Lignin sülfonat esaslı yapı kimyasalların taze ve sertleşmiş betona olan etkilerinin incelenmesi

Öz

Bu çalışmada, lignin sülfonat esaslı yapı kimyasalların betonun taze ve sertleşmiş özelliklerine olan etkileri kimyasal katkı maddelerin bir kıyaslaması yapılarak incelenmiştir. C25/30 ve C20/25 hedef beton sınıfı için çimento ve kimyasal katkı miktarı sabit; su ve agrega miktarında değişiklik yapılmıştır. Betonların basınç dayanım değerleri 1., 7. ve 28. günlerde alınmıştır. Bütün beton numunelerinin 1., 7. ve 28 günlük basınç dayanımlarında önemli artış gözlemlenmiştir. 1. Grup çalışma ÇF1 firmasından temin edilen Cem I 42.5 R tipi çimento ile C25/30 ve 2. Grup çalışma ise ÇF2 firmasından temin edilen Cem II 32.5 N tipi çimento ile C20/25 dayanım sınıfı hedeflenmiştir. 1. Grup çalışmada karma su miktarı en az %10.8 düzeyinde bir azaltmanın 2. Grup çalışmada ise en az %8.1 azaltmanın olabileceği ortaya konulmuştur. Sonuç olarak, lignin sülfonat esaslı yapı kimyasalı kullanımının taze betonun kıvam, sıcaklık ve birim ağırlık gibi özelliklerde meydana gelen değişikliklerin betonun basınç dayanımı gelişimini olumsuz yönde etkilemediği anlaşılmıştır.

Anahtar Kelimeler

• Beton,Lignin sülfonat,Çimento,Kıvam,Beton sıcaklığı

Examination of the impact of lignin sulfonate based structure chemicals on fresh and hardened concrete

Abstract

In this study, the impact of the addition of lignin sulfonate based chemicals on the properties of fresh and hardened concrete were examined. For C25/30 and C20/25 target class concretes, cement and chemical additive amounts were constant; changes were made only to water and aggregate amounts. Compressive strength values of the concretes were taken on the 1^st, 7^th and 28^th days. Increases of compressive strength values were observed on days 1, 7, and 28. In the 1st study, in which C25/30 strength class was targeted for Cem I 42.5 R type cement provided by firm CF1, it was revealed that a 10.8% decrease in mixed water amount may occur. In the 2^nd study, in which C20/25 strength class was targeted for Cem II 32.5 N type cement provided by firm CF2, it was revealed that a minimum 8.1% decrease may occur. In conclusion, although changes to viscosity, heat and unit weight of fresh concrete are caused by usage of lignin sulfonate based chemicals, they had no adverse effect on compressive strength of the concrete in this study.

Keywords

• Concrete,Lignin sulfonate,Cement,Viscosity,Concrete heat

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