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The effect of a steel fiber and silica fume on the first-crack strength and the flexural toughness of concrete is evaluated. The ten sets of specimens with a steel fiber content of 0, 40, 50, and 60 g/m3 and steel fiber types of wave shear and straight shear types with and without a silica fume content of a 10% replacement of the cement weight were tested. The results show that the combined effect...
For original paper see S.K. Oh and C.K. Un, ibid., vol.25, p.1325-6 (1989). By using the properties of the minimum norm spectral estimator, the original authors propose an efficient iterative ML algorithm that transforms quadratic forms in the AP algorithm into inner products of vectors for reducing the number of iterations to convergence by improving the initial estimates. The idea is very good....
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