Natural pozzolana and its uses in concrete

مقدم أطروحة جامعية

al-Doori, Saba Qays Ibrahim

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2000

الملخص الإنجليزي

Natural pozzolan has been in use for many centuries.

When mixed with lime, they have provided cement for long lasting and spectacular construction.

Since the mid-sixties, utilization in the USA and elsewhere has been overshadowed by the increasing popularity of fly ash, mainly due to cost.

Many developing countries, however, have turned to pozzolan, when available, to supplement of ten insufficient Portland cement supplies.

This research review the types and behavior of natural pozzolan, the behavior of hydrated cement, the Portland cement pozzolan-water reaction and the relationship between the lime- pozzolan reaction and the mechanical properties of the cement.

It is recognized "that the reaction is "Influenced by the" chemical and mineral composition of both the pozzolan and the-element, their relative finesses, conditions of" admixtures"Many of literature indicate that most elements of modern concrete technology, and in particular, the use of chemical admixtures and polymer impregnation, have included portioned-pozzolan cements in their scope.

Apart from reducing cost, compared to plain Portland cement concrete, the benefits of Portland-pozzolan blends are essentially associated with improvements in durability, reducing permeability and in particular, resistance to sulfate attack and a reduction in the effects of the alkali-aggregate reaction.

This research concludes by indicating some of the factors involved in developing natural.

التخصصات الرئيسية

الهندسة المدنية

الموضوعات

• الخرسانة

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-306245