Posted: November 21, 2019 at 9:40 pm TWG Source Sand Castle Holds Up A Car! – Mechanically Stabilized Earth Dirt is probably the cheapest and simplest construction material out there, but it’s not very strong compared to other choices. Luckily geotechnical engineer… Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.