DOLGU-SAPLAMA ARAYÜZEYİ KESME DİRENCİNİN DOLGUNUN BASINÇ DAYANIMI İLE TAHMİNİ

Year 2017, , 661 - 669, 31.07.2017

Ahmet Teymen

https://doi.org/10.28948/ngumuh.341831

Abstract

   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.

Keywords

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

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

Abstract

   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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