The Effect of Sulfonate and Phosphate Anionic Monomers of Water Reducing Admixtures on Fresh State and Mechanical Properties of Self Compacting Concrete

Öz

In this study, the effect of anionic monomer content of polycarboxylate-ether based water reducing admixture on various fresh and hardened state properties of self-compacting concrete (SCC)
mixtures was investigated. For this purpose, in addition to the control admixture whose anionic monomer is 100% carboxylate, 5 different water reducing admixtures were synthesized by replacing the anionic monomer of the control admixture with 10% and 30% sulfonate and phosphate. According to the results, the substitution of the water reducing admixture anionic monomer with sulfonate increases the admixture requirement of the mixtures; had a positive effect on time-dependent flowing performances. In the case of phosphate substitution, the admixture requirement of the mixtures decreased, while the time-dependent flowing performance was adversely affected. The best performance among all mixtures was obtained with 10% sulfonate substituted admixture. The anionic monomer change did not cause any significant changes in the compressive strength, water absorption rates, ultrasonic pulse velocity (UPV) and dynamic elasticity modules of the SCC mixtures. 

Anahtar Kelimeler

• Water reducing admixture
• self compacting concrete
• anionic monomer
• carboxylate
• phosphate
• sulfonate

SU AZALTICI KATKILARDA SÜLFONAT VE FOSFAT ANYONİK MONOMERLERİN KENDİLİĞİNDEN YERLEŞEN BETONLARIN TAZE HAL VE MEKANİK ÖZELLİKLERİNE ETKİSİ

Öz

Bu çalışmada, polikarboksilat-eter esaslı su azaltıcı katkının anyonik monomer içeriğinin kendiliğinden yerleşebilen beton (KYB) karışımlarının çeşitli taze ve sertleşmiş hal özelliklerine etkisi araştırılmıştır. Bu amaçla, anyonik monomeri %100 karboksilat olan kontrol katkısına ilaveten, kontrol katkısının anyonik monomerinin %10 ve %30 oranında sülfonat ve fosfat ile ikame edilmesiyle
birbirinden farklı 5 adet su azaltıcı katkı sentezlenmiştir. Elde edilen sonuçlara göre, su azaltıcı katkı anyonik monomerinin sülfonat ile ikame edilmesi, karışımların katkı ihtiyacını artırırken; zamana bağlı yayılma performanslarını olumlu yönde etkilemiştir. Fosfat ikame edilmesi durumunda ise karışımların katkı ihtiyacı azalırken zamana bağlı yayılma performansı olumsuz etkilenmiştir. Tüm karışımlar içerisinde taze hal özellikleri açısından en iyi performans %10 sülfonat ikame edilen katkı ile elde edilmiştir. Anyonik monomer değişimi, KYB karışımlarının basınç dayanımları, su emme oranları, ultrases geçiş hızları (UPV) ve dinamik elastisite modüllerinde önemli bir değişikliğe sebep olmamıştır

Anahtar Kelimeler

• Su azaltıcı katkı
• kendiliğinden yerleşen beton
• anyonik monomer
• karboksilat
• fosfat
• sülfonat

Kaynakça

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