Question

There are concrete structures and projects in the following, try to select the proper cement and explain the reason
1/Cast in place beam
2/The prefabricate parta conserved by autoclave method
3/Urgent salvaging projects or urgent military engineering
4/Mass concrete dam and the Foundation fpr large scale equipment
5/The underground Engineering that can be corroded by sulfate
6/The basis for blast furnace

Answer 1

Before we begin with the solution,

let's discuss ordinary portland cement(OPC) it is generalized by its characteristic property which depends on Bogues Compounds.

Classification as:-

Tricalcium Silicate(C3S ) - Responsible for early strength of concrete

Dia calcium silicate(C2S ) - Low heat property

Tri Calcium Aluminate(C3A) - Monitor Cement and Shrinkage Setting time

Tetra calcium Alumino Ferrate(C4AF) - Strength contribution almost very low but control setting time.

*Different types of cement is a mixture of Bogues Compounds proportion concerning there use.

1. For Cast in place beam

Cast-in-place concrete, also known as poured-in-place concrete, is a concreting process carried out in situ

:-Type I or ordinary Portland cement

This form of cement is available almost anywhere and this cement meets the requirement of ordinary reinforced concrete structure.

2.For the prefabricate parts conserved by autoclave method

:- Slag cement

this type of cement slow setting and hardening and low early strength along with high later strength which can be best suitable for prefabricating parts

3. For urgent salvaging projects or urgent military engineering

whenever work is related to military engineering it becomes an emergency project, where completion time is not like the ordinary project, hence

:-Portland cement

which helps structure for fast hardening rate with high cement.

4. For mass concrete dam and the Foundation for large scale equipment

as name suggest mass, where the concrete requirement is huge ultimately which causes high heat of hydration, hence

:-Type IV or Low heat portland cement or masonry cement

in this type of concrete, the amount and rate of heat generation must be kept to a minimum.

5.For the underground Engineering that can be corroded by sulfate

:-Sulfate resistant portland cement or portland cement

It is used in coastal areas and aquatic habitats, or where sulfates are likely to influence the structure

6.For the basis for blast furnace

Blast applies to "led" or supplied by the combustion air above ambient pressure, for such cases

:-blast furnace cement (Standard EN 197-1:2000)

this type of cement meets all the requirements to make durable concrete