Q1)
For high strength and high durability concrete , the
considerations in the mix design are
- The w/c ratio -Water cement ratio is an important
parameter in setting the strength of concrete as Lower the w/c
ratio , higher is the strength of concrete and higher the w/c ratio
, lower is the strength of concrete. In concrete with higher water
cement ratio, water added is more whereas in concrete with low
water cement ratio , the water added is less.
- Admixtures - Admixtures are substances which enhance
the property of concrete , provided suitable admixtures are used .
Admixtures like plasticizers can improve the strength as well as
durability of concrete.
Q2)
For Sustainable steel structures , the design
considerations are
- Proper Planning - The main objective of sustainable
design is to lessen the use of energy , avoid wastage of water and
other natural resources , lessen the overall cost etc. Proper
planning of the structure can help in achieving the objectives of a
sustainable design .
- Waste minimization - Steel is a reusable component ,
if the building is to be demolished after some time , reusable
components can be used. Welding of steel attaches steel components
in a permanent way and may cause wastage when they are separated
afterwards , usage of bolts for fastening or attaching steel
components to one another can minimize waste .Such ideas need to be
implemented to make the idea of sustainable design a success.
I hope I was able to answer your questions , if you have any
doubts , please let me know in the comment section.
If you like this answer , please upvote it , Have a nice day
:)