|stabilized blocks after 6 inches of rain|
|unstabilized blocks after 6 inches of rain|
Only 48 hours after pressing, we had 5 days of steady rain and then freezing for two nights. In the picture of un-stabilized blocks on the conveyor, you can see how much erosion (called spalling) occurred in the week of rain. They are misshapen, although perhaps not as badly as you might think for being virtually underwater for a week. One point: don’t use these in any house you intend to sleep in. The first picture shows a pile of stabilized block under the same conditions. They are still clean with very little spalling and very, very hard—maybe harder for the drenching! Stabilizing blocks with Portland made all the difference. Later, I will present what appear to be even more advantages to 10% stabilization. Stay tuned for those statistics and test results for the stabilized block.