King Fahd University of Petroleum and Minerals

Department of Civil Engineering

CE-303

Term-52

H.W Assignment # 3

Instructor: Dr. Salah Othman Al-Dulaijan

Student Name: _____________________________________________________

Student ID #:______________________________________________________

**Do a proportion for a trial mixture that will meet the
following conditions and specifications.**

**Conditions and Specifications:** Concrete is required for a pavement
that will be exposed to chlorides from seawater. A specified compressive
strength, f'_{c}, of 40 MPa is required at 28
days. Slump should be between 25 mm and 75 mm. A nominal maximum size aggregate
of 25 mm is required. No statistical data on previous mixes are available. The
materials available are as follows:

**Cement: Type** I with relative density of 3.0.

**Coarse aggregate:** Well graded, 25-mm nominal maximum-size rounded
gravel with ovendry relative density of 2.7,
absorption of 0.5% and ovendry rodded
bulk density of 1700Kg/m^{3}. The laboratory sample for trial batching
has a moisture content of 1.5%.

**Fine aggregate:** Natural sand with oven-dry relative density of 2.60
and absorption of 0.6%. The laboratory sample moisture content is 5%. The
fineness modulus is 2.80.

**Water reducer:** reduces water demand by 10% when used at a dosage
rate of 4 g per Kg of cement. Assume that density is that of water.

**Due date: ****Saturday, May 6 ^{th} 2006**