کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
256739 503561 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pumice powder as filler of self-compacting concrete
ترجمه فارسی عنوان
پودر پومیز به عنوان پرکننده بتن خود فشرده
کلمات کلیدی
بتن خود فشرده، پرکننده، پومیس، رئولوژی بتنی، ویژگی های مکانیکی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• Pumice powder is introduced in self-compacting concrete mixtures as filler additive.
• Properties of SCC with pumice at fresh state and rheological model are investigated.
• Influence of pumice powder on SCC is compared to other fillers.
• Mechanical properties of SCC with filler of pumice are compared to other mixtures.
• Pumice pozzolanicity is verified to improve the mechanical behaviour of SCC.

An experimental study on the rheological and mechanical properties of self-compacting concrete with pumice powder used as filler additive is presented. Self-compacting concrete (SCC) shows its peculiar characteristics in the fresh state and many researches have been developed with reference to its rheological characteristics paying attention to the techniques of self-compacting properties assessment. One of the most important aspect in concrete mix-design is the type and the amount of fillers with respect to water and cement: this amount has great influence not only on self-compacting properties (fluidity, segregation, etc.), but also on the mechanical properties of the mixture. Volcanic materials like white pumice have pozzolanic properties, so that it is possible to use powdered pumice in SCC manufacturing with a double effect: on one hand as filler and on another hand as a pozzolanic element in the mixture. The experimental campaign investigates SCC properties when white pumice powder is used as filler with or instead of silica fumes or flying ashes. From the rheological model of the paste, varying the components of the mixture, the determination of pumice powder amount and the consequences on the rheological properties of SCC are investigated. SCC with pumice powder is compared to other mixtures with silica fume and marble powder as filler, through tests on fresh and hardened concrete. Compressive and tensile strength tests were carried out together with the evaluation of fracture energy with the aim of characterizing the constitutive law of SCC with pumice powder. Results from shrinkage tests in the first days of curing are reported and comparisons with ordinary concrete manufactured with the same basic components are shown in order to evaluate the suitability and effectiveness of pumice powder added as filler to self-compacting concrete mix-design. Pozzolanicity of pumice strictly influences the mechanical properties with a significant increase of compressive strength after 28 days of curing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 96, 15 October 2015, Pages 581–590
نویسندگان
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