| High-performance fiber-reinforced cementitious composite (HPFRCC) has been used to thicken the upper surface of bridge deck slabs. However、 block cracking of such slabs was observed on a single-plane cable-stayed bridge. [*]The cracking was attributed to water exposure. The main span had received little water influence and had only small-scale deterioration. In repairing the main span、 only the deteriorated deck material was removed and replaced with new concrete. When the new concrete was placed、 a fiber sheet and layers of waterproofing material were also installed to mitigate the effects of the block cracking and water exposure. The side span、 however、 had been much more exposed to water than the main span had been、 so the HPFRCC deck there had deteriorated more widely and severely. The side span required large-scale、 high-cost repairs with long-term lane closure. For repair of the side span、 the HPFRCC was replaced with asphalt concrete for the upper surface of deck while a new repair method of thickening the lower surface with HPFRCC was experimentally used for the lower surface of the deck. [*]This study reports on 1) our examination of the installation and results of the proposed repair method for the upper surface of the deck and 2) the results of lab tests and computer analyses of our proposed method for the lower surface of the deck. |
