The increased surface area of manufactured aggregates (e.g. crushed stone) contributes to a more fluid and flowable concrete in its fresh state.  True False

please answer d,e,f

Please  answer the problem. You can summarize your answer. Thank you and Godbless. Comment on the results. Compare the results with the typical values. How can the percentage of absorption affect on a concrete mix?

Which of the following is NOT a benefit of using SCMs? Increase required concrete curing time Increase long term strength Reduce permeability Increase the resistance to chloride ions

The flexural strength (fr) of concrete measured from the bending test is always higher than the direct tensile strength (ft). In reality, the stress in the cracked part of the concrete is lower than ft. Also, failure may occur on the compressive side. Assuming NO tension softening (i.e., the stress in the cracked part stays at ft) and infinite compressive strength (i.e., compressive failure will never occur), draw the stress distribution over the depth of the beam at ultimate failure when the curvature of the section is approaching infinity. With this stress distribution, show that the upper bound of fr/ft is equal to 3.   (Hint: On rotating the section, because the compressive stress can increase well beyond ft, the neutral axis will continue to shift upwards.)

For a design a concrete mix which is going to be used in Muğla the 28-day compressive strength of the concrete is required to be 30 MPa and slump of the fresh concrete is specified as 8-10 cm. Maximum size of the aggregate is 25 mm. Other necessary data are given as: Specific gravity of cement = 3.1 Bulk specific gravity of coarse aggregate = 2.68 Bulk specific gravity of fine aggregate = 2.64 Absorption capacity of both aggregates is 1.5% Fineness modulus of fine aggregate = 2.8 Dry rodded unit weight of the coarse aggregate = 1600 kg/m³ According to ACI 211 and based on absolute volumes: What should be the weight of SSD coarse aggregate in kg's? What should be the amount of mixing water in kg's? What should be the water to cement ratio? What should be the volume of dry rodded coarse aggregate per unit volume of concrete? What should be the air content in 96? What should be the SSD weight of fine aggregate in kg's? Seç Seç... Seç Seç... # Seç + Seç... # # + ÷