Admixture and method for optimizing addition of EO/PO superplasticizer to concrete containing smectite clay-containing aggregates

摘要

The present invention relates to a method for producing an aqueous cement composition further comprises a smectite clay which expands when included, and also in contact with the water the plasticizer, such as EO / PO polymer-containing plasticizer, or EO / PO comb polymer containing a plasticizer, a clay the plasticizer absorption capacity relates to a method comprising providing a reagent for modifying the clay to decrease. ; In the exemplary method of the present invention, plasticizers are EO / PO (for example oxyalkylene) plasticizer and preferably EO / PO comb polymer, a clay activity modifying agent is a polar organic, which can be absorbed by the inorganic cation, an organic cation, clay molecule, a clay dispersant (polyphosphates, etc.) or may comprise a mixture thereof. In the clay activity modifying agent comprising a cation or polar organic molecule, the reagent is preferably added to the clay prior to introducing water to the clay. Organic cations, such as reagent (having a strong affinity for the cation exchange of the clay) clay dispersants and quaternary amines can be added before or during or after introducing the water to the clay.