CONCRETE
-artificial stone composed of cement,sand, gravel, water and in earth.


Blocks of concrete



Types of Concrete
1. plain

2. Reinforce

Cement and sand ready to be mixed.



Types of Concrete
1. Slum test

2. Compression Test


Installing rebar in a floor slab during a concrete pour


Materials for Concrete
1. Cement- is an hydrolic cement

Types of Cement
-premium-1st class.3-7 days setting

-pozzoland- 2nd class .7-20 days setting

-aggregates-universal term for sand and gravel


2.Water- it should not be contaminated
3. Forms- without the form, the concrete will be reshape
4.tie wire- # 16



A concrete slab pounded while curing.


Types of Concrete and their Weight
1. Light Weight
classified into 3 types
a. low density concrete=50
b. moderate strength concrete-360-960kg
c. structural concrete- the same characteristics of medium stone

2. Medium Stone- 1440-1920kg
3. Heavy Weight- shielding from radiation

Concrete columns curing while wrapped in plastic.