Sodyum silikat-borik asit karışımı ile enjeksiyon yapılan organik zeminlerin mühendislik özelliklerinin belirlenmesi
Küçük Resim Yok
Tarih
2022
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bursa Teknik Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada sodyum silikat ve borik asit karıştırılarak hazırlanan solüsyonların reolojik özellikleri ve seçilen solüsyonlar kullanılarak organik zemine yapılan permeasyon enjeksiyonu sonucunda numunelerin mühendislik özellikleri araştırılmıştır. Çalışmada ilk olarak sodyum silikat ve borik asit malzemeleri çeşitli oranlarda karıştırılmış ve reolojik özellikleri (jelleşme süresi, sinerez, viskozite) belirlenmiştir. Belirlenen reolojik özelliklerin sonucunda en uygun dört oran (%28 SS/Çöz. ve 2,1 g borik asit, %30 SS/Çöz. ve 2,4 g borik asit, %34 SS/Çöz. ve 2,4 g borik asit ile %42 SS/Çöz. ve 2,9 g borik asit) enjeksiyon deneylerinde kullanılmak üzere seçilmiştir. Yapılan enjeksiyonların tamamında başarı sağlanmıştır ve enjeksiyon malzemesi numunenin içerisine 1,90-2,30 bar arasında değişen basınçlarda uygulanmıştır. Enjeksiyonu tamamlanan numuneler açık, streçli ve kür havuzunda olarak üç farklı kür koşulunda bekletilmiştir. Kür havuzunda bekletilen numuneler bütünlüğünü koruyamadığı için serbest basınç dayanımı deneyi yapılamamıştır. Açıkta ve streçli olarak bekletilen numunelere 3., 7., 14., 28., 56. ve 90. günlerde serbest basınç dayanımı deneyi yapılmıştır. Numunelerin serbest basınç dayanımlarının 162,520 kPa ile 572,337 kPa arasında değiştiği tespit edilmiştir. Serbest basınç dayanımı en yüksek olan numune açık ortamda 90 gün bekletilen ve %42 SS/Çöz. oranı ile hazırlanan numunedir. Serbest basınç dayanımı en düşük olan numune ise streçli olarak 3 gün bekletilen ve %28 SS/Çöz. oranı ile hazırlanan numunedir. Numunelerin açık ortamda bekletilmiş olanları streçli olarak bekletilenlere göre yaklaşık iki kat daha fazla dayanım vermiştir. Enjeksiyonları tamamlanmış numunelere ve doğal haldeki organik zemine düşen seviyeli permeabilite deneyi yapılmıştır. Numunelerin 3., 28., 56., ve 90. günlerde düşen seviyeli permeabilite ölçümü yapılmıştır. Doğal haldeki organik zeminin permeabilite katsayısı 4,79x10-5 cm/sn olarak belirlenmiştir. Enjeksiyon yapılmış olan numunelerin permeabilite katsayıları 4,34x10-6 cm/sn ile 4,32x10-5 cm/sn arasında değişmektedir. Organik zemine yapılan permeasyon enjeksiyonu sonucunda permeabilite katsayısı yaklaşık 10 kat azaltılmıştır. Yapılan çalışmalar sonucunda sodyum silikat-borik asit solüsyonlarının organik zemine permeasyon enjeksiyonunun başarılı olduğu ve organik zemine enjekte edilen sodyum silikat-borik asit solüsyonlarının zeminin mühendislik özelliklerini iyileştirdiği belirlenmiştir.
