水泥板块8月21日涨0.27%，三和管桩领涨，主力资金净流出4.75亿元

Group 1 - The cement sector experienced a slight increase of 0.27% on August 21, with Sanhe Pile leading the gains [1] - The Shanghai Composite Index closed at 3771.1, up 0.13%, while the Shenzhen Component Index closed at 11919.76, down 0.06% [1] - Key stocks in the cement sector showed varied performance, with Sanhe Pile closing at 9.34, up 3.32%, and Fujian Cement at 5.60, up 1.27% [1] Group 2 - The cement sector saw a net outflow of 475 million yuan from major funds, while retail investors contributed a net inflow of 279 million yuan [2] - Among individual stocks, Tianshan Shares had a major net inflow of 53.43 million yuan, despite a significant outflow from retail investors [3] - The overall trading volume for the cement sector was substantial, with Tianshan Shares recording a trading volume of 816,700 shares [1][2]