الفهرس 
CHAPTER I : INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Sewage sludge produced from waste water treatment process have been used in Egypt as fertilizer despite of that it contains hazardous microorganisms and toxic heavy metals which increase its release in the environment causing serious pollution problems. In Egypt, there are huge quantities of silica fume found as waste material during the manufacture of ferrosilicon alloys in Edfo, Aswan. These waste materials make environmental disposal problems. Hence there is current interest in this work to investigate the suitability of using silica fume in combination with sewage sludge ash to improve the fire resistance of ordinary Portland cement paste. The use of sewage sludge ash as alternative cementitious material to improve the fire resistance of cement paste not only marks a novelty in cement technology but also assists in alleviating disposal problem of sewage sludge heaps in Egypt. The thesis was divided into four chapters as following:
1- Chapter I is the introduction which summarizes the following items; properties of ordinary Portland cement, treatment of sewage and sewage sludge, the potential of sewage sludge treatment in EGYPT and silica fume.
2- Chapter II follows up the literature survey which collects the conclusions of large numerous recent research articles dealing with the utilization methods of sewage sludge, pozzolanic activity of sewage sludge ash, fire resistance of cement paste and the aim ofthe work.
3- Chapter III includes the experimental techniques which discuses in details the origin of selected raw materials, thermal treatment of sewage sludge, proposed mix compositions of blended cements containing sewage sludge ash and silica fume, preparation of hydrated cement paste as well as different laboratory and instrumental techniques used in this investigation.
4- Chapter IV includes the results and discussion which was subdivided into four parts:
A- Part 1: Characterization of raw materials by XRF, XRD, TGA, FTiR and SEM techniques.
B- Part II: Calcinations and pozzolanic activity of sewage sludge ash by XRD, TGA, FTIR and SEM techniques.
C- Part III: Hydration characteristics of sewage sludge ash and silica fume blended cement pastes by combined water content, bulk density, total porosity and compressive strength and the hydration products by the aid ofXRD, TGA, FTiR and SEM techniques.
D- Part IV: Fire resistance of sewage sludge ash and silica fume blended cement pastes by weight loss, bulk density, total porosity, compressive strength as well as visual inspection. The mineralogical composition of some selected samples was investigated by XRD and SEM techniques.