NATIONAL BIBLIOGRAPHY NUMBER
Number
۹۴۶پ
LANGUAGE OF THE ITEM
.Language of Text, Soundtrack etc
per
TITLE AND STATEMENT OF RESPONSIBILITY
Title Proper
بررسی رفتار پیوستگی بین فولاد و بتن خود متراکم
First Statement of Responsibility
/علی غروغی اصل
.PUBLICATION, DISTRIBUTION, ETC
Name of Publisher, Distributor, etc.
تبریز: دانشگاه تبریز، دانشکده عمران، گروه سازه
PHYSICAL DESCRIPTION
Specific Material Designation and Extent of Item
۱۵۲ص.
Other Physical Details
:مصور، جدول، نمودار، عکس۳۰*۲۹س.م-+لوح فشرده
NOTES PERTAINING TO PUBLICATION, DISTRIBUTION, ETC.
Text of Note
چاپی
INTERNAL BIBLIOGRAPHIES/INDEXES NOTE
Text of Note
کتابنامه ص.: ۱۴۸-۱۵۲
DISSERTATION (THESIS) NOTE
Dissertation or thesis details and type of degree
دکترا
Discipline of degree
عمران
Date of degree
۱۳۸۷/۰۶/۲۵
Body granting the degree
تبریز: دانشگاه تبریز، دانشکده عمران، گروه سازه
SUMMARY OR ABSTRACT
Text of Note
با توسعه سازه های بتن مسلح در دنیا، لرزاندن بتن همواره یکی از مسائل اصلی اجرای این نوع سازه ها بوده است بطوریکه عدم لرزاندن بتن و یا لرزاندن ناقص و یا غیر اصولی آن بدلیل نبود و یا کمبود کارگران ماهر، همواره خواص فیزیکی ومکانیکی بتن را با مشکل مواجه کرده است .لذا برای حل این مشکل در سازه های بتن مسلح، در سال ۱۹۸۶ برای اولین بار در ژاپن، بتن خود متراکمCompacting Concrete = SCC) -(Selfتوسط H.Okamura ارائه شد .بتن خود متراکم بدون نیاز به هر گونه انرژی داخلی وخارجی و تنها تحت تأثیر وزن خود از بین میلگردهای حتی خیلی فشرده و متراکم جاری شده و بدون جدا شدن سنگدانه ها تمام گوشه و کنارهای قالب ها را پر می نماید .در این رساله ضمن مروری بر تحقیقات جاری در مورد این نوع بتن، انواع طرح اختلاط های پیشنهادی در دنیا بررسی شده و با ارائه طرح اختلاط ویژه ای، نمونه های مختلفی با استفاده از مصالح موجود محلی تهیه و جهت کنترل خاصیت خود متراکمی آن ها، از آزمایش های تعیین کارآیی،" جریان اسلامپ"،" قیف" Vو" جعبه "L استفاده گردید .با انتخاب نسبت آب به سیمان های مختلف۳۰/۰ ،۴۰/۰ ،۴۵/۰ ،۵۰/۰ و۶۰/۰ ، نم-ونه ه-ای-ی در ابع-اد ۱۰۰ ۱۰۰ ۱۰۰م-یلی م-تری و) ۱۵۰ ۱۵۰ ۱۵۰ ادامه چکیده پایان نامه
Text of Note
By development of reinforced concrete structures in world, in order to make durable concrete, sufficient compacting by skilled workers is required. However, the gradual reduction in number of skilled workers along increasing of concrete projects and precast industries development has led to similar reduction in the physical and mechanical properties of concrete. To solve this problem, Self-Compacting Concrete (SCC) was introduced by H. Okamura in Japan on 1986. SCC can flow consistently under its own weight, pass between bars, and fill in formwork without the need of compaction. The application of SCC effectively resolves the difficulties of concreting in situations with complicated formwork and congested reinforcements with no segregation.In this thesis, a literature review, an investigation of mix design models of this type of concrete, workability of fresh concrete and behavior of bond strength were considered. With a special mix design and with local materials, more than 936 specimens were made for fresh and hardened concrete tests. The workability of samples was evaluated with Slump flow test, V-funnel test and L-box test. By selecting the (w/c) ratios in the range of 0.30 to 0.60, the compressive and bond strength of specimens were tested with 100 and 150 mm cube specimens after 3, 7, 28 and 56 days starting from the setting of concrete, whereas for comparison, the specimens of normal concrete (NC) were cast by conventional practice with substantial compaction and vibration in similar condition.Results showed that Workability and selfcompactibility of SCC specimens increase with increasing of superplasticizer amount, but the relation between them is not linear. The behavior of compressive strength and bond strength of SCC and NC are different. At the ages of 3 and 7 days, the compressive and bond strength of SCC specimens are lower than SCC specimens, while at the ages of 28 and 56 days, the compressive and bond strengths of SCC specimens are higher than NC specimens. An intersection point is happened around the ages of 21-23 days. Bond strength of deformed bars embedded in SCC specimens is more than NC specimens. The correlation between bond strength and compressive strength in NC is more than SCC, but the strength saturation in SCC samples is longer than NC.Some pictures of test results are shown, and examples from projects around the world which have been constructed by using SCC are introduced with this idea, to replace the SCC instead of NC in construction of important projects in our country.
TOPICAL NAME USED AS SUBJECT
Self-compacting concrete
workability
superplasticizer,selfcompactibility
bond strength
PERSONAL NAME - PRIMARY RESPONSIBILITY
فروغی اصل، علی
PERSONAL NAME - SECONDARY RESPONSIBILITY
دیلمقانی، صمد، استاد راهنما
ارمغانی، ارسطو، استاد راهنما
فامیلی، هرمز، استاد مشاور
ELECTRONIC LOCATION AND ACCESS
Public note
سیاه و سفید
نمایه‌سازی قبلی
