بررسی اثر نوع الیاف بر خواص بتن پودری واکنش‌پذیر

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه صنعتی سهند

2 دانشکده مهندسی عمران، دانشگاه صنعتی سهند، تبریز

چکیده

بتن پودری واکنش­پذیر (RPC) که در زمره بتن­های فوق توانمند (UHPC) قرار دارد دارای مقاومت فشاری زیاد، مقاومت خمشی و شکل­پذیری قابل ملاحظه، نفوذپذیری کم و دوام بسیار بالا می­باشد. به کار بردن الیاف در بتن RPC نقش اساسی در افزایش مقاومت خمشی و شکل­پذیری آن دارد؛ به طوری که در برخی موارد مقاومت خمشی آن حتی به MPa 40 نیز رسیده است. در این تحقیق که در آزمایشگاه بتن دانشگاه صنعتی سهند تبریز انجام شده است، تأثیر به کار بردن سه نوع الیاف شامل الیاف کربن ریز و دو نوع الیاف فولادی قلاب­دار بلند و مستقیم کوتاه بر خواص بتن پودری واکنش­پذیر مورد مطالعه قرار گرفته است و اثر این الیاف بر مقاومت فشاری، مقاومت کششی خمشی و چقرمگی و یا ظرفیت جذب انرژی کرنشی کل آن بررسی شده است. نتایج بیانگر آن هستند که افزودن الیاف فولادی به بتن RPC، بیشترین تأثیر را بر مقاومت فشاری و کششی خمشی آن دارد. الیاف فولادی قلاب­دار، تقریباً %10 و الیاف فولادی کوتاه، حدود %9، مقاومت فشاری را افزایش دادند. در این میان، تأثیر الیاف فولادی قلاب­دار بر مقاومت کششی خمشی و ظرفیت جذب انرژی کرنشی کل، قابل ملاحظه­تر می­باشد. افزودن الیاف کربن سبب کاهش اندکی در مقاومت فشاری و کششی خمشی بتن RPC شد؛ ولی ظرفیت جذب انرژی کل آن را تا حدی بهبود بخشید.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation into the Effects of Fibers Type on the Properties of Reactive Powder Concrete

نویسندگان [English]

  • Leila Meraji 1
  • Hassan Afshin 2
  • Karim Abedi 2
1 Faculty of Civil Engineering, Sahand University of Technology
2 Faculty of Civil Engineering, Sahand University of Technology
چکیده [English]

In recent years, due to the progress in the field of concrete technology, some types of high-performance concrete and ultra-high-performance concrete have been developed. Reactive powder concrete (RPC), as a new type of ultra-high-performance concrete, was first patented by a French construction company in 1994. The superior properties of RPC such as high compressive strength (more than 150 MPa), high packing density, very low permeability and higher durability are achieved by eliminating the coarse aggregates and substituting them with fine silica sand aggregates, using high amount of silica fume and low water to cement ratio. Steel fibers are another materials used in RPC. The results of researches show that fibers have the main effect on the increasing of flexural strength, ductility and energy absorption, as in some cases, RPC’s flexural strength has been reached up to 40 MPa [1].

کلیدواژه‌ها [English]

  • Reactive powder concrete
  • Fibers
  • compressive strength
  • Flexural strength
  • Energy absorption capacity
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