Flexural behavior and cracking resistance of jute-fiber ropes reinforced lightweight thin cementitious composite

العناوين الأخرى

تصرف الانحناء و مقاومة الشقوق للتراكيب الإسمنتية الخفيفة المسلحة بحبال من ألياف الجوت

مقدم أطروحة جامعية

Habib, Karzan Muhammad Sadiq

مشرف أطروحة جامعية

Amin, Dilshad Khidr Hamad

أعضاء اللجنة

Jaff, Dilshad Kakasor
Yukhanna, Kanan Sliwa
Yusuf, Ali Ramadan

الجامعة

جامعة صلاح الدين

الكلية

كلية الهندسة

القسم الأكاديمي

قسم الهندسة المدنية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2011

الملخص الإنجليزي

The development and construction of Natural Fibers Reinforced Lightweight Cementitious Composite Elements in building construction is a growing trend in construction industry all over the world due to its high strength-to-weight ratio, reduced weight, and good thermal insulation characteristics.

The objective of this study is to evaluate post-cracking behavior of continuous jute fiber reinforced cementitious composite.

In particular, it focused on the influential controlling toughness behavior and the variability associated with it.

The key parameters considered include : the stress and strain at first cracking, the stress and strain at maximum post-cracking, the multiple cracking process, the stress versus deflection (σ-ε) and moment-curvature behavior, the energy associated with the multiple cracking process, the stress versus crack opening, response of a single crack and the crack spacing.

The main variables covered were; jute fiber volume fraction ranging from 0 % to 8 %) reinforced in different layers ( 1 to 4 layers) , ratio of normal fine aggregate to lightweight fine aggregate which means change in compressive strength and unit weight.

In this study, six member groups were cast, each group with five specimens (25mm x 150mm x 600 mm) in dimensions and reinforced with jute fiber ropes from 15 to 60 wires for each group, and with water cement ratio of 0.4 for all mixes.

The two most common methods were used to determine flexural toughness based on ASTM Cl0l8 and JSCE SF-4.

The results of testing members under fourpoint loading showed that the first crack load was about 29 % of ultimate failure load, the increment percentage of first crack load and ultimate load ranged from (6 % to 24 %) and (10 % to 46 %) respectively in response to the increment of fiber volume fraction.

The mix proportion (1 : 1 : 1) of (Cement: Normal fine aggregate : Lightweight fine aggregate) with 8 % jute fiber volume fraction showed highest number of cracks (25) cracks with crack spacing 16.2mm).

The modulus of rupture up to 18.4 N / mm2 was obtained, and Krenchel Equation showed very good results to predict crack spacing.

The toughness measured according to ASTM seemed to reflect the true toughness properties quite well than single value toughness by JSCE method.

التخصصات الرئيسية

الهندسة المدنية

الموضوعات

• الخرسانة
• الخصائص الميكانيكية
• التكسير(الكيمياء)

عدد الصفحات

101

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-310624