This method uses saturate steam at pressure ranging from 125-150 psi and temperature of 178℃, this method usually requires additional equipment such as an autoclave(kiln), the strength of high pressure cured concrete masonry units at one day age are equivalent to the 28 days strengths of moist-cured blocks, this process produces dimensionally stable units that exhibit less volume change(up to 50% less). However, autoclave unit require a much higher.28 days curing to gain the full strength of masonry product is based on concrete which is slightly different when applying for the dry mix material for the block making. It is very commonly now cement is added with high quality Fly ash, and under the favorable condition like the temperature and humidity, the compressive strength of the block/paver with gain up to 80% in less than 7 days curing, by using the #425 type cement and design the mix proportional at least 20% higher than the required compressive strength, the block/paver will be qualified to be delivered to the clients.
Best Regards
Jonathan Yan (exported manager)
Mobile: (86)-18659803696
Tel: (86)-595-28085862
Fax: (86)-595-28085861
E-mail: Jonathan@unikmachinery.com