Nano Silica and Micro Silica Effect on Mechanical Attributes of Ferrochrome Slag Based Geopolymer

Year 2020, Volume: 8 Issue: 1, 347 - 362, 31.01.2020

Mehrzad Mohabbı

https://doi.org/10.29130/dubited.587321

Cited By: 4

Abstract

Considering global
trends in sustainable and green development as well as the major drawbacks of
conventional hydraulic cement, accelerate attempt for finding a suitable
alternative and likely cause further development of geopolymeric cements in
future. Influences of Nano scale Materials in improving the mechanical
properties of ordinary Portland cement have been obviously proved. Despite the
widespread use of these materials in different fields of science, for instance,
chemicals engineering, materials engineering and even ordinary Portland cement,
the effect of Nano scale materials in geopolymers has not been investigated
deservedly. The purpose of this study is creating bridges to mitigate these
gaps and shortcomings. Very fine silica particles (micro and Nano-silica)
effects in ferrochrome slag based geopolymer have been evaluated in this
research. Elazığ ferrochrome slag was used as the main aluminosilicate source
and then it was blended with Nano silica or silica fume in little amounts in
order to accelerate geopolymerization. Nano-silica and silica fume have been
used at 2,4,6,8 and 10% of total binder weight in this study due to probe fine
silica effect on the mechanical specification of produced material such as
compressive strength, Static modulus of elasticity, Tensile Strength and
microstructural change. The experimental results show all of these mention
mechanical properties have been improved with adding fine silica in geopolymer
mixes in optimum percentage of total binder weight. The best percentage of fine
silica partial replacement instead of FS is 6% at all of silica fume and three
Nano particle size (15, 30 and 45 nm). SEM images assessment demonstrated
homogenous and denser texture with acceptable chemical bonds improvements for
samples with optimum Nano-silica dosage. Compressive strength increase can be
explained by densification of the matrix texture by using of Nano-silica and
silica fume at optimum dosage.

Keywords

Compressive strength, Geopolymer, Nano-silica, SEM, Splitting Tensile Strength

Thanks

The author gratefully acknowledge the Elazıg Ferrochrome plant for providing Ferrochrome Slag.

Nano Silika ve Mikro Silika Ferrokrom Cürufu Bazlı Geopolimerlerin Mekanik Özelliklerine Etkisi

Abstract

Geleneksel çimentoların dezavantajları uluslararası
sürdürülebilir ve yeşil kalkınma planları üzerinde yoğun talep yaşanmasına
neden olmaktadır. Geopolimer malzemenin daha fazla geliştirilmesi veya
alternatif malzemenin araştırılmasına dayalı çalışmaların gelecekte hızlanması
beklenmektedir. Sıklıkla kullanılan Portland çimentosunun mekanik
özelliklerinin geliştirilmesinde nano ölçekli malzemelerin katkısı literatürde
kanıtlanmıştır. Nano ölçekli silika malzemeler, kimya ve malzeme mühendisliği
gibi farklı bilim dallarında ve hatta sıradan Portland çimentosu üretiminde
bile yoğun kullanılmasına ve araştırılmasına rağmen geopolimer üretiminde
yeterince incelenmemiştir. Bu çalışmanın amacı bu konudaki boşlukları azaltmak
ve önceden elde edilen bilgileri geopolimerler üzerine aktarmaktır. Bu çalışma
esnasında nano ve mikro ölçekli silis malzemelerin ferrokrom cüruf bazlı
geopolimerler üzerindeki etkisi değerlendirilmiştir. Elazığ ferrokrom cürufu
alümino-silis kaynağı olarak bu çalışmada kullanılmıştır. Geopolimerleşme sürecini
hızlandırmak için Nano-silis ve silis dumanı cüruf ağırlığının %2, %4, %6, %8
ve %10 oranlarında kullanılmıştır ve üretilen malzemelerin basınç ile çekme
mukavemeti, elastisite modülü ve mikro yapısı üzerindeki etkisi incelenmiştir.
Deney sonuçlarına göre, geopolimer karışıma uygun miktarda ince silis
malzemesinin eklenmesiyle malzemenin yukarıda bahsedilen mekanik özelliklerinde
iyileşme meydana gelmiştir. Ferrokrom cüruf yerine farklı mikro ve nano
boyutlarında (15, 30 ve 45 nm) silis kullanım oranı optimum %6 olarak
belirlenmiştir. Numunelerde uygun değerde Nano-silis kullanımı, malzemenin
kimyasal bağlarında iyileşme, homojen ve daha yoğun dokuya sahip olmasını
sağlamıştır ve SEM görüntülerinde bu durum açıkça görülmektedir. Basınç
mukavemetinin artışının, Nano-silis ve silis dumanının uygun değerde
kullanılması sonucunda malzemenin dokusunun yoğunlaşmasından ve kimyasal
bağlarının iyileşmesinden kaynaklandığı düşünülmektedir.

Keywords

Basınç Dayanımı, Geopolimer, Nano-Silika, SEM, Yarmada Çekme Dayanımı

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