A Numerical Approach to Estimate the Tensile Strength of Structural Lightweight Concrete

Abstract

Since lightweight concrete has many advantages over traditional concrete, it is of great importance for the building industry to investigate more and examine its mechanical properties. It is considered that it will be very useful to use lightweight concretes in special concrete class if they have sufficient strength properties. Structural lightweight concrete can be produced from different lightweight aggregates. Expanded clay aggregate, which is one of them, is thought to have an important place in the production of structural light concrete with its high reserve and easy availability. At the same time, structural lightweight concrete can improve the properties of structures such as earthquake resistance and thermal insulation. The aim of this study; a series of concrete specimens produced with different mixing ratios containing lightweight expanded clay aggregate is to develop a numerical model using the tensile strength test results in the literature. For this purpose, the studies on structural lightweight concrete have been investigated in detail in the literature. With this numerical model, it is hoped that the tensile strength can be easily calculated depending on the content of cement, aggregate, powder/filler, silica fume, water, lightweight expanded clay aggregate and super plasticizer. In this context, the parameters affecting tensile strength were determined. The effects of these parameters on tensile strength were interpreted with related graphics. In the numerical model developed in this study, tensile strength affected by the related parameters is included as output. As a result; with the numerical model developed using nonlinear statistical analysis, it is planned to develop a practical equation with high precision that can be easily used by application engineers.

Keywords

• structural lightweight concrete,tensile strength

Yapısal Hafif Betonun Çekme Dayanımına Sayısal Bir Yaklaşım

Abstract

Hafif betonun geleneksel betona göre birçok avantajı olduğundan dolayı daha çok araştırılması ve mekanik özelliklerinin incelenmesi inşaat sektörü açısından büyük bir önem taşımaktadır. Özel beton sınıfına giren hafif betonların yeterli dayanım özelliklerine sahip olması durumunda, yapılarda kullanımının çok faydalı olacağı düşünülmektedir. Yapısal hafif beton, farklı hafif agregalardan imal edilebilmektedir. Bunlardan biri olan genleştirilmiş kil agregasının (LECA), rezervinin çok fazla olması ve kolay elde edilebilirliği ile yapısal hafif beton üretiminde önemli bir yere sahip olduğu düşünülmektedir. Aynı zamanda yapısal hafif beton ile yapıların, depreme karşı dayanıklılık ve ısı yalıtımı gibi özelliklerinin de iyileştirilmesi sağlanabilmektedir. Bu çalışmanın amacı; LECA içeren farklı karışım oranları ile üretilen bir dizi beton numunenin, literatürdeki çekme dayanımı deney sonuçları kullanarak sayısal bir model geliştirmektir. Bu amaçla literatürde yapısal hafif beton üzerine yapılan çalışmalar detaylı bir şekilde incelenmiştir. Geliştirilen bu model ile çimento, agrega, bağlayıcı, silis dumanı, su, LECA ve katkı içeriğine bağlı olarak çekme dayanımının kolayca hesaplanabileceği umut edilmektedir. Bu kapsamda, çekme dayanımını etkileyen parametreler belirlenmiştir. Bu parametrelerin çekme dayanımına etkileri ilgili grafiklerle yorumlanmıştır. Bu çalışmada geliştirilen sayısal modelde, ilgili parametrelerin etkilediği çekme dayanımı çıktı olarak yer almaktadır. Sonuç olarak; doğrusal olmayan istatistiksel analiz kullanılarak geliştirilen sayısal model ile uygulama mühendisleri tarafından kolaylıkla kullanılabilecek pratik ve yüksek hassasiyetli denklem geliştirilmesi planlanmıştır. 

Keywords

• yapısal hafif beton

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