منابع مشابه
Preparation and properties of porous aerated concrete
INTRODUCTION Porous concrete, especially Aerated Autoclaved Concrete (AAC) was first developed by a Swedish engineer between the years 1920 and 1932 [1]. He was searching for a material with the properties of wood, but without the disadvantages of wood. Near the end of World War II, AAC became widely used. Vast areas of cities and industries lay in waste and tremendous rebuilding became necessa...
متن کاملImproving the Performance of Porous Concrete Composites Using Zeolite as a Coarse Grain
Porous concrete is a mixture of cement and water that may contain fine grains, which play a role in water transfer and permeability. Porous concrete can act as a drain to pass rainwater and recharge groundwater. In this study, 25%, 50%, 75%, and 100% zeolite were used to replace the coarse aggregates in porous concrete. The effects of the zeolite on the compressive strength, permeability coeffi...
متن کاملA model for reactive porous transport during re-wetting of hardened concrete
A mathematical model is developed that captures the transport of liquid water in hardened concrete, as well as the chemical reactions that occur between the imbibed water and the residual calcium silicate compounds residing in the porous concrete matrix. The main hypothesis in this model is that the reaction product – calcium silicate hydrate gel – clogs the pores within the concrete thereby hi...
متن کاملساخت و مشخصه یابی حسگر رطوبت خازنی مبتنی بر ساختار al/al2o3 porous/ag porous
رطوبت از جمله مهمترین کمیت هایی است که باید مقدار دقیق آن در بسیاری از محیط ها اندازه گیری و کنترل شود. اندازه گیری و کنترل رطوبت در بسیاری از کاربردها مانند ساخت تولیدات حساس به رطوبت، مخازن نگهداری، اتاق های کامپیوتر، مدیریت انرژی، بیمارستان ها، موزه ها، صنایع نساجی، پزشکی، کشاورزی و کتابخانه ها اهمیت زیادی پیدا کرده است. انواع مختلفی از حسگرهای رطوبت بر اساس سازوکارهای حسگری مقاومتی، خازنی، ...
Concrete Transitions
Following von Wright, “transitions” are needed for understanding agency. I indicate how von Wright’s account of transitions should be adapted to take account of objective indeterminism, using the idea of branching space-time. The essential point is the need to locate transitions not merely in space-time, but concretely amid the indeterministic, causally structured possibilities of our (only) wo...
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ژورنال
عنوان ژورنال: Concrete Journal
سال: 2016
ISSN: 0387-1061,2186-2753
DOI: 10.3151/coj.54.5_542