Study on Development of Concrete Composite Pipe with High Strength and Resistance to Acid Attack

1.在钢筋混凝土管道中采用膨胀混凝土，以产生化学预应力，提高管道抗裂强度。首先阐述了膨胀混凝土的物理力学性能。其次，制作了由普通混凝土和膨胀混凝土组成的钢管，分析了化学预应力的分布情况。再次，通过荷载试验验证了膨胀混凝土对混凝土抗裂强度的影响.预应力钢丝缠绕在钢筋混凝土管上，张拉锚固，以产生机械预应力。阐明了机械预应力与钢管抗裂强度的关系.对聚合物砂浆作为钢筋混凝土管道内衬材料进行了研究。阐述了聚合物砂浆与基层钢筋混凝土管的物理性能、耐酸腐蚀性能、粘结强度.设计、制造并试验了一种高强度耐酸性复合管。综合考虑组成材料的物理力学性能和成本，对复合管进行了优化设计。

1. Expansive concrete was used for reinforced concrete pipe in order to induce chemical prestress and increase cracking strength. Firstly physical and mechanical properties of expansive concrete was clarified. Secondly a pipe composed of ordinary concrete and expansive concrete was made and distribution of chemical prestress were analyzed. Thirdly the effects of use of expansive concrete for cracking strength were confirmed by loading test.2. PC wire was wrapped round the reinforced concrete pipe and was tensioned and anchored in order to induce mechanical prestress. The relations between mechanical prestress and cracking strength of the pipes were clarified.3. Polymer mortars as lining material for reinforced concrete pipe were investigated. Physical properties, resistance to acid attack, bond strength of polymer mortar and base reinforced concrete pipe were clarified.4. A composite pipe with high strength and resistance to acid water was designed, made and tested. The optimum design on the composite pipe was performed by considering physical properties and mechanical characteristics of constituting materials and their costs.