Method for low-to-mid-range water reduction of cementitious compositions

(22) 29.01.2018

(43) 01.08.2019

(57) Methods for plasticizing cementitious mixtures having relatively high water/cement ratio (at least 0.40 or higher) are surprisingly improved in terms of dosage efficiency, compared to conventional "superplasticizer" polycarboxylate polymers, when the polycarboxylate polymer is formed from particularly small-sized, specifically selected monomer constituents: (A) polyoxyalkylene monomer represented by the structural formula (R¹)(R³)C=C(R²)((CH₂)_m(CO)_nO(CH₂)_o(AO)_pR⁴) wherein (AO)_p, represents linear ethylene oxide groups and p is 5-23 and more preferably 5-15; (B) unsaturated carboxylic acid represented by (R⁵)(R⁷)C=C (R⁶)(C(O)OM) wherein M represents an alkali metal, the ratio of component A to component B being 20:80 to 50:50; and, optionally, (C) a hydrophilic monomer represented by (R⁸)(R⁹)C=C(R¹⁰)(CX) wherein R⁸, R⁹, and R¹⁰ each represent hydrogen or methyl group, and X represents C(O)NH₂, C(O)NHR¹¹, C(O)NR¹²R¹³, SO₃H, C₆H₄SO₃H, or C(O)NHC(CH₃)₂CH₂SO₃H, or mixture thereof, wherein R¹¹, R¹², and R¹³ each represent a C₁ to C₅ alkyl group.

(71) Lawrence L Kuo, Acton, MA (US); Izabela Goc-Maciejewska, Skorzewo (PL); Natalia Jaskula, Kolo (PL)