{"id":90813,"date":"2025-06-01T10:38:09","date_gmt":"2025-06-01T10:38:09","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=90813"},"modified":"2025-06-01T10:38:09","modified_gmt":"2025-06-01T10:38:09","slug":"which-one-of-the-following-statements-is-not-correct-regarding-the-set","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/","title":{"rendered":"Which one of the following statements is not correct regarding the set"},"content":{"rendered":"

Which one of the following statements is not correct regarding the setting of cement?<\/p>\n

[amp_mcq option1=”The addition of a small percentage of gypsum (CaSO4<\/sub>) lengthens the setting period of cement.” option2=”According to the colloidal theory, gels of hydrated silicates are formed and when these gels harden, the set cement loses strength.” option3=”Tricalcium silicate is responsible for initial setting of cement.” option4=”Dicalcium silicate and tricalcium silicate are responsible for the final strength which occurs in about a year.” correct=”option2″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC CAPF – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe incorrect statement is that according to the colloidal theory, gels harden and the set cement loses strength. When the gels formed during the hydration of cement silicates harden, they form a rigid structure that gives the set cement its strength. Therefore, hardening of gels leads to an *increase* in strength, not a loss.
\n<\/section>\n
\nThe setting and hardening of cement are complex processes involving the hydration of its components. The colloidal theory describes the formation of hydration products as gels that eventually solidify. Gypsum (CaSO\u2084\u00b72H\u2082O) is added to cement clinker to retard the setting time, preventing flash setting and allowing sufficient time for mixing, placing, and finishing. Tricalcium silicate (C\u2083S) hydrates relatively quickly and is primarily responsible for the initial set and early strength. Dicalcium silicate (C\u2082S) hydrates slowly and contributes significantly to the long-term strength gain of concrete.
\n<\/section>\n
\nThe main components of Portland cement clinker are tricalcium silicate (alite), dicalcium silicate (belite), tricalcium aluminate (celite), and tetracalcium aluminoferrite (ferrite). The hydration reactions of these compounds produce hydrated calcium silicates (C-S-H gel) and calcium hydroxide, which are the main products responsible for binding the aggregates together and providing strength. The C-S-H gel is a colloidal substance that hardens over time.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following statements is not correct regarding the setting of cement? [amp_mcq option1=”The addition of a small percentage of gypsum (CaSO4) lengthens the setting period of cement.” option2=”According to the colloidal theory, gels of hydrated silicates are formed and when these gels harden, the set cement loses strength.” option3=”Tricalcium silicate is responsible … <\/p>\n

Detailed SolutionWhich one of the following statements is not correct regarding the set<\/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":[1085],"tags":[1105,1096,1239],"class_list":["post-90813","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1105","tag-chemistry","tag-inorganic-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following statements is not correct regarding the set<\/title>\n<meta name=\"description\" content=\"The incorrect statement is that according to the colloidal theory, gels harden and the set cement loses strength. When the gels formed during the hydration of cement silicates harden, they form a rigid structure that gives the set cement its strength. Therefore, hardening of gels leads to an *increase* in strength, not a loss. The setting and hardening of cement are complex processes involving the hydration of its components. The colloidal theory describes the formation of hydration products as gels that eventually solidify. Gypsum (CaSO\u2084\u00b72H\u2082O) is added to cement clinker to retard the setting time, preventing flash setting and allowing sufficient time for mixing, placing, and finishing. Tricalcium silicate (C\u2083S) hydrates relatively quickly and is primarily responsible for the initial set and early strength. Dicalcium silicate (C\u2082S) hydrates slowly and contributes significantly to the long-term strength gain of concrete.\" \/>\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\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following statements is not correct regarding the set\" \/>\n<meta property=\"og:description\" content=\"The incorrect statement is that according to the colloidal theory, gels harden and the set cement loses strength. When the gels formed during the hydration of cement silicates harden, they form a rigid structure that gives the set cement its strength. Therefore, hardening of gels leads to an *increase* in strength, not a loss. The setting and hardening of cement are complex processes involving the hydration of its components. The colloidal theory describes the formation of hydration products as gels that eventually solidify. Gypsum (CaSO\u2084\u00b72H\u2082O) is added to cement clinker to retard the setting time, preventing flash setting and allowing sufficient time for mixing, placing, and finishing. Tricalcium silicate (C\u2083S) hydrates relatively quickly and is primarily responsible for the initial set and early strength. Dicalcium silicate (C\u2082S) hydrates slowly and contributes significantly to the long-term strength gain of concrete.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:38:09+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":"Which one of the following statements is not correct regarding the set","description":"The incorrect statement is that according to the colloidal theory, gels harden and the set cement loses strength. When the gels formed during the hydration of cement silicates harden, they form a rigid structure that gives the set cement its strength. Therefore, hardening of gels leads to an *increase* in strength, not a loss. The setting and hardening of cement are complex processes involving the hydration of its components. The colloidal theory describes the formation of hydration products as gels that eventually solidify. Gypsum (CaSO\u2084\u00b72H\u2082O) is added to cement clinker to retard the setting time, preventing flash setting and allowing sufficient time for mixing, placing, and finishing. Tricalcium silicate (C\u2083S) hydrates relatively quickly and is primarily responsible for the initial set and early strength. Dicalcium silicate (C\u2082S) hydrates slowly and contributes significantly to the long-term strength gain of concrete.","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\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following statements is not correct regarding the set","og_description":"The incorrect statement is that according to the colloidal theory, gels harden and the set cement loses strength. When the gels formed during the hydration of cement silicates harden, they form a rigid structure that gives the set cement its strength. Therefore, hardening of gels leads to an *increase* in strength, not a loss. The setting and hardening of cement are complex processes involving the hydration of its components. The colloidal theory describes the formation of hydration products as gels that eventually solidify. Gypsum (CaSO\u2084\u00b72H\u2082O) is added to cement clinker to retard the setting time, preventing flash setting and allowing sufficient time for mixing, placing, and finishing. Tricalcium silicate (C\u2083S) hydrates relatively quickly and is primarily responsible for the initial set and early strength. Dicalcium silicate (C\u2082S) hydrates slowly and contributes significantly to the long-term strength gain of concrete.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T10:38:09+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\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-is-not-correct-regarding-the-set\/","name":"Which one of the following statements is not correct regarding the set","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T10:38:09+00:00","dateModified":"2025-06-01T10:38:09+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The incorrect statement is that according to the colloidal theory, gels harden and the set cement loses strength. 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