| 摘要 |
In a cement-based extrusion molding composition, deterioration of productivity due to fluctuation of unburned carbon is prevented by ensuring excellent dispersibility of coal ash mainly composed of fly ash, the extrusion pressure in extrusion molding is reduced, and the strength of a molded product in the same curing condition as in single use of silica sand or silica stone powder is developed. The cement-based extrusion molding composition of the invention comprises: 100 parts by weight of a mixture comprising a hydraulic material, a silicious raw material including fly ash as an essential component and a fiber; 0.1 to 1.5 parts by weight of an extrusion aid; 15 to 45 parts by weight of water; 0.01 to 2.0 parts by weight of a nitrogenous polyoxyalkylene derivative represented by formula (1); and 0.01 to 2.0 parts by weight of a copolymer having a composition of 50 to 99 wt % of a constituting unit (a) represented by formula (2), 1 to 50 wt % of a constituting unit (b) represented by formula (3) and 0 to 30 wt % of a constituting unit (c) derived from another copolymerizable monomer.
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