ACI 306R-10: Guide to Cold Weather Concreting - download pdf or read online


ISBN-10: 0870313975

ISBN-13: 9780870313974

The ambitions of chilly climate concreting practices are to avoid harm to concrete because of freezing at early a while, make sure that the concrete develops the necessary power for secure elimination of varieties, keep curing stipulations that foster general power improvement, restrict fast temperature alterations, and supply security in keeping with the meant serviceability of the structure.

Concrete put in the course of chilly climate will advance adequate power and sturdiness to meet meant provider requisites while it's correctly produced, put, and guarded. This advisor offers info for the contractor to pick the simplest ways to fulfill the minimal chilly climate concreting requirements.

This consultant discusses: concrete temperature in the course of blending and putting, temperature loss in the course of supply, training for chilly climate concreting, security specifications for concrete that doesn't require development helps, estimating energy improvement, tools of security, curing specifications, and admixtures for accelerating environment and power achieve together with antifreeze admixtures. The fabrics, strategies, quality controls measures, and inspections defined during this rfile could be proven, monitored, or played as appropriate simply by way of contributors conserving the fitting ACI Certifications or identical.

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Additional resources for ACI 306R-10: Guide to Cold Weather Concreting

Example text

Frost crysta ls growing on windows devel o " p feathery pat­ terns as the primary frost me lts and recrysta l l izes. 28 Drainage pattern af the United States and Canada. Rain either is stored i n the ground, po n ds, o r la kes, o r runs off to b e stored i n the ocea n . It eventua l ly evaporates i nto the a i r again. S u rface runoff o f preci pitation a n d the u n dergro u n d fl o w o f wate r g ive us o u r brooks, streams, a n d rivers. Rivers a lways flow from higher to lower levels, c utting their own va l l eys.

If spri n g is late, the melting wi l l be m o re sudden, resulting i n floods. WAT E R STO RAG E Topsoil h o l ds a n i m mense amount of water. Some of this is tra nsferred into the a i r by g reen plants. But most of it seeps through soil a n d porous rock until it reaches non porous clay o r rock. I t forms a m assive subterra n ea n reservoir, fi l l i n g a l l the cracks a n d pores i n t h e rock a n d soi l . T h e u n derground water, l ike surface water, fl ows down h i l l and seeps out into strea m s or comes out in springs.

More energy is dif­ fus � d by the atmosphere a n d less reaches the earth to warm it. winter sun solar radiation under a cloudless sky temperature average SEASONAL LAG Aug ust is hotter than J u n e even though the sun is more n early overhead and the day is longest on June 22. I n terms of so lar radiation reaching the earth, May, J une, a n d J u ly shou l d be our warm est months. But J une, Ju ly, and August actu a l l y a re. Why? During the yea r the earth, as a whole, l oses precisely the same amount of heat it receives from the sun.

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