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In order to conduct this study steps like data
collection, analysis, laboratory test, development of strength-duration curve
etc measures are measured. The whole procedure is divided into three stages:
- Pre-stage
- Working stage
- Observation and measurement stage
Pre-stage:
In this stage selection of materials is used. Here
we used selection of fine aggregate and binding materials. As fine aggregate we
selected Sylhet Sand and as binding materials we selected Shah Cement.
Working
stage: In this stage following steps are followed:
- Mixing materials
- Preparing sample
- Curing and Testing
Mixing
materials:
While mixing materials we used water-cement ratio
(w/c) 0.485 as fixed for all samples. We used three verities of mix design as
1:2.5, 1:3 and 1:3.5.
Preparing
sample:
For these purposes the compressive strength of 2”x2”
mortar we used.
Curing
and Testing:
Curing is the name given to procedure used for
promoting the hydration of cement and consists of control of temperatures and
of the moisture movement from and into the mortar. The object of curing is to
keep mortar saturated so that hydration of cement can take place in a suitable
environment. The curing for 28 days imparts maximum strength of mortar (Aziz,
1995).
Observation
and measurement stage:
We took compressive strength in Mpa for 3 days, 7
days, 14 days and 28 days.