The shrinkage cracks of Portland cement mortar and cement concrete are obviously reduced when combined with MgO,2.1.2.1.2. Mixture of shrinkage (hormone) and superabsorbent polymer (SAP). The problem with using these materials is that MgO is a solid that reacts with water, MgO is a liquid, and SAP can drain water out of the system if it is not added properly, thus increasing rather than reducing shrinkage. This is not a small problem because in order to avoid adverse effects on performance, there is a limit to the maximum number of materials that may exist,Since it is difficult to combine these materials into useful proportions, a balance must be maintained. This unique mixture can be used as a supplementary material for cement because they do not have a significant impact on the resistance of the cement or Portland cement itself. The appropriate combination of MgO (MgO) y / O sap, when mixed to the appropriate proportion,they also perform better against cracking reduction compared to commonly used expansive cements (EC). Claim 14: A flowable dry powder comprising magnesium oxide including light calcined material at temperatures ranging from about 750 ° C to about 1,200ºC; and a mixture of shrinkage reduction and SRA.
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