high strength concrete beams without shear reinforcement. Keywords: High strength Concrete, Shear, Shear span to Depth Ratio (a/d). 1. Introduction Use of high strength concrete in construction sector, has increased due to its improved mechanical properties compared to ordinary concrete.
concrete and shear strength of reinforced concrete (RC) beams made from Portland blastfurnace slag cement type B. The PCCA, which has a crushing value of 20% and a high water absorption of approximately 9%, has been reported to be effective in mitigating autogenous shrinkages and improving the mechanical properties of concrete.
By and large, strength of concrete produced from crushed concrete aggregate is lower than concrete made using natural aggregate. Strength reduction of concrete produced from recycled coarse aggregate and natural fine aggregate ranges from 5 to 24%.
However maximum compressive strength is at % of PFRC. This may be due to large pozzalanic reaction and improved interfacial bond between paste and aggregate. For all grades of concrete with incorporation of % of fiber the compressive strength is found as .
although somewhat marginal, strength characteristics comparable to those of CFM. The derived effective shear strength parameters for RAP were: c′=8 psi, ϕ′=37°. Because these tests were strain controlled, they do not include the effects of creep. The largescale direct shear tests, which are force controlled, could not be successfully
root and others use the cube root of the compressive strength of concrete to determine the shear strength of beam. Therefore, to normalize the data for comparison, the shear strengths were divided by the square and cube root of the compressive strengths of concretes. Parametric test The paired ttest is a statistical technique used to compare two
Compared with normal concrete, the maximum increase of the reinforced concrete with steel fiber SQB 32 (Ⅱ) is listed, which compressive, tensile and flexural .
Jun 22, 2017· The shear strength of the concrete–rock interface is a key factor to justify the stability of a hydraulic structure foundation. The Mohr–Coulomb failure criterion is usually used as shear strength and evaluated by extrapolating shear tests results carried out in a laboratory on smallsized samples.
Shear Strength: The shear strength of RAP that has been crushed and sized will be based on internal friction, with little or no cohesion, and should be comparable to that of a similarly graded natural aggregate. RAPaggregate blends should also have an internal friction angle in the same range as the natural aggregate.
The concrete strength is affected by the shape and size of the specimens, but high strength concretes is less affected than the low strength. Concrete shows the influence of height/diameter ratio on the strength of cylinder for different strength of concrete as suggested by Murdok and Kesler.
shear strength can vary drastically depending on the beam geometry and material properties. For example, in tests reported by Narayanan and Darwish,13 the increase in shear strength attributable to steel fibers varied from 13 to 170%. As with conventional reinforced concrete beams, 2224 the ultimate shear strength decreases with increasing shear span
Where Vc is called as shear strength of concrete and Vs is the shear resistance of web reinforcement. 4. Factors affecting Shear Strength Beams without web reinforcement will fail when inclined cracking occurs or shortly afterwards. For this reason, the shear capacity of such members is taken equal to the inclined cracking shear.
shear strength is also dependent on the a/d ratio of the beam (Mphonde and Frantz 1984). This paper summarizes results of an experimental program that examined the effect of concrete strength and a/d ratio on diagonal cracking shear strength and ultimate shear capacity of nine reinforced concrete beams without web reinforcement. 2.
The tests were conducted on crushed concrete and demolition debris in a 300 mm×300 mm×179 mm shear box, and the results were compared with those of a limestone aggregate.
Shear Capacity of Steel Fibre Reinforced Concrete Beams without Conventional Shear Reinforcement (Civil Project) While the increase in shear strength of Steel Fibre Reinforced Concrete (SFRC) is well recognized, it has yet to be found common application of this material in...
Jun 06, 2017· The steel faceplates prevented spalling of the crushed concrete and as a result, the wall specimens had stable hysteretic loops and large sheardeformation capacity. Using vertical stiffeners and tie battens as connectors further increased the sheardeformation capacity of the wall specimens, with the ultimate shear strain reaching 3%.