Effect of size on biaxial flexural strength for cement-based materials by using a triangular plate method

doi:10.1007/s11709-022-0871-8

Front. Struct. Civ. Eng.

2022, Vol. 16

Issue (8) : 1017-1028 https://doi.org/10.1007/s11709-022-0871-8

RESEARCH ARTICLE

Effect of size on biaxial flexural strength for cement-based materials by using a triangular plate method

Hakan T TURKER(

)

Department of Civil Engineering, Bursa Uludag University, Bursa 16059, Turkey

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Abstract

The effect of size on the biaxial flexural strength (BFS) of Portland cement mortar was investigated by using the recently proposed triangular plate method (TPM). An experimental program was conceived to study the size effect by keeping a constant water-cement ratio of 0.485, cement-sand ratio of 1:2.75, and using unreinforced triangular mortar plates of five different thicknesses and seven different side lengths. The BFS of the produced specimens was tested, and variations of BFS depending on specimen thickness and side length were determined. The results indicated that increases in triangular plate specimen side length and specimen thickness led to a decrease in the BFS of Portland cement mortar. The effect of specimen length increase on BFS was more significant than on the effect of the specimen thickness. The variations in specimens’ thickness indicated a deterministic Type I size effect, while the variations in specimens’ length showed an energetic-statistical Type I size effect.

Keywords testing apparatus & methods plain concrete tensile properties biaxial flexural strength triangular plate method

Corresponding Author(s): Hakan T TURKER

Just Accepted Date: 09 September 2022 Online First Date: 02 November 2022 Issue Date: 02 December 2022

Cite this article:

Hakan T TURKER. Effect of size on biaxial flexural strength for cement-based materials by using a triangular plate method[J]. Front. Struct. Civ. Eng., 2022, 16(8): 1017-1028.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0871-8
https://academic.hep.com.cn/fsce/EN/Y2022/V16/I8/1017

Fig.1 Geometry of the triangular plate specimen and loading base plate.

Fig.2 (a) Schematic demonstrations of testing configuration and (b) testing of a triangular plate.

Fig.3 Accepted failure mechanisms for ultimate load capacity.

Fig.4 Maximum stress fields in a triangular plate.

Fig.5 Maximum stresses along the yield line.

Fig.6 Normalized maximum stresses along the yield line.

Fig.7 Cracking pattern on tension surface at ultimate load.

Tab.1 Dimensions of equilateral triangular specimens used for size effect

Fig.8 Failure pattern of a typical prism specimen under three-point bending test.

Fig.9 Failure patterns of samples of the equilateral triangular specimens. (a) Symmetric triple cracks; (b) symmetric triple cracks; (c) straight crack; (d) typical fracture pattern of a group of the tests.

Tab.2 Experimental test results for validation of TPM (given in Turker [13])

Tab.3 Test results of first group

Tab.4 Test results of second group

Fig.10 Mean nominal biaxial flexural strength. (a) Variation due to the specimen thickness; (b) percent reduction.

Fig.11 Predictive size effect curves and experimental results of biaxial flexural strength variation due to the specimen thickness.

Fig.12 Mean nominal biaxial flexural strength. (a) Variation due to the side length; (b) percent reduction.

Fig.13 Predictive size effect curves and experimental results of biaxial flexural strength variation due to the side length.

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