一、前言混凝土抗压强度的均方差σ或变差系数C_v是随抗压强度而变,还是保持为常数?这在国内外一直是个争论的问题。1980年《水利水电技术》和《水力发电》曾先后发表过论及这方面的文章纠。这两篇文章均引用相同的误差传递理论,但却得出完全相反的结 I. INTRODUCTION The mean square deviation σ or variation coefficient C_v of concrete compressive strength varies with compressive strength or remains constant. This has always been a controversial issue at home and abroad. In 1980 “water conservancy and hydropower technology” and “hydropower” has published articles on this issue has been corrected. Both of these articles cite the same error transfer theory, but arrive at exactly the opposite conclusion