In this study, the rheological properties of the solutions prepared by mixing sodium silicate and boric acid and the engineering properties of the samples prepared as a result of permeation grouting into organic soil using the selected mixture were investigated. First of all, sodium silicate and boric acid were mixed in different ratios and their rheological properties (gelling time, syneresis, viscosity) were determined. Solutions used in grouting were identified as Ratio A, in which 2,1 g of boric acid was mixed into a solution with a ratio of 28% SS/Sol., Ratio B, in which 2,4 g of boric acid was mixed into a solution with a ratio of 30% SS/Sol., Ratio C, in which 2,4 g boric acid was mixed into a solution with a ratio of 34% SS/Sol., Ratio D, in which 2,4 g of boric acid was mixed into a solution with a ratio of 42% SS/Sol. All grouting tests were successful, and the mixture was performed on the samples in grouting pressure values changing from 1,90 to 2,30 bar. The samples whose grouting processes had been completed were stored under three different curing conditions, namely air dried, stretch wrapped, and water-cured environments. Since the samples stored in water-cured environment could not stay integrated, unconfined compression tests were not performed on them. Unconfined compression tests were performed on the samples stored under air dried and stretch wrapped conditions on the 3rd, 7th, 14th, 28th, 56th, and 90th days. It is ascertained that the strength values of the samples vary between 162,520 kPa and 572,337 kPa. The strength values of the samples increased with the time of their storage. The sample with the maximum strength value is the one prepared with %42 SS/Sol. ratio and stored for 90 days. The sample with the minimum strength value is the one prepared with %28 SS/Sol. ratio and stored for 3 days. Compared to the ones stored in stretch wrapped environment, the samples stored in air dried environment have almost twice the strength value. Permeability test was carried out on the grouted and ingrouted samples. Permeability coefficients of the samples were determined on the 3rd, 28th, 56th, and 90th days. The permeability coefficient of the ingrouted organic soil was 4,79x10-5 cm/sec. The permeability coefficients of the grouted samples vary between 4,34x10-6 cm/sec and 6,83x10-5 cm/sec. The permeability coefficient of the organic soil used in this test was reduced 10 times by performing permeation grouting procured through sodium silicate and boric acid mixture. The permeability coefficient reaches its maximum value when the SS/Sol. ratio is %34. As a result of this study, it is determined that the permeation grouting of sodium silicate-boric acid solutions into organic soil is successful and that the sodium silicate-boric acid solutions grouted into organic soil improve the engineering properties of the soil.
In this study, the rheological properties of the solutions prepared by mixing sodium silicate and boric acid and the engineering properties of the samples prepared as a result of permeation grouting into organic soil using the selected mixture were investigated. First of all, sodium silicate and boric acid were mixed in different ratios and their rheological properties (gelling time, syneresis, viscosity) were determined. Solutions used in grouting were identified as Ratio A, in which 2,1 g of boric acid was mixed into a solution with a ratio of 28% SS/Sol., Ratio B, in which 2,4 g of boric acid was mixed into a solution with a ratio of 30% SS/Sol., Ratio C, in which 2,4 g boric acid was mixed into a solution with a ratio of 34% SS/Sol., Ratio D, in which 2,4 g of boric acid was mixed into a solution with a ratio of 42% SS/Sol. All grouting tests were successful, and the mixture was performed on the samples in grouting pressure values changing from 1,90 to 2,30 bar. The samples whose grouting processes had been completed were stored under three different curing conditions, namely air dried, stretch wrapped, and water-cured environments. Since the samples stored in water-cured environment could not stay integrated, unconfined compression tests were not performed on them. Unconfined compression tests were performed on the samples stored under air dried and stretch wrapped conditions on the 3rd, 7th, 14th, 28th, 56th, and 90th days. It is ascertained that the strength values of the samples vary between 162,520 kPa and 572,337 kPa. The strength values of the samples increased with the time of their storage. The sample with the maximum strength value is the one prepared with %42 SS/Sol. ratio and stored for 90 days. The sample with the minimum strength value is the one prepared with %28 SS/Sol. ratio and stored for 3 days. Compared to the ones stored in stretch wrapped environment, the samples stored in air dried environment have almost twice the strength value. Permeability test was carried out on the grouted and ingrouted samples. Permeability coefficients of the samples were determined on the 3rd, 28th, 56th, and 90th days. The permeability coefficient of the ingrouted organic soil was 4,79x10-5 cm/sec. The permeability coefficients of the grouted samples vary between 4,34x10-6 cm/sec and 6,83x10-5 cm/sec. The permeability coefficient of the organic soil used in this test was reduced 10 times by performing permeation grouting procured through sodium silicate and boric acid mixture. The permeability coefficient reaches its maximum value when the SS/Sol. ratio is %34. As a result of this study, it is determined that the permeation grouting of sodium silicate-boric acid solutions into organic soil is successful and that the sodium silicate-boric acid solutions grouted into organic soil improve the engineering properties of the soil.
Açıklama
Lisansüstü Eğitim Enstitüsü, İnşaat Mühendisliği Ana Bilim Dalı, Geoteknik Bilim Dalı
Anahtar Kelimeler
İnşaat Mühendisliği, Civil Engineering
