Method for measuring tensile strength and fracture toughness of cement mortar or concrete
A technology of concrete strength and cement mortar, which is applied in the direction of applying stable tension/pressure to test material strength, preparation of test samples, and measurement devices, etc., to achieve the effect of reducing difficulty, reducing workload, and sufficient accuracy
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[0045] Example 1: The maximum particle size d of cement mortar aggregate used in the test of Example 1 max =2.5mm. Divided into two series: the first series L×B×W=400×50×100mm, initial seam height ratio α=a 0 / W=0.03~0.72, W / d max = 40. The second series L×B×W=240×50×60mm, initial seam height ratio α=a 0 / W=0.04~0.68, W / d max = 24.
[0046] See figure 1 Considering that cement mortar is a quasi-brittle material, the stress distribution at peak load is as figure 1 As shown, the corresponding crack propagation amount Δa fic =γ·d max . Based on the following formula (2), the measured peak load P max , The nominal strength σ of each specimen can be calculated n :
[0047]
[0048] Considering γ=1.0 from a statistical point of view, the average value of tensile strength and fracture toughness of cement mortar can be calculated, see figure 2 a. Considering the discrete problem of cement mortar test results and solving it accurately, γ=0.2,0.4,0.6,0.8...2.0 can be obtained, an...
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[0061] Example 2: The maximum particle size d of concrete aggregate used in the test of Example 2 max =19mm. Specimen size L×B×W=1143×76.2×305mm, initial seam height ratio α=a 0 / W=0.36~0.68, W / d max = 16.
[0062] The stress distribution of the specimen under peak load is as figure 1 As shown, the corresponding crack propagation amount Δa fic =γ·d max . Based on formula (2), the nominal strength σ of each specimen can be calculated from the measured peak load n .
[0063] Considering γ=1.0 from a statistical point of view, the average value of concrete tensile strength and fracture toughness can be calculated. Considering the discreteness of concrete test results and accurately solving it, set γ=0.6,0.8...2.0, and calculate the precise values of concrete tensile strength and fracture toughness.
[0064] The equivalent crack length of each specimen a e It can be calculated by formulas (3a) ~ (3d).
[0065] Get different σ n With a e After that, the equation (1) is used for r...
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