag-chemistry","tag-miscellaneous","no-featured-image-padding"],"yoast_head":"\nAddition of gypsum to cement:<\/title>\n<meta name=\"description\" content=\"The correct answer is C. Addition of gypsum to cement increases the setting time of cement. - Cement clinker, when mixed with water, undergoes rapid hydration reactions, especially involving tricalcium aluminate (C\u2083A), which can lead to flash setting (very rapid hardening). - Gypsum (calcium sulfate dihydrate) is added to the cement clinker during grinding to act as a retarder. - Gypsum reacts with C\u2083A to form ettringite, which precipitates on the surface of the C\u2083A particles, forming a barrier that slows down the rapid hydration of C\u2083A. - This allows sufficient time for the cement paste or concrete to be mixed, transported, placed, and finished before it begins to harden.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Addition of gypsum to cement:\" \/>\n<meta property=\"og:description\" content=\"The correct answer is C. Addition of gypsum to cement increases the setting time of cement. - Cement clinker, when mixed with water, undergoes rapid hydration reactions, especially involving tricalcium aluminate (C\u2083A), which can lead to flash setting (very rapid hardening). - Gypsum (calcium sulfate dihydrate) is added to the cement clinker during grinding to act as a retarder. - Gypsum reacts with C\u2083A to form ettringite, which precipitates on the surface of the C\u2083A particles, forming a barrier that slows down the rapid hydration of C\u2083A. - This allows sufficient time for the cement paste or concrete to be mixed, transported, placed, and finished before it begins to harden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:03:22+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Addition of gypsum to cement:","description":"The correct answer is C. Addition of gypsum to cement increases the setting time of cement. - Cement clinker, when mixed with water, undergoes rapid hydration reactions, especially involving tricalcium aluminate (C\u2083A), which can lead to flash setting (very rapid hardening). - Gypsum (calcium sulfate dihydrate) is added to the cement clinker during grinding to act as a retarder. - Gypsum reacts with C\u2083A to form ettringite, which precipitates on the surface of the C\u2083A particles, forming a barrier that slows down the rapid hydration of C\u2083A. - This allows sufficient time for the cement paste or concrete to be mixed, transported, placed, and finished before it begins to harden.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/","og_locale":"en_US","og_type":"article","og_title":"Addition of gypsum to cement:","og_description":"The correct answer is C. Addition of gypsum to cement increases the setting time of cement. - Cement clinker, when mixed with water, undergoes rapid hydration reactions, especially involving tricalcium aluminate (C\u2083A), which can lead to flash setting (very rapid hardening). - Gypsum (calcium sulfate dihydrate) is added to the cement clinker during grinding to act as a retarder. - Gypsum reacts with C\u2083A to form ettringite, which precipitates on the surface of the C\u2083A particles, forming a barrier that slows down the rapid hydration of C\u2083A. - This allows sufficient time for the cement paste or concrete to be mixed, transported, placed, and finished before it begins to harden.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:03:22+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/","url":"https:\/\/exam.pscnotes.com\/mcq\/addition-of-gypsum-to-cement\/","name":"Addition of gypsum to cement:","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:03:22+00:00","dateModified":"2025-06-01T07:03:22+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct answer is C. 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