منابع مشابه
Recycled Materials in Portland Cement Concrete
.............................................................................................................................1 Wastes and By-Products for Use in Portland Cement Concrete.....................................2 RESEARCH OBJECTIVES ....................................................................................................3 LITERATURE SURVEY.....................................
متن کاملMTA versus Portland cement: review of literature
Introduction: Both Mineral Trioxide Aggregate (MTA) and Portland cement (PC) have been highlighted because of their favorable biological properties, with extensive applications in Endodontics, including the possibility of using into root canal filling. Objective: This article reviews literature related to MTA and PC comparing their physical, chemical and biological properties, as well as their ...
متن کاملDrying Shrinkage Mechanisms in Portland Cement Paste
The shrinkage mechanisms of portland cement paste were investigated from shrinkage, weight loss, and pore structure measurements using nitrogen sorption and mercury intrusion porosimetry (MIP). Thin samples (2.3 mm) of well-hydrated (165 d) pastes of 0.4 and 0.6 water-to-cement (W/C) ratios were dried directly from saturated surface dry state to 75%, SO%, 11%, and 0% relative humidity (rh). Fro...
متن کاملIce nucleation by ordinary Portland cement
Portland cement was studied for its nucleating ability by the freezing behaviour exhibited of drops produced from aqueous suspension of Portland cement vis-a-vis of drops produced from suspensions of AgI, 2AgI.NaI and PbI,. I t is revealing to note that, at temperature colder than 5"C, Portland cement is as potent an ice nucleant as is either 2AgIaNaI or PbI,. At temperatures approaching 5"C, P...
متن کاملEffects of Exposure to Portland Cement Dust on Lung Function in Portland Cement Factory Workers in Khash, Iran
The present study was done to assess cement dust exposure and its relationship to respiratory health effects, both acute and chronic respiratory symptoms and ventilatory function impairment among Portland cement factory workers in Khash located in the south part of Iran. A cross-sectional study was conducted at Khash Portland cement producing factory in Iran in 2001. A total of 170 exposed and ...
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ژورنال
عنوان ژورنال: Nature
سال: 1912
ISSN: 0028-0836,1476-4687
DOI: 10.1038/089177a0