フライアッシューセッコウー石灰を原料とする蒸気養生多孔質材料の製造と強度に関する基礎的研究

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Raw mixtures have been prepared from raw materials of fly ash, slaked lime and type III-gypsum dehydrated at 200℃. The fly ash and the gypsum were supplied from a steam power station. Fine particles under 30 μm of the fly ash were collected by a cyclone. The bulk density of the fly ash is 0.97g/cm^3. The content of gypsum was varied from 10 to 50 wt% as CaSO_4・2H_2O with the variation of gypsum/lime molar ratio from 0.1 to 1.0. Slip cast technique into 2X2X8 cm moulds was performed using slurry of W/S 0.60. Hardened green bodies demoulded after 10-20 min were precured at room temperature for 30 min measured from the flooding point of time. Then the steam curing was carried out at 80℃ and 90% R.H. for 23.5 h. Test pieces thus obtained were subjected to three-point flexural and compressive resistance tests. Flexural strength, 1-3 MPa and compressive strength, 2-9 MPa were reached. Increasing content of the fly ash makes the strength weak. High strength is obtained in compositional range of 20-60 wt% of fly ash. The bulk density of the products is 0.97-1.17 g/cm^3. Although the porous. materials have water absorption property, they show the water resistance and machinable properties. Therefore, the present steam-cured porous hardened bodies of low density will be suitable for the sound and heat insulating materials. Besides those of high strength may be applicable to the constructive materials as well.
社団法人日本セラミックス協会の論文
1989-04-01

フライアッシューセッコウー石灰を原料とする蒸気養生多孔質材料の製造と強度に関する基礎的研究

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