Comparative Analysis of Oblique Bonded Anchors with Point Anchors Fixed in the Concrete Structural Layer of Buildings of a Large Slab
Jerzy K. Szlendak , Agnieszka Jabłońska-Krysiewicz , Dariusz Tomaszewicz
AbstractThe subject of the article is derived from the current problem, the scope of which applies to the whole of Poland, namely the risk of detachment of the external textured layer in external three-layer walls. Works are being carried out to increase the durability of fixing the textured layer before thermal insulation. The issues discussed in the article are aimed at determining the variant ensuring the longest durability of fixing. The subject of this article is bonded anchors at 60°, 45° and 30°. The load-bearing capacity of these anchors was compared with the results of point anchorages obtained from previous experimental tests. The tests were carried out on samples made of two concrete classes: C12/15 and C30/37. Two types of resin were also used: R-KER and Sika AnchorFix-1. A total of 12 samples were tested, 4 for each angle. In the case of anchors at 60° and 45° angles, three-layer samples with two concrete layers and thermal insulation in the form of expanded polystyrene were used (a 5 cm thick texture layer, a 6 cm thick thermal layer and a 6 cm thick construction layer). Samples with 30° anchorages were made as one-layer (construction layer 6 cm thick). In samples of concrete class C 30/37, only partial anchoring of the anchorage was made only in the construction layer, which is the fixing factor for the textured layer. The test results were quite varied, which was influenced not only by the concrete and resin parameters, but also by the angle of inclination and the length of the anchorage. For 60° anchorages in C 12/15 concrete, breaking forces of 11. 25 kN and 9.1 kN respectively were obtained with anchors glued through the Sika AnchorFix-1 resin. In the case of C 30/37 concrete, the breaking forces were very low due to "Partial" fixing with R-KER resin resulting in a lack of greater resistance and had values of 0.6 kN and 2.9 kN. In the case of 45° anchorages fixed with Sika AnchorFix-1 resin in C 12/15 concrete, breaking forces of anchorages were obtained: 3.5 kN and 4.2 kN, while in class C 30/37 concrete using R-KER resin values: 1.7 kN and 1.3 kN. Tests of anchors fixed at an angle of 30° were checked only in the structural layer of the gr. 6 cm without additional layers in a cross-shaped way, i.e. both resins were applied to both classes of concrete samples. The results were as follows: for the Sika AnchorFix-1 resin in C 12/15 concrete, the value of 10.6 kN was obtained, whereas in concrete C 30/37 27.6 kN. Using R-KER resin was obtained: in C 12/15 11.9 kN concrete, while in concrete C 30/37 30.5 kN. All attempts resulted in the destruction of the concrete surface. The results of anchoring studies have led to the conclusion, that the use of a resin with better strength parameters in samples from lower-class concrete gave better results of testing the anchoring capacity of the anchors than in the opposite case.
|Journal series||IOP Conference Series: Materials Science and Engineering, ISSN , e-ISSN 1757-899X, (0 pkt)|
|Publication size in sheets||0.5|
|Conference||World Multidisciplinary Civil Engineering - Architecture - Urban Planning Symposium (WMCAUS 2018), 18-06-2018 - 22-06-2018, Prague, Czechy|
|License||Journal (articles only); published final; ; with publication|
|Score|| = 15.0, 11-07-2019, manual|
= 5.0, 26-02-2020, ArticleFromConference
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