Question $2(20$ Marks$)$

a$)$ From the knowledge of the effects of GGBS$,$ PFA and microsilica, indicate whether their inclusion to provide a concrete of equivalent $28$ day strength, is likely to enhance or reduce resistance to each of the processes in sulphate attack and ASR in concrete.

$(10$ marks$)$

b$)$ You are involved as a concrete specialist in the construction of an office building in Scotland, United Kingdom, which is having frost and cold weather conditions. These conditions will definitely have adverse effects on the setting characteristic of cement and concrete. Explain the potential adverse effects of these conditions on concrete. By giving appropriate justification, propose a type of chemical admixture that you will consider be used in the construction of the building.

$(10$ marks$)$