| 摘要 |
<p>The present invention relates to a contraction reducing agent including polyalkylene glycol, a material separating resistant agent and an air amount reducing agent, and a concrete or mortar composition including the same. In chemical formula 1, C_4H_9 is linear or non-linear, and n is integer between 2 and 4. The mortar or concrete composition is added with the contraction reducing agent of the present invention and accordingly prevents low strength earlier and separation of materials while having low dried contraction amounts and high strength, thereby inhibiting cracks on the cured concrete and having good freezing inside and good melting.</p> |
