striking of vertical formwork
striking of vertical formwork
(OP)
Hi, looking into striking times of vertical formwork normally in water retaining applications. We typically use ggbs replacement mix. Apart from strength considerations what is minimum striking time used by others here? the ggbs will slow the strength gain and prolong the heat gain (although lower temps than non replacement mix). we have various 'guidance' here in UK and have advised site on times.





RE: striking of vertical formwork
A prior search of ACI documents provided a minimum strength of 1000 psi for stripping/striking of vertical formed surfaces for architectural finishes.
In a recent support structure for a government project, we did not strip until 1500 psi was attained and had little if any damage due to form removal.
The added cost of using a perrformance based spec is additional cylinders and additional testing, but the ability to actually know when things should be done is certainly worth it in our eyes.
Hope this helps,
Daniel Toon
RE: striking of vertical formwork