دانلود رایکان مقاله انگلیسی ISI با موضوع ویژگی های رئولوژیکی وابسته به زمان بتن خود متراکم حاوی مواد افزودنی مختلف معدنی
عنوان فارسی مقاله:
ویژگی های رئولوژیکی وابسته به زمان بتن خود متراکم حاوی مواد افزودنی مختلف معدنی
عنوان انگلیسی مقاله:
Time-dependent rheological characteristics of self-consolidating concrete containing various mineral admixtures
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Abstract
The study herein was intended to evaluate the influence of elapsing time on rheological properties and thixotropy of self-consolidating concrete (SCC) mixtures containing various mineral admixtures. For this purpose, variation of T50 flow time, torque plastic viscosity, apparent yield stress and thixotropy were investigated as a function of time in a standstill condition. Various amounts of silica fume (SF), metakaolin (MK), Class F fly ash (FAF), Class C fly ash (FAC) and granulated blast-furnace slag (BFS) were utilized in binary, ternary and quaternary cementitious blends in 17 different SCC mixtures having a constant slump flow value. The results showed that SCC mixtures containing various mineral admixtures were highly stable or moderately stable (VSI between 0 and 1) at 0 min according to ASTM C 1611. However, mixtures containing FAC, FAF and BFS exhibited some bleeding and segregation at 50 min. In a standstill condition, apparent yield stress and thixotropy increased significantly with time while torque plastic viscosity values changed only in a limited range. In addition, with elapsing time, MK and FAC were found to have more influence on torque plastic viscosity and yield stress values in comparison with the other admixtures. However, increase in the yield values were more pronounced in comparison with the torque plastic viscosity values. Increase in thixotropy with time for the SF and MK blended mixtures were higher when compared to the control mixtures and mixtures containing the other mineral admixtures
چکیده
هدف این مطالعه ارزیابی تأثیر زمان سپری‌شده روی خواص رئولوژیکی و تیکسوتروپی مخلوط‌های بتن خودتحکیم (SCC) حاوی افزودنی‌های معدنی مختلف است. برای این منظور، تغییرات زمان روانی T50، لزجت پلاستیک گشتاور پیچشی، تنش تسلیم ظاهری و تیکسوتروپی به‌صورت تابعی از زمان در شرایط سکون بررسی شد. مقادیر مختلف فوم سیلیکا (SF)، متاکائولن (MK)، خاکستر بادی رده F(FAF) و سرباره دانه‌ای شده کوره آهن‌گدازی (BFS) به‌صورت مخلوط‌های دوتایی، سه‌تایی و چهارتایی سیمانی در 17 SCC مختلف با مقدار روانی اسلامپ ثابت استفاده شدند. نتایج حاکی از این بود که مخلوط‌های SCC حاوی افزودنی‌های معدنی مختلف در زمان صفر براساس استاندارد ASTM C1611 دارای پایداری زیاد یا متوسطند (VSI بین صفر و 1). هرچند، در مخلوط‌های حاوی FAC، FAF و BFS در زمان 50 دقیقه فرار سیال و تفکیک ذرات بتن مشاهده شد. در شرایط سکون، تنش تسلیم ظاهری و تیکسوتروپی با گذر زمان تا حد زیادی افزایش پیدا کرد، درحالی‌که، لزجت پلاستیک گشتاور پیچشی تنها در دامنه محدودی تغییر یافت. افزون بر این، با گذر زمان، مشخص شد که MK و FAC در مقایسه با سایر افزودنی‌ها تأثیر بیشتری روی لزجت پلاستیک گشتاور پیچشی و تنش تسلیم دارند. هرچند، افزایش مقادیر تنش نسبت به لزجت پلاستیک گشتاور پیچشی محسوس‌تر بود. افزایش در تیکسوتروپی با گذر زمان برای مخلوط‌های حاوی SF و MK در قیاس با مخلوط‌های کنترل و مخلوط‌های حاوی سایر افزودنی‌های معدنی بیشتر بود.
کلمات کلیدی
Time-dependent rheological characteristics of self-consolidating ... https://www.sciencedirect.com/science/article/pii/S0950061815004493 by RS Ahari - 2015 - Cited by 7 - Related articles Jul 30, 2015 - Time-dependent rheology of SCC with various mineral admixtures was ... concrete (SCC) mixtures containing various mineral admixtures. [PDF]Time-dependent rheological characteristics of self-consolidating ... iranarze.ir/wp-content/uploads/2017/08/7369-English-IranArze.pdf by RS Ahari - 2015 - Cited by 7 - Related articles Apr 24, 2015 - Time-dependent rheology of SCC with various mineral admixtures was ... thixotropy of self-consolidating concrete (SCC) mixtures containing ... (PDF) Correlating Rheology of Self-Consolidating Concrete to ... https://www.researchgate.net/.../279894256_Correlating_Rheology_of_Self-Consolidati... All SCC mixtures were proportioned with 450 kg/m 3 (758.5 lb/yd 3) of ternary silica fumeground granulated blast-furnace slag cement. .... the rheological properties of concrete from those of the mortar ... is reversible and time-dependent. ..... Containing Various Mineral Admixtures,” Proceedings of the 1st International. Effect of rheological parameters on self compactability of - Technische ... https://www.tib.eu/en/search/.../Effect-of-rheological-parameters-on-self-compactabilit... ... on self compactability of concrete containing various mineral admixtures (English) ..... Time-dependent rheological characteristics of self-consolidating concrete ... [PDF]Effect of various supplementary cementitious materials on rheological ... https://core.ac.uk/download/pdf/93243604.pdf by RS Ahari - 2015 - Cited by 31 - Related articles Nov 26, 2014 - In design of self-consolidating concrete (SCC) for a given ... In this study, the rheological properties of 57 SCC mixtures with ... and V-funnel time values in comparison with mixtures containing only .... of a viscosity modifying admixture (VMA) to those of SCM. ..... 5d, in rich (w/b = 0.44) SCC mixtures, varying. [PDF]Thixotropy and structural breakdown properties of self consolidating ... https://core.ac.uk/download/pdf/93243227.pdf by RS Ahari - 2015 - Cited by 13 - Related articles concrete containing various supplementary cementitious materials. Reza Saleh Ahari .... rheological properties, thixotropic and structural breakdown behavior of ... [PDF]Rheological Properties Of Self-Consolidating Concrete Incorporating ... digital.library.ryerson.ca/.../Rheological_Properties_Of_Self-Consolidating_Concrete_... Jan 1, 2009 - the water cement ratio of all SCC mixtures was kept constant. ..... The use of such mineral admixtures can improve the slump flow and .... containing silica fume can have very high strength and can be very durable ..... Therefore, both the initial as well as the final setting times are dependent upon the. Reza Saleh Ahari - Google Scholar Citations scholar.google.com/citations?user=eDVgZPQAAAAJ&hl=en Time-dependent rheological characteristics of self-consolidating concrete containing various mineral admixtures. RS Ahari, TK Erdem, K Ramyar. Construction ... [PDF]Rheology of SCC www.cbi.se/download.do?ug=Administrator&f=SCC+Workshop+1+June... Jul 10, 2012 - structuration characteristic time (typically several minutes) and a de-structuration characteristic time of several ..... Varying the proportions of sand and coarse aggregate (CA) can result in either increased or .... Pastes Containing Mineral Admixtures: Consequences of Self-Consolidating Concrete. Design ...
