Normal Concrete Mix Design based on the Isoresponse of Slump as a Function of Specific Surface Area of Aggregate and Cement Paste-Aggregate Ratio
Many methods of normal concrete mix design produce the same proportion of cement and water content of concrete for different specific surface area of aggregate. Therefore, they often produce inappropriate workability of fresh concrete in the first batch. In the end, several trial batch adjustmen...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universitas Indonesia
2021-07-01
|
| Series: | International Journal of Technology |
| Subjects: | |
| Online Access: | https://ijtech.eng.ui.ac.id/article/view/3355 |
| Summary: | Many methods of normal concrete mix design produce
the same proportion of cement and water content of concrete for different
specific surface area of aggregate. Therefore, they often produce inappropriate
workability of fresh concrete in the first batch. In the end, several trial
batch adjustments are required by increasing or decreasing cement paste for
reaching the required slump. This research aims to find out the correlation
between specific surface area of aggregate and cement paste-aggregate ratio
(C/A) to slump in a constant water-cement ratio (W/C) in normal concrete. This
correlation will be used as an alternative method of normal concrete mix
design. First, the new fine aggregate was established by modifying natural fine
aggregate gradation. Then, two reference mixtures with these natural and
modified fine aggregates were designed based on SNI 03-2834-2000. From each of
these mixtures, the water content was added and reduced at multiple of 10 kg/m3
in a constant water-cement ratio until the measured slumps of samples had
approached or reached 6 and 18 cm. Thus, different specific surface area of
aggregate, cement paste-aggregate ratio, and slump could be known. Then, an
isoresponse is developed to present the correlation between these variables.
Finally, other mixtures are designed based on this isoresponse to validate it.
The isoresponse is considered satisfactory if the measured slump of the
validation mixtures does not deviate more than 2 cm of the required slump. The
result shows that the measured slumps of validation mixtures had maximum
deviations of 1 cm only. It means that the isoresponse of slump as a function
of specific surface area of aggregate and cement paste-aggregate ratio can be
used to predict the slump of a mixture and also as an alternative method of
normal concrete mix design. |
|---|---|
| ISSN: | 2086-9614 2087-2100 |