DOLGU-SAPLAMA ARAYÜZEYİ KESME DİRENCİNİN DOLGUNUN BASINÇ DAYANIMI İLE TAHMİNİ

Bu makale, kaya saplamaları için geliştirilen dolgu malzemelerinin deneysel sonuçlarını içermektedir. Deneysel çalışmalar, mineral katkıların kaya saplaması ve dolgu arasındaki aderans dayanımına etkilerini kapsamaktadır. Literatürde mineral katkıların beton dayanımına etkileri ile ilgili çok sayıda çalışma bulunmaktadır. Ancak, bu katkıların saplamaların mekanik özelliklerine etkilerine dair çalışma sayısı oldukça azdır. Saplama çekme kapasitesini geliştirmek amacıyla 10 farklı dolgu malzemesi ve 4 farklı kür süresi için toplam 120 adet çekme testi gerçekleştirilmiştir. Kontrol dolgusu dışındaki dolgu karışımları, çimento ağırlığının ağırlıkça %15’i yerine mineral katkı kullanılarak hazırlanmıştır. Metakaolin ve silis dumanlı dolguların her yaşta daha yüksek dayanımlara sahip oldukları belirlenmiştir. Uçucu kül kullanılan dolgunun 28 günlük kür süresine kadar tüm dayanımları düşük değerler gösterirken sonrasında dikkate değer şekilde artmıştır. Çimentonun atık mineral katkılar ile birlikte kullanılmasıyla yüksek dayanımlı dolgular elde edilebilir ve bu dolgular tünelcilik uygulamalarında kullanılabilir. Böylece düşük maliyetli ve yüksek dayanımlı çimento üretilebilecektir ve atık kullanımı ile çevresel problemlerin çözümüne katkıda bulunulabilecektir.

Anahtar Kelimeler:

Kaya saplaması, dolgu, mineral katkı, metakaolin, silis dumanı

ESTIMATION OF THE SHEAR STRESS OF GROUT-BOLT INTERFACE BY COMPRESSIVE STRENGTH OF GROUT

This paper represents the experimental results of the grout materials developed for rockbolts. Experimental studies cover the effects of mineral admixtures on the bond characteristics between grout and rockbolts. There are many studies in the literature about the effects of mineral admixtures on concrete strength. However, the number of studies on the effects of these admixtures on the mechanical properties of rockbolts are quite limited. Totally 120 rockbolt pull-out tests were carried out using ten different grout types in order to improve the load bearing capacity for four different curing times. Grout mixtures outside the reference grout were prepared using mineral admixtures instead of 15% by weight of the cement weight. Metakaolin and silica fume additive grouts were found to have higher strengths at all ages. The all strength test of fly ash grouts exhibited low values till 28 days of curing time, but a sharp increase was observed after this period. It is concluded that cement, in combination with waste mineral admixtures, can be utilized in making high strength grout and such grout can be used as grouting material at tunnelling applications. Thus, grout having low cost and high-strength can be produced with waste materials and waste utilization will be contributing to the solution of environmental problems.

Keywords:

Rockbolt, grout, mineral admixture, metakaolin,

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