DESIGN OPTIMIZATION AND STATISTICAL MODELING OF COMPRESSIVE STRTENGTH OF CEMENT MORTARS CONTAINING RECYCLED WASTE BRICK DUST USING RESPONSE SURFACE METHODOLOGY

Abstract

Brick dust is a waste material with pozzolanic nature. It is important to recycle this waste material without causing environmental pollution. In this study, it was aimed to evaluate the usability of waste brick dust (WBD) in cement in terms of 7 and 28-day compressive strength performance. For this purpose, WBD was added as a replacement for Portland cement (CEM I 52.5 N) in amounts of 0%, 2.5%, 5%, 7.5% and 10% by weight in accordance with TS EN 197-1 and compressive strength test was conducted. Based on the experimental results, surface response methodology (RSM) analysis was performed in order to estimate the 7 and 28-day compressive strengths of WBD-substituted cement mortar with the help of statistical model. The results showed that increasing the pozzolanic additive (WBD) caused a decrease in mechanical strength at 7 and 28 days (short and medium term). At a 95 % level of confidence, the effect of multiple factors on the target response was studied using statistical analysis of analysis of variance (ANOVA) results. The coefficient of determination (R2) value obtained as 0.99 show the reliability and performance of the proposed model. As a result of optimization, the optimal response value for compressive strength was found to be 60.57 MPa and the desirability value was found to be 1. In this study, it was concluded that the optimization performed using RSM is an effective approach for the mixed design of cements.

Keywords

• Waste
• compressive strength
• optimization
• brick dust
• response surface methodology (RSM)

GERİ DÖNÜŞTÜRÜLMÜŞ ATIK TUĞLA TOZU İÇEREN ÇİMENTO HARÇLARININ BASINÇ DAYANIMININ TEPKİ YÜZEYİ METODOLOJİSİ KULLANILARAK TASARIM OPTİMİZASYONU VE İSTATİSTİKSEL MODELLEMESİ

Abstract

Tuğla tozu puzolanik özellik gösteren atık bir malzemedir. Bu atık malzemenin çevre kirliliğine neden olmadan geri kazanımı önem arz etmektedir. Bu çalışmada atık tuğla tozunun çimento içerisinde kullanılabilirliğinin 28 günlük basınç dayanımı performansı açısından değerlendirilmesi amaçlanmıştır. Bu amaçla atık tuğla tozu (ATT), TS EN 197-1 standardına uygun olarak ağırlıkça %0, %2.5, %5, %7.5 ve %10 oranlarında Portland çimento (CEM I 52.5 N) yerine ikame edilmiş ve basınç dayanımı deneyleri gerçekleştirilmiştir. Deneysel sonuçlara dayalı olarak ATT ikameli çimento harcının 7 ve 28 günlük basınç dayanımlarını istatistiksel model yardımıyla tahmin etmek amacıyla yanıt yüzey metodolojisi (YYM) analizi yapılmıştır. Sonuçlar, puzolanik katkının (ATT) artmasının, 7 ve 28 günde (kısa ve orta vadede) mekanik dayanımda azalmaya neden olduğunu göstermiştir. %95'lik bir güven seviyesinde, birden fazla faktörün hedef yanıt üzerindeki etkisi, varyans analiz (ANOVA) sonuçlarının istatistiksel analizi kullanılarak incelenmiştir. 0,99 olarak elde edilen belirleme katsayısı (R2) değeri, önerilen modelin güvenilirliğini ve performansını göstermektedir. Optimizasyon sonucunda basınç dayanımı için optimal yanıt değeri, 60.57 MPa ve istenirlik değeri 1 olarak bulunmuştur. Bu çalışmada, YYM kullanılarak yapılan optimizasyonun çimentoların karma tasarımı için etkili bir yaklaşım olduğu sonucuna varılmıştır.

Keywords

• Atık
• basınç dayanımı
• optimizasyon
• tuğla tozu
• yanıt yüzey metodolojisi (YYM)

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