Nghie n cu u na�
y thi nghie# m cu o �
ng o# ba m di nh giu a co t the p va�
be to ng su du#ng ca t bie n o Phu Quo c, Kie n Giang trong ca c ie �
u kie# n ba o du o ng kha c nhau. To ng co# ng 120 ma u la ng tru# tro�
n vo i co t the p cho n sa u a u o #c u c va�
thi nghie# m ke o tuo# t. Ca c tho ng so kha o sa t la�
ca p pho i be to ng (ma c 200 va�
ma c 300), loa#i ca t (ca t so ng va�
ca t bie n), tho �
i gian ba o du o ng (7, 14, 28, 90 va�
180 nga�
y) va�
ie �
u kie# n ba o du o ng (nu o c ngo#t va�
nu o c ma# n). Ke t qua thi nghie# m cho tha y kho ng co su # kha c bie# t a ng ke giu a cu o �
ng o# ba m di nh cu a be to ng su du#ng ca t so ng va�
ca t bie n cho e n 180 nga�
y. Cu o �
ng o# ba m di nh ta ng nhanh khi ba o du o ng tu �
7 nga�
y e n 28 nga�
y nhu ng ta ng cha# m ho n tu �
sau 28 nga�
y e n 180 nga�
y. Cu o �
ng o# ba m di nh cu a ca c ma u nga m trong nu o c ngo#t lo n ho n mo# t chu t so vo i ca c ma u nga m trong nu o c ma# n. Su # a n mo�
n cu a co t the p cho n trong be to ng su du#ng ca t bie n tie n trie n kho ng a ng ke sau khi ba o du o ng 180 nga�
y trong nu o c ma# n., To m ta t tie ng anh, This study aimed to examine interfacial bond strength between steel bar and concrete using sea sand at Phu Quoc, Kie n Giang province under various curing environment. Total 120 cylinder specimens with embedded steel bar were experienced under pullout test. The testing parameters included concrete grade (M200 and M350), sand type (river sand and sea sand), curing time (7, 14, 28, 90 and 180 days), and curing enviroment (normal water and sea water). The results showed that there was no significant different in interfacial bond strength between normal sand and sea sand until 180 days testing. The interfacial bond strength enhanced rapidly from 7 days to 28 days but increased slowly from 28 days to 180 days. The interfacial bond strength of specimens cured in normal water was slighlty higher than those cured in sea water. The corrosion of steel bar embedded in concrete using sea sand has not progressed significantly after 180 days cured in sea water.