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纤维增强水泥基复合材料的增强理论较为复杂，传统的复合理论及纤维间距理论都不能圆满地解释其增强作用。为了抛开短纤维因不连续性和随机分布带来的复杂问题，作者结合顺向连续纤维水泥基复合材料介绍利用断裂力学推导出的新理论──兼有阻裂作用的复合理论。该理论不仅可以预测复合材料的强度，还能推出应力－应变曲线中的非线性增长段。
The reinforcement theory of fiber-reinforced cementitious composites is rather complex. The traditional theory of compounding and the theory of fiber spacing cannot fully explain its reinforcing effect. In order to abandon the complex problems brought about by the discontinuity and random distribution of short fibers, the authors introduced a new theory derived from fracture mechanics in combination with forward continuous fiber cement-matrix composites – a composite theory that combines both crack resistance and crack resistance. This theory not only predicts the strength of composites but also introduces non-linear growth in the stress-strain curve.