Vermikülitin katkı maddesi olarak kullanıldığı geçirgen betonun performans analizi

Öz

Geçirimli beton, suyu emme ve yüzey akışını azaltma kabiliyetiyle bilinir, ancak genellikle düşük basınç dayanımından muzdariptir. Bu sınırlamayı gidermek için bu çalışma, beton dayanımını artırma potansiyeline sahip bir katkı malzemesi olarak vermikülitin dahil edilmesini araştırmaktadır. Araştırmanın amacı, değişen vermikülit içeriğinin geçirimli betonun basınç dayanımı, gözenekliliği ve geçirgenliği üzerindeki etkisini analiz etmektir. Laboratuvar testleri, toplam agrega ağırlığının %0, %5, %10 ve %15'i oranında vermikülit kullanılarak gerçekleştirilmiştir. Silindirik numuneler (15x30 cm) 7 ve 28. günlerde basınç dayanımı açısından test edilirken, gözeneklilik ve geçirgenlik 28. günde değerlendirilmiştir. Sonuçlar, 28 günde basınç dayanımında 10,55 MPa'dan (%0) 17,08 MPa'ya (%15) bir artış, gözeneklilikte %19,13'ten %3,14'e bir azalma ve geçirgenlikte 0,070 cm/s'den 0,008 cm/s'ye bir azalma olduğunu göstermiştir. Bu azalmalar, vermikülitin agregalar arasındaki boşlukları doldurarak su akış yollarını sınırlamasına atfedilmektedir. Sonuç olarak, vermikülit geçirgen betonun mekanik performansını etkili bir şekilde artırırken, aşırı kullanımı drenaj işlevini tehlikeye atmaktadır. %5 vermikülit ilavesi, dayanım ve sızma kapasitesi arasında bir denge sağlayan optimum sınır olarak kabul edilmektedir.

Anahtar Kelimeler

• Basınç dayanımı
• Geçirgenlik
• Gözeneklilik
• Gözenekli beton
• Vermikülit

Performance analysis of pervious concrete incorporating vermiculite as an additive material

Abstract

Pervious concrete is known for its ability to absorb water and reduce surface runoff, but it often suffers from low compressive strength. To address this limitation, this study investigates the incorporation of vermiculite as an additive material with the potential to enhance concrete strength. The objective of the research is to analyze the effect of varying vermiculite content on the compressive strength, porosity, and permeability of pervious concrete. Laboratory tests were conducted using vermiculite at 0%, 5%, 10%, and 15% by total aggregate weight. Cylindrical specimens (15×30 cm) were tested for compressive strength at 7 and 28 days, while porosity and permeability were evaluated at 28 days. The results indicated an increase in compressive strength from 10.55 MPa (0%) to 17.08 MPa (15%), a reduction in porosity from 19.13% to 3.14%, and a decrease in permeability from 0.070 cm/s to 0.008 cm/s at 28 days. These reductions are attributed to vermiculite filling the voids between aggregates, thereby limiting water flow paths. Consequently, while vermiculite effectively enhances the mechanical performance of pervious concrete, excessive use compromises its drainage function. A 5% vermiculite addition is considered the optimal limit, maintaining a balance between strength and infiltration capability.

Keywords

• Compressive strength
• Permeability
• Porosity
• Porous concrete
• Vermiculite

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