There are many factors that affect the compressive strength of concrete. The relationship between compressive strength and these factors is a complex nonlinear problem. Empirical formulas commonly used to predic
This formula, containing cementing efficiency factor, , of FA, is useful also when the quantity of FA used is more than that of sand replaced. Application of the formula to the test data in published literature, indicate that it can estimate the compressive strength of concrete containing ...
especially the RCS after elevated temperatures exposure, are quite few in number yet. In addition, studies related to predicting the behavior of concrete reinforced with nano additives, particularly its compressive strength, are extremely rare. The positive...
Based on the above considerations, developing reliable predictive models for the compressive strength and ultimate strain of the FRCM confined concrete is not easy with respect to the case of the FRPs since these models should account for all the mentioned physical and behavioral aspects and their ...
Based on the investigations, a simple formula for predicting the ultimate strength of CFT stub columns is proposed. The concrete confinement, which depends mainly on the ratio of the external diameter of the steel tube to the plate thickness, the yield stress of the steel tube, and the ...
For example, researchers have developed ANN models to predict concrete punching shear strength, but the predicted values do not match those derived from the design codes because of overfitting22. The intricate nature of these models not only complicates their implementation but also renders them ...
the course of a specific project has the same compressive strength when it has the same “maturity index”. It means that a given concrete mix formula or mix, for example, may reach the same compressive strength after 7 days of curing at 10 °C when it is cured at 25 °C for 3 ...
compressive strength are not available yet. However, the formulation proposed for concrete in the Model Code 90 may be used. This code proposes a peak strain of 0.2% and a compressive fracture energy ofGf=15+0.43fc−0.0036fc2. It should be noted that this formula is only applicable for ...
compressive strength are not available yet. However, the formulation proposed for concrete in the Model Code 90 may be used. This code proposes a peak strain of 0.2% and a compressive fracture energy ofGf=15+0.43fc−0.0036fc2. It should be noted that this formula is only applicable for ...
5) axial compressive strength 轴压强度 1. In order to establish theaxial compressive strengthformula for CFST composite columns, axial compressive loading tests of 18 specimens have been carried out. 试验结果表明:钢管混凝土叠合柱的轴压强度可由钢管混凝土强度和管外钢筋混凝土强度两部分叠加而成,从而给...