公开(公告)号：US3801343A

公开(公告)日：1974-04-02

申请号：US3801343D

申请日：1972-02-25

Applicant: STAMICARBON

Inventor： LEMMENS J

IPC: C04B14/12 ,  C04B20/06 ,  C08H17/02

CPC classification number: C04B20/068 ,  C04B14/12 ,  C04B14/10

Abstract: The invention relates to a process of preparing a lightweight granular aggregate for use in concrete objects and structures, by an intimately mixing a clayey material with materials that help to reduce the weight, granulating this mixture and then heating the granules at least to the temperature at which their mass expands. Use is made of a combination of two known auxiliary materials, the first being a porous inorganic material with open pores, added in an amount of 10-20 percent by volume with respect to the clayey material, and substantially having a grain size below 2 mm., and the second consisting of one or more substances that, upon heating, yield gaseous components at a temperature over 800* C. Use is made of a porous inorganic material having a softening temperature equal to or lower than that of the clayed material.