Farklı viskozite düzenleyici katkı maddelerinin kendiliğinden yerleşen harçların mekanik ve akış özelliklerine etkisi

Öz

Kendiliğinden yerleşen beton, su altı betonu, püskürtme beton gibi özel betonların reoloji tasarımında bazı gereksinimlere ihtiyaç duyulmaktadır. Örneğin istenilen beton akışının tasarımında çeşitli akışkanlaştırıcı katkı maddeleri ile birlikte bazı viskozite düzenleyici katkılar (VDK) kullanılmaktadır. Ancak akış parametrelerini tasarlamak için kullanılan bu katkı maddelerinden hangisinin daha uygun olduğunu belirlemek için çalışmalara ihtiyaç vardır. Burada, ticari olarak kullanılan iki VDK'nın kendiliğinden yerleşen harçlar üzerindeki mekanik ve reolojik etkileri araştırılmıştır. Bu amaçla, karışımlara çeşitli oranlarda çimento ağırlığına göre (%0.01-0.1) katılan welan sakızı (WS) ve ksantan sakızı (KS)'nin etkilerini belirlemek için basınç-eğilme mukavemeti testleri ve mini-slump, mini-V huni testleri yapılmıştır. FE-SEM görüntüleri ile desteklenen çalışmada, WS'nin mekanik davranış üzerinde olumlu bir etkiye, KS'nin ise olumsuz bir etkiye sahip olduğu, ancak KS'nin akış özellikleri üzerinde WS'ye göre daha etkili olduğu sonucuna varmıştır.

Anahtar Kelimeler

• Welan sakızı
• Ksatan sakızı
• Kendiliğinden yerleşen harç
• Viskozite düzenleyici katkı

The effect of different viscosity modifying additives on the mechanical and flow properties of self-compacting mortars

Abstract

Some requirements are needed in the rheology design of special concretes such as self-compacting concrete, underwater concrete, shotcrete. For example, in the design of the desired concrete flow, some viscosity modifying agents (VMA) are used with various plasticizer additives. However, studies are needed to determine which of these additives used to design flow parameters is more appropriate. Herein, the mechanical and rheological effects of two commercially used VMAs on self-compacting mortars were investigated. For this purpose, compressive-flexural strength tests and mini-slump, mini-V funnel tests were conducted to determine the effects of welan gum (WG), and xanthan gum (XG) included in the mixtures at various ratios (0.01-0.1%) by weight of cement. The study supported by FE-SEM analysis concluded that WS had a positive effect on mechanical behavior, while XG had a negative effect, but XG was more effective on flow properties than WG.

Keywords

• Welan gum
• Xanthan gum
• Self-compacting mortar
• Viscosity modifying agent

Kaynakça

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