ARTÍCULO
TITULO

KEKUATAN LEKAT BETON DAN BAJA TULANGAN AKIBAT PEMANASAN

Ellen Kumaat    

Resumen

The combination of concrete and steel form economical and efficient composite material by means ofthe created cooperation through bond stress on the interface of both materials. Heating at varyingtemperature would result in behaviour change of the composite material, particularly regarding itsbond stress performance due to the microstructure change of the concrete and steel.The uniaxial compression test indicated that the value of concrete compression strength on seven daysif heated at 2000 C , 5000 C, and 8000 C temperature would decrease, varying from six to 100%,whereas the decrease of concrete compression strength on 28 days varying from ten to 90%. At 2000 Cheating, the decrease of bond stress between steel and concrete on 28 days was approximately 30%.Heating at a higher temperature or at 5000 C would lead to 40% to 77% decrease. The decrease ofconcrete compression and that of bond stress due to heating was presented by a non-linear curveshowing that there was a positive correlation between the two characteristics. Abstract in Bahasa Indonesia : Perpaduan antara material beton dan baja tulangan akan membentuk material komposit yangekonomis serta efisien lewat hasil kerjasama yang tercipta melalui kekuatan lekat pada interfacekedua material tersebut. Pemanasan dengan temperatur yang bervariasi akan menyebabkanterjadinya perubahan perilaku material komposit tersebut, khususnya menyangkut kinerjakekuatan lekatnya akibat perubahan mikrostruktur pada material beton dan material bajatulangan.Dari hasil uji tekan uniaksial diperoleh nilai kuat tekan beton umur tujuh hari yang biladipanaskan dengan temperatur 200oC, 500oC dan 800oC akan mengalami penurunan yangbervariasi antara enam hingga 100%, sedangkan penurunan kuat tekan beton pada umur 28 hariberkisar antara sepuluh hingga 90%. Pada tingkat pemanasan dengan temperatur 200oC,penurunan kekuatan lekat antara baja tulangan dan beton umur 28 hari adalah sekitar 30%, sertauntuk pemanasan dengan temperatur yang lebih besar atau sama dengan 500oC akan terjadipenurunan sebesar 40% hingga 77%. Penurunan kuat tekan beton dan penurunan kekuatan lekatbeton dengan baja tulangan akibat pemanasan dipresentasikan oleh kurva tidak linier sertamenunjukkan adanya korelasi positif antara kedua karakteristik tersebu

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