Hochfester Aufbeton zur Tragwerksverstärkung

Abstract

High strength concrete overlays -Part 2: Member testsSmall scale and member tests with different specimen geometries and test setups were performed to investigate the adhesive bond along interfaces between normal strength concrete and high strength overlay. Part 1 reports about the small scale tests, while this part 2 focuses on slab tests. Apart from standard application of normal and high strength concrete layers, two slabs were subject to cyclic loading during casting the concrete overlay. In general, also the member tests confirm the improvement of the bond properties with the high strength concrete overlay. All slabs with normal strength overlay concrete depicted some limited degradation along the shear interface in the tests, while members reinforced with high strength concrete showed hardly any degradation along the joint except for the slabs that underwent cyclic loading during overlay casting.

Shear bond between existing concrete and high‐strength fiber reinforced overlay: Influence of substrate strength and interface roughness

“…The interface roughness plays a major role only when the shear critical crack develops through the interface. Moreover, among recent published studies, [25][26][27] Chilwesa et al 25 investigated the influence of substrate surface roughness on interface bond strength through a new bond test setup and highlighted some limitations of the bond test methods. It should eventually be observed that most of these studies generally do not consider high or ultra-high performance fiber reinforced concrete (HPFRC or UHPFRC) as a repair material.…”

Strengthening of Concrete Structures Using UHPC - Experimental Verification

“…From all these reasons UHPC becomes a suitable material for strengthening of existing structures. High mechanical properties guarantee that a thin additional layer to existing concrete increases load carrying capacity of existing concrete element and the added weight of new concrete (UHPC) will be rather limited [1,2,3,4]. An added thin layer also will not significantly influence the inside space, the height of rooms in buildings will be reduced only very little.…”