Through systemic anti-freeze tests on Raymond cylinder piles and PHC piles from several precasting plants, it is
found that the frost resistance of both type of piles is excellent. On condition that the raw materials and production technology
are well controlled，the anti-freeze level of a Raymond cylinder pile can reach F350, even above F1000，and the joints of a
Raymond cylinder pile won忆t be the weak link after freeze-thaw cycles. The anti-freeze level of PHC pile can also reach F350
and even above F1000 when they are fabricated through “autoclave curing method” and “non-autoclave curing method”.
The research shows that the steam curing may bring adverse effect on the frost resistance of pile concrete，but it can be im proved through strict control of production technology, adding mineral admixtures and optimization of concrete proportion.