Author: Paul D. Tennis, Michael L. Leming, and David J. Akers | Size: 1 MB | Format:PDF | Publisher: PCA | Year: 2004 | pages: 32 | ISBN: 0893122424
Pervious concrete pavement is a unique and effective means to meet growing environmental demands. By capturing rainwater and allowing it to seep into the ground, pervious concrete is instrumental in recharging groundwater, reducing stormwater runoff, and meeting U.S. Environmental Protection Agency (EPA) stormwater regulations. In fact, the use of pervious concrete is among the Best Management Practices (BMP) recommended by the EPA— and by other agencies and geotechnical engineers across the country—for the management of stormwater runoff on a regional and local basis. This pavement technology creates more efficient land use by eliminating the need for retention ponds, swales, and other stormwater management devices. In doing so, pervious concrete has the ability to lower overall project costs on a first-cost basis. In pervious concrete, carefully controlled amounts of water and cementitious materials are used to create a paste that forms a thick coating around aggregate particles. A pervious concrete mixture contains little or no sand, creating a substantial void content. Using sufficient paste to coat and bind the aggregate particles together creates a system of highly permeable, interconnected voids that drains quickly. Typically, between 15% and 25% voids are achieved in the hardened concrete, and flow rates for water through pervious concrete typically are around 480 in./hr (0.34 cm/s, which is 5 gal/ft2/ min or 200 L /m2/min), although they can be much higher. Both the low mortar content and high porosity also reduce strength compared to conventional concrete mixtures, but sufficient strength for many applications is readily achieved. While pervious concrete can be used for a surprising number of applications, its primary use is in pavement. This report will focus on the pavement applications of the material, which also has been referred to as porous concrete, permeable concrete, no-fines concrete, gap-graded concrete, and enhanced-porosity concrete.
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Temporary Structures-Horizontal Formwork Design and Formwork Design Tables
Author: Professor Kamran M. Nemati | Size: 632 KB | Format:PDF | Publisher: UNIVERSITY OF WASHINGTON, DEPARTMENT OF CONSTRUCTION MANAGEMENT | Year: 2007 | pages: 17
This lesson provides an overview on the basic structural wood design as it applies to concrete formwork. This lesson covers materials, methods and techniques associated with concrete formwork design and construction for slabs. This lesson intends to provide enough information to be able to design horizontal forms, which will be covered in step-by-step fashion in lesson 2. Also in this lesson, the use of design tables will be discusses. The design tables are used for preliminary design when rigorous structural analysis is required for formwork design.
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This book is useful for quick reference for formulae and constants.
The book contains
SI Multiples
Basic Units (distance, area, volume, mass, density)
Mathematical Formulae
Applied Mechanics
Thermodynamics
Fluid Mechanics
Electricity
Periodic Table
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Abstract
Provides large scale indicative drawings of thermal insulation and airtightness provisions for timber frame interfaces. The details are accompanied by comments and checklists to assist in achieving compliance at various stages throughout construction.
History
See also introductory document, 'Accredited construction details'. Other indicative detail drawings are available for steel frame details, masonry cavity wall insulation details, masonry external wall insulation details and masonry internal wall insulation details.
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Abstract
Provides large scale indicative drawings of thermal insulation and airtightness provisions for steel frame interfaces. The details are accompanied by comments and checklists to assist in achieving compliance at various stages throughout construction.
History
See also introductory document, 'Accredited construction details'. Other indicative detail drawings are available for timber frame details, masonry cavity wall insulation detail, masonry internal wall insulation details and masonry external wall insulation details
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