Temperature related pull-out performance of chemical anchor bolts in fibre concrete

Abstract

Anchor bolts are often fixed into a concrete soffit of structures and they are used in ambient and cold store locations. The chemical anchor bolt relies purely on the tensile strength of the concrete to carry the imposed load, assuming the bond strength of the resin is greater than the tensile strength of the concrete. The properties of concrete are changed by the addition of both steel and polypropylene fibres. This paper investigates the relative performance of each fibre type with regard to initial and final post crack failure. Anchor bolt pull-out testing was used to determine the maximum load a fixing can hold as well as the residual post crack toughness of a bolt embedded in a concrete block. The concrete used was a C40 design mix and resin anchor bolts were selected for this test for their stress-free conditions prior to loading. The results showed that the addition of both types of fibres when used in concrete improved the maximum load and toughness of the samples, compared to plain concrete. There was not a significant difference between the results obtained for steel and polypropylene fibres. The effects of a reduction in core temperature of the samples was examined. The results show that the strength of concrete is significantly improved when tested at-20°C, compared to ambient temperature.

An Analytical Study on the Pull-Out Strength of Anchor Bolts Embedded in Concrete Members by SPH Method

“…Therefore, non-linear Drucker-Prager's yield function which improves linear Drucker-Prager's equation is applied in this study. Non-linear Drucker-Prager yield function applied in this research is represented by the following Equation (7).…”

“…Under these backgrounds, many researchers have already conducted the research on the pull-out fracture of anchor bolts. For example, there are experimental studies [5,[7][8][9], some of them focusing on the damage of the base concrete [10,11], and others focusing on the bond fracture between concrete and anchor bolt [12,13], and studies focusing on the long-term strength against aging performance [14].…”

Effect of synthetic zeolite on tobermorite synthesis

“…Another study has shown that the reinforcements placed in the same spot as the installed anchors, had the direct impact on the axial tensile capacity (19). There are also other studies that use the temperature as a variable (20)(21)(22). Also, examined by empirical observation, the concrete edge failure of the single and group anchors, after fi re exposure by Tian et al (23).…”

Effect of concrete edge distance on the hysteretic response of roof joint

“…It was found that with increasing edge distance, concrete edges become more resistant to failure. Richardson et al, [ 32 ] Nilforoush et al, [ 33 ] and Kocur et al [ 34 ] conducted tests on steel and synthetic fiber concrete. Concrete edge failure was observed in most of the tests.…”