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نوع فایل :  .ppt ( قابل ویرایش و آماده پرینت )

تعداد اسلاید : 59 اسلاید

 قسمتی از متن .ppt : 

Supplementary Cementing Materials

Introduction

Fly ash, ground granulated blast-furnace slag, silica fume, and natural pozzolans, such as calcined shale, calcined clay or metakaolin, are materials that, when used in conjunction with Portland or blended cement, contribute to the properties of the hardened concrete through hydraulic or pozzolanic activity or both. These materials are also generally categorized as supplementary cementing materials (SCM's) or mineral admixtures.

A pozzolan: is a siliceous or alumino-siliceous material that, in finely divided form and in the presence of moisture, chemically reacts with the calcium hydroxide released by the hydration of Portland cement to form calcium silicate hydrate and other cementing compounds.