Rubber included cement concrete has been found to have better performance in crackingresistance, frost resistance, toughness etc than ordinary cement concrete. However, seldomresearch has been conducted to reveal the effect of rubber particles on the stress involvementof cement concrete. The current investigation aims to compare the internal stress involvementof restrained rubber included cement concrete and ordinary cement concrete at early ages. Anew method using strain gauge stick to the surface of soft rubber piece was used to monitorthe strain development of rubber piece inside concrete, and then the strain was transferred tostress of concrete. Four slabs were cast, two of them were cured under controlled indoorenvironment and two were cured outdoor. Results show that the internal stress developed inrestrained rubber included concrete was lower than that in ordinary cement concrete, thoughthe free dry shrinkage of the former was higher than that of the latter. The stress relaxationeffect due to the low elastic modulus of rubber included concrete may account for this result.
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