TY  - JOUR
T1  - Effect of Polycarboxylate Superplasticizer Dosage on the Mechanical
Performance of Roller Compacted Rubbercrete for Pavement Applications
AU - Adamu, Musa AU - Mohammed, Bashar S. AU - Shafiq, Nasir 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 20
SP  - 5253
EP  - 5260
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.5253.5260
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.5253.5260
KW  - Crumb rubber
KW  -superplasticizer
KW  -roller compacted rubbercrete
KW  -vebe consistency
KW  -compressive strength
KW  -flexural strength
AB  - Roller Compacted Concrete (RCC) is a special type of dry mixed concrete having similar ingredients
and properties as conventional concrete but with lower water/cement, lower paste content, higher fine
aggregate content. RCC should be made in such a way that they will be easier to compact and should have
adequate properties for the roller compaction. The best strength in RCC is obtained when the optimum
compaction is achieved and this condition can only be attained at the wettest mix that can be able to support
vibratory roller without sinking. Water reducing admixtures has been used in RCC to increase its consistency
by helping in the distribution of the little paste content, lower its water/cement ratio and improve its strength.
In this study, the effect of superplasticizer dosage on the properties of Roller Compacted Rubbercrete (RCR)
made by partial replacement of fine aggregate with crumb rubber in Roller Compacted Concrete (RCC) pavement
was studied. Superplasticizer was added at 0, 1 and 2% by weight of cementitious materials and fine aggregate
was replaced with crumb rubber at 0, 10, 20 and 30%. The results showed that crumb rubber decreases
consistency and compressive strength of RCR and increases its flexural strength. Similarly, addition of
superplasticizer further decreases consistency of RCR and increases its compressive strength. In addition, the
flexural strength of RCR increases with addition of 1% superplasticizer and decreases with addition 2%
superplasticizer. The recommended dosage of superplasticizer for use in RCR is 1% by weight of cementitious
materials.
ER  -