Orta Derece Isı ve Kür Etkisinin Atık Lastik İnce Agrega ile Üretilmiş Harç Özellikleri Üzerine Etkisi

Bu laboratuvar çalışması ile atık lastik ince agrega ile üretilen harçların mekanik özellikleri üzerinde kür ve orta dereceli ısı etkisinin nasıl bir etki yaptığını belirtmek amaçlamaktadır. Bu sebeple, karışım hesabında %0, %10 ve %20 gibi üç çeşit atık lastik oranı kullanıldı. Harç numunelerinin karışım hesabında 520 kg çimento kullanıldı. Kullanılan çimento türü, CEM I 42.5 R Portland çimentosu ve su/çimento oranı, tüm karışım tasarımında 0.485 seviyesinde tutulmuştur. Harcın içinde rilem kumu kullanılmıştır. Karışımda yuvarlak atık kauçuk kullanılmış ve kullanılan atık kauçukların dane boyutu 1-4 mm arasındadır. Kür süresinin etkisi, üç farklı atık lastik içeriğinin temelinde basınç dayanımı ve aşınma direnci açısından değerlendirildi. Dahası, basınç dayanımları iki farklı sıcaklık seviyesinde, yani 150oC ve 200oC'de ve üç farklı kür süresi koşuluyla, yani 3 gün, 7 gün ve 28 gün ile değerlendirildi. Sonuç olarak, basınç dayanımı açısından, harcın erken yaşlardaki değerlerinde sabit bir düşüş gözlenirken, 28 günlük kür koşullarında keskin bir düşüş görülmüştür. Aşınma direnci ile ilgili olarak, numunelerin erken yaşlarında aşınma kaybının arttığı belirlenmiştir. Bununla birlikte; aşınma kaybı, artan atık lastik içeriğiyle azalmıştır.

Anahtar Kelimeler:

Kür etkisi, ince agrega, harç, atık lastik, sıcaklık etkisi

Mid-Temperature Thermal Effects on Properties of Mortar Produced with Waste Rubber as Fine Aggregate

This laboratory study aims to investigate curing and thermal effect on mechanical properties of mortar produced with waste rubber as fine aggregate. For this purpose, three type of rubber content was used in mix design like 0%, 10% and 20%. Mortar specimens were produced with 520 kg cement. The type of used cement is CEM I 42.5 R ordinary Portland cement and w/c ratio were kept at 0.485 level at all mix design. Rilem sand was used in the mortar. Rolled crumb waste rubber was used in the composition and the grain size of used waste rubber was between 1-4 mm. The effect of curing age was evaluated on compressive strength and abrasion resistance on the base of three distinct rubber content. Moreover, the compressive strength results were evaluated with two different temperature levels, i.e. 1500C and 2000C and three different curing age condition, i.e. 3 days, 7 days and 28 days. As a result, it was observed that there is a constant decrease at early curing age of mortar in terms of compressive strength, but there is a sharp decrease at 28-days curing condition. As for abrasion resistance, it was determined that abrasion loss was increased in the early curing age of specimens. However, abrasion loss was decreased with increasing rubber content.

Keywords:

Curing effect, fine aggregate, mortar, recycled rubber, temperature effect,

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