TY  - JOUR
T1  - Influence of Gypsum Content and Curing Time on the Strength Behavior of Kaolin Soil
TT  - Alçı İçeriği ve Kür Süresinin Kaolin Zemininin Dayanım Davranışı Üzerindeki Etkisi
AU  - Gençdal, Hazal Berrak
AU  - Fercan, Nazife Özge
AU  - Kartopu, Can
AU  - Güllü, Salih Melih
PY  - 2026
DA  - June
Y2  - 2026
DO  - 10.62520/fujece.1858310
JF  - Firat University Journal of Experimental and Computational Engineering
JO  - FUJECE
PB  - Fırat Üniversitesi
WT  - DergiPark
SN  - 2822-2881
SP  - 418
EP  - 437
VL  - 5
IS  - 2
LA  - en
AB  - The reusage of gypsum-based construction materials in geotechnical applications provides a sustainable alternative for soil stabilization. In this study, the effects of synthetic gypsum (CaSO4·½H2O) on the physical and mechanical properties of a low-plasticity silt (ML) type kaolin soil were experimentally investigated. Atterberg limit, standard Proctor and unconfined compressive strength (UCS) tests were applied on untreated and treated soil samples by rates of 2%, 5%, 8%, and 11% gypsum by dry weight for curing periods of 1 and 15 days. The results of the experiments revealed a significant change in the mechanicai behavior of the soil by the usage of gypsum treatment. The soil plasticity decreased by low to moderate gypsum additive while an improvement was observed for the compaction characteristics pointing out a denser and more stable particle structure. A clear improvement has been observed for strength properties of the soil with increasing gyspum content up to an optimum level, pointing out an enhancement for interparticle bonding and pozzolanic interactions in the soil matrix. Besides, higher gypsum rates resulted in a strength reduction by increased deformability, pointing out a distortion in the soil fabric and the formation of less effective bonding at excess rate of binder contents. Consequently, the findings revealed that construction material type gypsum can serve as an effective stabilizing binder for ML-type soils when applied at moderate rates. However potential durability problems and long-term performance should be carefully considered in practical applications.
KW  - Gypsum
KW  - Unconfined compresssive strength
KW  - Low plasticity silt
KW  - Kaolin
KW  - Soil treatment
N2  - Alçı esaslı yapı malzemelerinin geoteknik uygulamalarda yeniden kullanımı, zemin iyileştirmesi için sürdürülebilir bir alternatif sunmaktadır. Bu çalışmada, sentetik alçının (CaSO4·½H2O), düşük plastisiteli bir silt (ML) tipi kaolin zemininin fiziksel ve mekanik özellikleri üzerindeki etkileri deneysel olarak incelenmiştir.  Zemin iyileştirme için, kuru zemin ağırlığına göre %2, %5, %8 ve %11 oranlarında alçı kullanılmıştır. Alçı katkısı ilave edilmiş ve edilmemiş numuneler üzerinde 1 ve 15 günlük kür süreleri sonunda Atterberg limitleri, standart Proctor ve serbest basınç dayanımı (UCS) deneyleri gerçekleştirilmiştir. Deneysel sonuçlar, alçı ilavesinin zeminin mühendislik davranışını önemli ölçüde değiştirdiğini göstermektedir. Düşük ve orta düzeyde alçı ilavesinin zemin plastisitesini azalttığı ve sıkışma özelliklerini iyileştirdiği, bunun da daha yoğun ve daha kararlı bir zemin yapısına işaret ettiği belirlenmiştir. Veriler, alçı içeriğinin optimum bir seviyeye kadar arttıkça belirgin bir dayanım artışı meydana getirdiğini ortaya koymuştur. Bu artış, zemin matrisi içerisinde dane bağlanmasının iyileşmesi ve puzolanik etkileşimlerin gelişmesiyle ilişkilendirilmektedir. Buna karşın, daha yüksek alçı oranlarında dayanımın azaldığı ve deformabilitenin arttığı gözlemlenmiş olup, bu durum aşırı bağlayıcı içeriğinin zemin dokusunu bozduğunu ve daha az etkili bağlanma oluşumuna neden olduğunu işaret etmektedir. Sonuç olarak elde edilen bulgular, yapı malzemesi olarak kullanılan alçının ML tipi zeminler için orta düzey oranlarda uygulandığında etkili bir stabilizasyon malzemesi olarak kullanılabileceğini göstermektedir. Ancak, uygulamada olası dayanıklılık sorunları ile uzun dönem performansın dikkatle değerlendirilmesi gerekmektedir.
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UR  - https://doi.org/10.62520/fujece.1858310
L1  - https://dergipark.org.tr/tr/download/article-file/5579536
ER  -