کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
830732 1470360 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Establishment of the durability indices for cement-based composite containing supplementary cementitious materials
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Establishment of the durability indices for cement-based composite containing supplementary cementitious materials
چکیده انگلیسی

The present study aimed to establish the durability indices of cement-based composites containing supplementary cementitious materials. The influences of compressive strength, permeability, and microstructure of cement-based composites containing fly ash and silica fume were discussed. The relationship between pore structure and corrosion behavior was investigated and compared.The results demonstrate that the addition of silica fume in cement-based composites resulted in a higher compressive strength, a lower absorption, a lower critical pore size, a lower chloride diffusion coefficient, and a lower corrosion rate. The composites containing 10% silica fumes performed better in permeability than composites containing 5% silica fumes, because silica fumes can narrow down the size of large capillary pores and densify the pore structure. The addition of fly ash in composites also enhanced the compressive strength and the permeability but was not as effective as silica fume. Unhydrated fly ash grains caused a looser pore structure and reduced the permeability. The combination of fly ash and silica fume enhanced the compressive strength and the permeability and specimens containing 5% silica fume and 10% fly ash had increased more in compressive strength and decreased more in permeability than specimens containing 5% silica fume or 15% fly ash. Moreover, the corrosion rate, the chloride diffusion coefficient, and the critical pore size were suitable for evaluating the durability of cement-based composites. A regression analysis found that the probability of rebar corrosion was greater than 90%, when the corrosion rate was 11.54 μm/yr, the chloride diffusion coefficient was 0.62 × 10−12 m2/s, or the critical pore size was 26.71 nm.


► Experimental study is established the durability indices of cement-based composites.
► Different mixes containing fly ash and silica fume proportions have been tested.
► The influence of different mixes on the strength and durability has been discussed.
► The durability is included absorption, chloride diffusion and corrosion.
► The relationship between pore size and durability is established.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 37, May 2012, Pages 28–39
نویسندگان
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