Investigation of the Effects of Linear Alkyl Benzene Sulphonic Acid Modification on the Temperature Susceptibility and Viscoelastic Behaviour of Bitumen

Abstract

It is known that, alkyl benzene derived amphiphiles are used in the asphalt industry due to their retarding properties of asphaltene precipitation, but studies on this subject are limited. Within the scope of this study, the utilization of linear alkyl benzene sulfonic acid (LABSA) surfactant with bitumen was evaluated by penetration and softening point tests together with dynamic shear rheometer investigations. Considering the penetration index and complex shear modulus values of the samples produced with different LABSA contents, temperature sensitivity and viscoelastic behaviours were investigated. In addition, the performance of the samples after short-term and long-term aging was also examined, so that the effects of LABSA content against aging were studied. According to the results, it is seen that the use of LABSA significantly reduces the temperature susceptibility and improves the bitumen's elastic behaviour. Additionally, LABSA modification increased the aging resistance of the bitumen. Utilization of LABSA at the rate of 2% of bitumen weight provided the best results in terms of temperature sensitivity and elastic performance among the samples.

Keywords

• Linear alkyl benzene sulphonic acid
• Bitumen modification
• Temperature susceptibility
• Complex shear modulus
• Aging

LİNEER ALKİL BENZEN SULFONİK ASİT MODİFİKASYONUNUN BİTÜMÜN SICAKLIK HASSASİYETİ VE VİSKOELASTİK DAVRANIŞINA ETKİLERİNİN İNCELENMESİ

Abstract

Alkil benzen’den türetilmiş amfifillerin, asfalten çökelmesini geciktirici özellikleri sebebiyle, asfalt endüstrisinde kullanıldığı bilinmektedir, ancak bu konuda yapılmış çalışmalar kısıtlıdır. Çalışma kapsamında, deterjan endüstrisinde kullanılan lineer alkil benzen sülfonik asit (LABSA) sürfaktanının bitüm ile kullanımı, penetrasyon ve yumuşama noktası deneyi ile dinamik kayma reometresi kullanılarak incelenmiştir. Farklı LABSA içerikleri ile üretilmiş numunelerin penetrasyon indeksi ve kompleks kayma modül değerleri göz önünde bulundurularak sıcaklık hassasiyeti ve viskoelastik davranışları araştırılmıştır. Ayrıca, numunelerin kısa dönem ve uzun dönem yaşlanma sonrasındaki performansları da incelenerek LABSA içeriğinin yaşlanmaya karşı etkileri irdelenmiştir. Elde edilen sonuçlara göre, LABSA kullanımının sıcaklık hassasiyetini belirgin özellikte azalttığı ve bitüme elastik davranış kazandırdığı görülmektedir. Bitüm ağırlığının %2’si oranında LABSA kullanımı, sıcaklık hassasiyeti ve elastik performans açısından en uygun sonuçları vermektedir. Bununla birlikte, LABSA modifikasyonunun bitümün yaşlanmaya karşı direncini arttırmaktadır.

Keywords

• Lineer alkil benzen sülfonik asit
• Bitüm modifikasyonu
• Sıcaklık hassasiyeti
• Kompleks kayma modülü
• Yaşlanma

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