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

Year 2016, Volume: 22 Issue: 6, 478 - 485, 20.12.2016

Cevdet Emin Ekinci , Sevil Ay , Nurdan Baykuş , Adem Ay

Abstract

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.

Keywords

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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