Retrofitting Keretakan Struktural Pedestal Hot Oil Heater Dengan Injeksi Epoksi, Grouting Non-Shrink, dan CFRP
DOI:
https://doi.org/10.17977/um071v31i12026p51-62Keywords:
pedestal, crack, retrofit, CFRPAbstract
Pedestal beton bertulang pada fasilitas Hot Oil Heater mengalami keretakan yang teridentifikasi melalui inspeksi visual, pengukuran lebar retak, dan Ultrasonic Pulse Velocity Test (UPVT). Lebar retak mencapai 0,85 mm dengan kedalaman hingga 111 mm (rata-rata ±62,7 mm), melampaui selimut beton 50 mm dan mengindikasikan retak struktural. Hasil UPVT menunjukkan kualitas beton kategori medium–good dengan kuat tekan beton aktual untuk analisis ditetapkan sebesar fc′=22 MPa, sementara mutu rencananya adalah fc’=28 MPa. Analisis kapasitas lentur–aksial memperlihatkan bahwa kombinasi beban rencana dan beban sementara saat erection (penarikan chain block) dapat melampaui kapasitas aktual penampang. Retrofit dilakukan melalui injeksi epoksi, grouting non-shrink, dan perkuatan Carbon Fiber Reinforced Polymer (CFRP). Evaluasi pasca retrofit menunjukkan peningkatan kapasitas lentur dan aksial sehingga seluruh kombinasi gaya dalam kembali berada dalam domain aman diagram interaksi fP–fM.
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