{"id":2542,"date":"2023-08-05T17:22:06","date_gmt":"2023-08-05T14:22:06","guid":{"rendered":"https:\/\/en.coeng.uobaghdad.edu.iq\/?p=2542"},"modified":"2023-08-05T17:24:27","modified_gmt":"2023-08-05T14:24:27","slug":"examination-of-msc-thesis-in-civil-engineering-department-5","status":"publish","type":"post","link":"https:\/\/en.coeng.uobaghdad.edu.iq\/?p=2542","title":{"rendered":"Examination of MSc Thesis in Civil Engineering Department"},"content":{"rendered":"

College of Engineering \\University of Baghdad, held MSc thesis examination titled<\/strong><\/p>\n

\u00a0<\/strong>\u201cEffect of Recycled Coarse Aggregate on\u00a0 Some Properties of No-Fine Aggregate\u00a0 Concrete\u201d<\/strong><\/p>\n

By student Roaa Kasim and supervised by Prof. Hadeel Khaled, the examination committee consisted of\u00a0 prof.Dr. Nada Mahdi\u00a0\u00a0 as chairman , and membership of\u00a0 Asst. prof. dr.Zena K. Abbas , Assist.\u00a0 prof.Dr.Abdul Kader . After conducting the public discussion and listening to the student\u2019<\/sup>s defense, the thesis was accepted with Excelent\u00a0 degree . The thesis was summarized as follow:<\/strong><\/p>\n

Abstract<\/strong><\/p>\n

\u00a0 No-Fines concrete is a porous structural material produced from cement,\u00a0 <\/strong><\/p>\n

water, and coarse aggregate. It has a large number of voids, which results in its\u00a0 <\/strong><\/p>\n

lightweight and low strength. No-fine concrete has lower compressive strength,\u00a0 <\/strong><\/p>\n

higher permeability and a lower density compared to conventional concrete. Due\u00a0 <\/strong><\/p>\n

to its density and porosity, no-fines concrete has been utilized in constructing\u00a0 <\/strong><\/p>\n

pavements since it is a cost-effective material. It permits rainwater to penetrate\u00a0 <\/strong><\/p>\n

into the ground, recharging the aquifer. Moreover, it is employed in the\u00a0 <\/strong><\/p>\n

construction of partitions and insulation. <\/strong><\/p>\n

\u00a0This research aims to investigate the influence of silica fume and\u00a0 <\/strong><\/p>\n

polypropylene fiber on the properties of no-fine concrete with recycled aggregate.\u00a0 <\/strong><\/p>\n

After several trail mixes the ratios of water to cement and cement to aggregate\u00a0 <\/strong><\/p>\n

were chosen to be 0.3 and 1:4, respectively. The recycled aggregate was\u00a0 <\/strong><\/p>\n

demolished reactive powder concrete used in the percentages of 10%, 20%, and\u00a0 <\/strong><\/p>\n

30% as a substitution for coarse aggregate by volume. The recycled aggregate\u00a0 <\/strong><\/p>\n

percentage of 10% was optimal as it shows the least adverse effect on the no-fine\u00a0 <\/strong><\/p>\n

concrete mixes mechanical properties. The polypropylene fiber was then added\u00a0 <\/strong><\/p>\n

to the no-fine concrete mixes with 10% recycled aggregate in the proportions of\u00a0 <\/strong><\/p>\n

0.5%, 1%, and 1.5% by volume. The optimum percentage of polypropylene fiber\u00a0 <\/strong><\/p>\n

was 0.5%, which improved compressive strength, splitting tensile strength, and\u00a0 <\/strong><\/p>\n

flexural strength by 14.92%, 29%, and 28%, respectively, when compared it to\u00a0 <\/strong><\/p>\n

no-fine concrete mix with 10% recycled aggregate. Silica fume was used as a\u00a0 <\/strong><\/p>\n

partial substitution for cement in the proportions of 5%, 8%, and 10%. The best\u00a0 <\/strong><\/p>\n

percentage of silica fume was 10%, which enhances the compressive strength,\u00a0 <\/strong><\/p>\n

splitting tensile strength, and flexural strength at 28 days by 31.75%, 18%, and\u00a0 <\/strong><\/p>\n

20%, respectively, compared to no-fine concrete mix with 10%. The results show that by using 0.5% polypropylene fiber and 10% silica fume with 10% recycled\u00a0 <\/strong><\/p>\n

aggregate, led to a significant increase in compressive strength, splitting tensile\u00a0 <\/strong><\/p>\n

strength, flexural strength, and modulus of elasticity by 21% and 35.37%,\u00a0 <\/strong><\/p>\n

40.32%, 35%, and 38.19%, respectively, compared to no-fine concrete mix with\u00a0 <\/strong><\/p>\n

10%, While decrease the slump and compacting factor, by 6.13% and 5.68%,\u00a0 <\/strong><\/p>\n

respectively, compared to no-fine concrete mix with 10%. The fresh density was\u00a0 <\/strong><\/p>\n

lower by 0.2% and the dry density higher by 0.6%compared to no-fine concrete\u00a0 <\/strong><\/p>\n

mix with 10%, while the water absorption was lower by 5.1% compared to no-fine concrete mix with 10%<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

College of Engineering \\University of Baghdad, held MSc thesis examination titled \u00a0\u201cEffect of Recycled Coarse Aggregate on\u00a0 Some Properties of … <\/i>\u0627\u0644\u0645\u0632\u064a\u062f<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":2543,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[35,7,4,31],"tags":[],"class_list":["post-2542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-civil-engineering","category-constant-links","category-important-links","category-thesis"],"yoast_head":"\nExamination of MSc Thesis in Civil Engineering Department - College of Engineering<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/en.coeng.uobaghdad.edu.iq\/?p=2542\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Examination of MSc Thesis in Civil Engineering Department - 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