See this http://books.google.co.uk/books?id=AcWJDJM6iwUC&pg;=RA1-PA215&lpg;=RA1-PA215&dq;=plaster+of+paris+cohesion&source;=bl&ots;=URN1hAt_AR&sig;=EyYvxJz_NexTfssdzF89rqq7TmI&hl;=en&ei;=9dZcSvGkGJu6jAfO_7TZDQ&sa;=X&oi;=book_result&ct;=result&resnum;=7 (or http://books.google.co.uk/books?id=AcWJDJM6iwUC&dq;=plaster+of+paris+cohesion&source;=gbs_navlinks_s page 215) -  

 Its possible that a new article or subsection is needed "frictional cohesion in enginering/construction/building"