| 摘要 |
Mfr. of light wt. structure elements from masses which can be hardened hydrothermally. The process comprises the prodn. of a matrix which can be subjected to plastic forming, from 1. a fine-grained silicate material such as quartz sand or powdered glass; binders which can be hardened hydrothermally; 3. lightweight aggregate; 4. water; and 5. possibly hydraulic binders. The matrix is pressed to shape, followed by hardening of the shaped body by treatment with steam under pressure. The body is acted upon by compressed air before the steam treatment stage. Pref. the compressed air treatment is carried out for 5-60 second, using compressed air at a pressure of 0.5 to 5.0 bar. Steam treatment follows directly after compressed air treatment, without the compressed air pressure being turned off. The compressed air treatment acts to carry the existing moisture content into the matrix and to the aggregate grains. The air-steam mixt. used is drier than steam alone and shows less tendency to condense. This stabilises the shaped body. Moreover, hardening of the binder takes place before the water boils off. The process only represents a small modification to conventional processes, with a minimal effect on operating costs. USE/ADVANTAGE - For the mfr. of lightweight structural elements such as door arches, wall slabs or other finished parts from materials which can be hardened hydrothermally. No alternations in shape occur before or during the treatment with steam, and parts of high strength of with good thermal insulating properties can be mfd.
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