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3. In a Cement Mortar mix or a Cement concrete mix, what type of admixtures can be used so that workability of mix increases and at the same time the strength properties are not decreased due to excessive water? Discuss how those admixtures work? 4. Determine the required volumes of ingredients to make a 1 m³ batch of air-entrained concrete mix with a nominal maximum gravel size of 12.5 mm. [Hint: Use Table 7.12 from textbook] 5. A cylindrical steel alloy rod with a 0.5 in. diameter is subjected to tension. Determine the magnitude of the load required to produce 104 in. change in diameter if the deformation is entirely elastic. Assume modulus of elasticity 30 x 105 psi and Poisson's ratio of 0.27.