کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6722890 503592 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of placement characteristics on SCC lateral pressure variations
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Effect of placement characteristics on SCC lateral pressure variations
چکیده انگلیسی
Lateral pressure exerted by fresh concrete on vertical formwork systems controls significantly the design of the formwork systems. Several factors including, material properties, placement conditions, and formwork characteristics can affect formwork lateral pressure. This paper presents the results of an extensive experimental work aimed at studying the influence of concrete temperature (10-32 °C), casting depth (up to 13 m), placement rate (2-30 m/h), waiting period between successive lifts, as well as concrete thixotropy on lateral pressure characteristics. The increase of concrete temperature is shown to accelerate the stiffening rate of the concrete leading to reduction in initial lateral pressure. For highly thixotropic SCC mixture even at very high casting rate of 30 m/h, the initial lateral pressure is limited to 26% of the equivalent hydrostatic pressure at casting depth of 10 m and to 70% at the shallow casting depth of 3 m. These pressure values can drop further (about 25%) when the casting rate reduces from 30 to 2 m/h. Interruption of concrete casting with a waiting period of 30 min can reduce lateral pressure up to 15%, especially for highly thixotropic concrete.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 66, 15 September 2014, Pages 507-514
نویسندگان
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