A RESIN TYPE ADDITIVE USE TO IMPROVE LOAD BEARING CAPACITIES OF GROUTED ROCK BOLTS EXPOSED TO THERMAL CYCLES

Abstract

A thermoset PMS (Polyvinyl modified silicone) type polymer additive effect on load bearing capacities of cement grouted rock bolt specimens exposed to thermal cycles was investigated with a series of experimental studies. The additive used in this study was in liquid phase while adding into the fresh cement mix and started to solidify by polymerization after being mixed well in the cement grout. The silicone based thermoset product was selected to use because of its ability of polymerization in contact with water. According to the results of this study, the load bearing capacity loss due to thermal cycles was found to be notably limited as a result of using the thermoset additive. Therefore, the additive tested in this study was assessed to improve resistivities of the cement grouted rock bolts against the thermal changes.

Keywords

• Rock Bolts
• Grout Materials
• Grouts in Rock Bolting
• Thermal Resistivity
• Thermoset Polymer Additive

TERMAL ÇEVRİMLERE MARUZ KALMIŞ DOLGULU KAYA SAPLAMALARININ TAŞIMA KAPASİTELERİNİN ARTIRILMASI İÇİN REÇİNE TÜRÜ BİR KATKI KULLANIMI

Abstract

Termal döngülere maruz bırakılan çimento enjeksiyonlu kaya saplaması numunelerinin yük taşıma kapasiteleri üzerinde PMS tipi bir termoset polimer katkının etkisi bir dizi deneysel çalışma ile incelenmiştir. Bu çalışmada kullanılan katkı taze çimento karışımına ilave edilirken sıvı fazda olup, çimento şerbetinde iyice karıştırıldıktan sonra polimerizasyon ile katılaşmaya başlamıştır. Kullanılan termoset ürün su ile temas halinde polimerleşebilme özelliğinden dolayı tercih edilmiştir. Bu çalışmanın sonuçlarına göre, polivinil modifiyeli silikon türü termoset reçine katkısının kullanılması sonucunda termal çevrimlerden kaynaklanan yük taşıma kapasitesi kaybının oldukça azaldığı tespit edilmiştir. Bu nedenle, bu çalışmada test edilen katkı maddesinin çimento enjeksiyonlu kaya saplamalarının termal değişimlere karşı dirençlerini geliştirmek için kullanılabilir olduğu değerlendirilmiştir.

Keywords

• Kaya Saplamaları
• Dolgu Malzemeleri
• Kaya Saplamalarında Dolgu
• Termal Direnç
• Termoset Polimer Katkı

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