کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4911589 1428459 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparison between the falling head and the constant head permeability tests to assess the permeability coefficient of sustainable Pervious Concretes
ترجمه فارسی عنوان
مقایسه بین سقوط سر و آزمون نفوذپذیذ ثابت برای ارزیابی ضریب نفوذپذیری بتنهای پایدار
کلمات کلیدی
بتن پیش ساخته، نفوذپذیری، قطر بینی، آزمون افتادن نفوذ پذیری سر، آزمون نفوذ پذیری پای ثابت
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


- The falling head permeability test has a high dispersion and is not sensitive to changes in porosity.
- The minimum number of repetitions is established for each type of test.
- The constant head permeability test is a viable and economical alternative to measure the permeability of the material.
- The experimental results showed a direct relationship between the porosity and the permeability as expected.

The use of Pervious Concrete (PC) increased in the last years as an alternative to solve the run-off problem. PC shows a high percentage of empty spaces/gaps, which vary from 10 to 35%, facilitating the flow of rain and water through its structure. PC presents higher k permeability coefficient compared to conventional concrete. Permeability is the main property of PC, although there is no standardized method that guarantees the correct and precise measurement of such property in laboratory conditions. Currently, two main methodologies are used to assess the permeability coefficient: the falling head and the constant head permeability tests. In that regard, the American Concrete Institute recommends the use of the first method, although no comparison was done between them. Furthermore, the recommendations do not consider the use of sustainable aggregates during the production of the PC. In this study, the permeability tests were explained and used to assess the permeability coefficient of different mixes of PC produced with sustainable aggregates. The experimental results were used to analyze the relationship between the porosity and the permeability of concrete and compare the performance of the falling head and constant head permeability tests. The study presents the advantages of performing the constant head permeability test to assess the permeability of the PC.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Case Studies in Construction Materials - Volume 7, December 2017, Pages 317-328
نویسندگان
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