(Solved): Answer "True" or "False"! If false, give a reason in detail If it false give a reason 1 Fresh state ...

Answer "True" or "False"! If false, give a reason in detail If it false give a reason 1 Fresh state starts from mixing until casting or placing which usually takes around first 3 hours. Concrete in this stage behaves like colloidal liquid. 2 The increasing in water content mitigates the risk of segregation. 3 As cement hydration proceed, the products of the hydration process gradually bond together the individual sand and gravel to form a solid mass. While water is consumed from the progress of hydration reaction. 4 Vibration must be strictly provided to ensure good compaction of concrete in the formwork. 5 Curing is not necessary for the concrete with very high water-to-cement ratio. 6 In slump test, the change of diameter of concrete is measured. 7 Bleeding is a segregation between water and solid particles resulted in rising of water to the surface of freshly placed concrete. \( 8 \mathrm{Fly} \) ash enhances cement hydration. Therefore, the presence of fly ash in mass concrete increases the risk of thermal crack formation. 9 High strength concrete should be cured at an early age as partial hydration may make the capillaries discontinuous: causing cement in the inner part remains unhydrated. 10 Cement hydration is considered as exothermic process.