因为保护层过大，钢筋网起不到抗裂作用，保护层过小，容易引起桥面铺装裂缝。
Because the protective layer is too large, the steel mesh can not play the role of anti crack, the protective layer is too small, easy to cause the cracks in the bridge deck pavement.
研究结果表明：减缩剂能够改善高性能混凝土的工作性、对混凝土的力学性能无负作用、能够有效的提高混凝土的抗裂性能。
The results is to approve that SRA can improve the workability of HPC, and promote effectively anti-cracking performance, without coming negative effect into mechanics property.
根据试验结果，本文提出了抗裂度、极限扭矩以及在使用荷载作用下最大允许扭矩的计算公式。
Based on the test results the paper presents formulas for determining cracking torque, ultimate torque and the maximum admissible torque under service loads.
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