| 摘要 |
This mortar is made up of clay, cement, mixing water and an additional agent. The weight proportion of clay is at least equal to that of cement. The additional agent is chosen from urea-formaldehyde and melamine-formaldehyde resins and their derivatives. The weight percentage of the said agent, calculated as the weight of solids contents of this agent relative to the weight of solids contents of the clay-cement mixture, is between 1 and 20 %. Such a mortar can be employed for the manufacture of coherent products which have favourable mechanical characteristics, with absence of fissures. |
