Patent ID: 7244840
Filing Date: 2007-07-17
Classification: C04B

Abstract:
1. A method for selecting a nonionic water-soluble cellulose ether suitable for use as an admixture for extrudable hydraulic compositions, comprising the steps of: adding 3 parts by weight of a nonionic water-soluble cellulose ether to a mixture of 90 parts by weight of cordierite, 10 parts by weight of ordinary Portland cement, and 33 parts by weight of water, immediately thereafter kneading the ingredients at 20° C. and 20 rpm, measuring a time taken until a maximum torque for kneading is reached, and judging the nonionic water-soluble cellulose ether to be suitable when the time taken until a maximum torque is reached is within 180 seconds from the addition.