Patent ID: 6068696
Filing Date: 2000-05-30
Classification: C04B

Abstract:
A mortar cement composition comprisinga) ground portland cement clinker,b) ground limestone and/or lime,c) sand,d) a sufficient amount of water to render the composition flowable, ande) at least one water-soluble polymer present in the amount having a lower limit of about 0.001 wt % and an upper limit of about 0.04 wt % based on total dry weight of the ingredients, said water-soluble polymer being selected from group consisting of hydroxypropylcellulose (HPC), hydroxyethylcellulose (HEC), methylcellulose (MC), hydroxypropylmethylcellulose (HPMC), methylhydroxyethylcellulose (MHEC), hydrophobically modified hydroxyethylcellulose (HMHEC), and mixtures thereof and having a molecular weight lower limit of about 50,000with the proviso that the extent of adsorption of the polymer onto the portland cement is less than 50%, andwherein the mortar cement has 8-16% air content and greater than 70 psi flexural bond strength according to ASTM C-1329-96.