Determine the batch quantities for a concrete mix design to have a 28-day compressive strength of 4000 psi, using sub-angular aggregate .The fine aggregate has a fineness modulus of 2.5. The concrete is used in severe weather, however we will use non-air entrained. A slump of 3 in is desired. Use a 350 psi standard deviations of compressive strength of concrete (more than 30 samples).

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?