Robust Air-Detraining for Cement Milling

Abstract

The present invention discloses compositions and methods wherein air entrained in cementitious materials at least one air-entraining cement additive is detrained using an ethoxylated, propoxylated fatty alcohol or alkylphenol having robustness for withstanding the harsh temperature and mechanical shearing effects of cement grinding mills. Exemplary air-entraining cement additives include a tertiary alkanolamine, a lignosulfonic acid or salt thereof, naphthalene sulfonate formaldehyde condensate, melamine sulfonate formaldehyde condensate, a glycol, a glycerin, or mixtures thereof.

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         12 . An additive composition for modifying a hydratable cementitious binder material, comprising:
 a homogenous aqueous liquid solution comprising   (a) at least one air-entraining cement additive in an amount of at least 5% to no more than 95% by weight of total solids within said solution, the at least one air-entraining cement additive comprising a tertiary alkanolamine, a lignosulfonic acid or salt thereof, naphthalene sulfonate formaldehyde condensate, melamine sulfonate formaldehyde condensate, a glycol, a glycerin, or mixtures thereof;   (b) an air-detraining ethoxylated, propoxylated fatty alcohol or alkylphenol represented by formula (I) or (II):
   CH 3 (CH 2 ) x CH 2 —O(CH 2 CH 2 O) n (CH 2 CH(CH 3 )O) m H   (I)
 
   R 1 —R 2 —O(CH 2 CH 2 O) n (CH 2 CH(CH 3 )O) m H   (II)
 
   
       wherein x represents an integer of=2-18; n and m each represent an integer of 3 to 15; R 1  represents an alkyl group having 4 to 12 carbons; and R 2  represents a benzene ring; the at least one tertiary alkanolamine and said ethoxylated, propoxylated fatty alcohol or alkylphenol (both hereinafter EPFA) being present by weight within the ratio (tertiary alkanolamine:EPFA) of 19:1 to 1:1 by dry solids weight; and
 (c) water in the amount of 10%-50% by total weight of the homogenous aqueous liquid solution. 
 
     
     
         13 . The additive composition of  claim 12  wherein the at least one at least one air-entraining cement additive is a tertiary alkanolamine selected from the group consisting of triethanolamine, triisopropanolamine, diethanol isopropanolamine, ethanol diisopropanolamine, tetra(hydroxyethyl) ethylene diamine, tetra(hydroxypropyl) ethylene diamine, methyl diethanolamine, or mixtures thereof. 
     
     
         14 . The additive composition of  claim 12  further comprising a cement additive selected from the group consisting of a non-tertiary alkanolamine, a chloride salt, a sugar or carbohydrate, a nitrite, a nitrate, a thiocyanate, a water reducer, or mixtures thereof. 
     
     
         15 . The additive composition of  claim 12  wherein the at least one air-entraining cement additive is triisopropanolamine. 
     
     
         16 . A cementitious composition comprising a hydratable cementitious binder material and the additive of  claim 12 . 
     
     
         17 . The cementitious composition of  claim 15  wherein the hydratable cementitious binder material contains Portland cement ground from clinker having at least 4% C 4 AF by weight of clinker and the at least one air-entraining cement additive is present in an amount of 0.0005% to 0.2% by weight of the hydratable cementitious binder material. 
     
     
         18 . The composition of  claim 17  wherein the hydratable cementitious binder material further comprises a filler or cement substitute in the amount of 5%-75% based on dry weight of the hydratable cement, the filler or cement substitute being selected from the group consisting of fly ash, granulated blast furnace slag, limestone, natural or artificial pozzolan, or mixtures thereof. 
     
     
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         20 . The composition of  claim 12  wherein R 1  represents a linear C 9 H 19  group.