کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
830500 1470355 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessing the effect of biomass ashes with different finenesses on the compressive strength of blended cement paste
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Assessing the effect of biomass ashes with different finenesses on the compressive strength of blended cement paste
چکیده انگلیسی

This study assesses the effect of biomass ashes with different finenesses on the compressive strength of blended cement paste. rice husk ash (RHA), palm oil fuel ash (POFA) and river sand (RS) were ground to obtain two finenesses: one was the same size as the cement, and the other was smaller than the cement. Type I Portland cement was replaced by RHA, POFA and RS at 0%, 10%, 20%, 30% and 40% by weight of binder. A water to binder ratio (W/B) of 0.35 was used for all blended cement paste mixes. The percentages of amorphous materials and the compressive strength of the pastes due to the hydration reaction, filler effect and pozzolanic reaction were investigated. The results showed that ground rice husk ash and ground palm oil fuel ash were composed of amorphous silica material. The compressive strength of the pastes due to the hydration reaction decreased with decreasing cement content. The compressive strength of the pastes due to the filler effect increased with increasing cement replacement. The compressive strengths of the pastes due to the pozzolanic reaction were nonlinear and were fit with nonlinear isotherms that increased with increasing fineness of RHA and POFA, cement replacement rate and age of the paste. In addition, the model that was proposed to predict the percentage compressive strength of the blended cement pastes on the basis of the age of the paste and the percentage replacement with biomass ash was in good agreement with the experimental results. The optimum replacement level of rice husk ash and palm oil fuel ash in pastes was 30% by weight of binder; this replacement percentage resulted in good compressive strengths.


► Percentage compressive strength of pastes due to filler effect were a logarithmic.
► Percentage compressive strength due to pozzolanic reaction is explicitly nonlinear.
► Percentage compressive strength due to pozzolanic had more than filler effect.
► The optimum replacement level of RHA and POFA in pastes was 30% by weight of binder.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 42, December 2012, Pages 424–433
نویسندگان
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