EVALUATION OF ZEOLITE AND PUMICE WASTE AS MINERAL AGGREGATE AND FILLER FOR PRODUCING LIGHTWEIGHT ASPHALT CONCRETE MIXTURES

Öz

This paper focused on the use of pumice and zeolite waste as aggregate materials for producing lightweight asphalt concrete (AC) mixtures. The samples having pumice, zeolite and limestone aggregate materials were prepared for an optimum bitumen content, optimum Liquid Anti-strip (LAS) additive ratio (0.4, 0.5, 0.6, 0.8, 0.9, 1.0, and 1.1 %), and bitumen type (50/70 and 160/220) determined following the Marshall Mixture design procedure. Then, AC mixes were prepared with limestone used as the coarse aggregate and pumice and zeolite used as fine aggregate, and with limestone used as the fine aggregate and pumice and zeolite used as coarse aggregate. The stability of the mixtures was determined from the Marshall Stability tests. Zeolite and pumice were also used as mineral filler in AC mixtures. Optimum mineral filler ratio and physical properties were determined. In general, pumice and zeolite aggregate mixtures gave lower stability in comparison to limestone aggregate mixtures. These wastes can be applied as very thin wearing layer for increasing friction, to prevent pavement layers from water infiltration, and as overlay with 25-300 mm above old pavement. Because these waste materials have very low weights, they can be used as wearing layer in paving parking areas and non-heavy weight vehicle traffic in roads. The importance of using waste materials and lightweight aggregates is to reduce the environmental impact.

Anahtar Kelimeler

• Lightweight Asphalt Concrete,Zeolite,Pumice,Waste,Liquid AntiStripping Additive

HAFİF ASFALT BETONU KARIŞIMLARIN ÜRETİMİ İÇİN ZEOLİT VE POMZA ATIKLARININ MİNERAL AGREGA VE MİNERAL FİLLER OLARAK DEĞERLENDİRİLMESİ

Öz

Bu çalışmada, hafif asphalt betonu (AC) üretilmesi amacıyla pomza ve zeolit atıklarının agrega olarak kullanımı incelenmiştir. Pomza, zeolit ve kireçtaşı agregaları ile asfalt numuneler hazırlanmış ve optimum bitüm içeriği, optimum likit soyulma önleyici (LAS) katkı oranı (%0.4, 0.5, 0.6, 0.8, 0.9, 1.0 ve 11) ve bitüm tipi (50/70 ve 160/220) Marshall Karışım dizaynına göre belirlenmiştir. Daha sonar, AC karışımlar, kireçtaşı kaba agrega ve pomza ve zeolit ince agrega olarak kullanılmış ve tam aksine kireçtaşı ince agrega ve pomza ve zeolit kaba agrega olarak kullanılmıştır. Karışımların dayanımları Marshall Stabilite testi ile belirlenmiştir. Ayrıca zeolit ve pomza AC karışımlarda filler olarak kullanılmıştır. Optimum mineral filler oranı ve fiziksel özellikleri belirlenmiştir. Genel olarak, pomza ve zeolit agrega karışımları kireçtaşı ile kıyaslandığında düşük dayanım göstermiştir. Bu atıklar, sürtünmeyi artırmak amacıyla ince aşınma tabakalarında, su sızıntılarını önlemek amacıyla ve eski üstyapıların üzerine 25-300 mm kalınlığında takviye tabakası olarak kullanılabilir. Hafif olmalarından dolayı bu malzemeler otoparklarda aşınma tabakası olarak ve hafif trafik olan yollarda kullanılabilmektedir. Atık malzemeler ve hafif agregaların kullanımının önemi çevresel etkileri azaltmaktır.

Anahtar Kelimeler

• Hafif Asfalt Betonu,Zeolit,Pomza,Atık,Sıvı Soyulma Önleyici Katkı

Kaynakça

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