纳米材料对道路水泥混凝土性能的影响

以SiO2和TiO2两种纳米材料为研究对象,通过设计纳米材料种类和掺合量对混凝土进行相关试验,研究纳米材料对混凝土的力学性能,混凝土抗冻性、抗渗透性和碳化等耐久性能的影响规律.试验结果表明：纳米SiO2和TiO2均可以显著提高混凝土性能,纳米TiO2提高效果最佳.单纯提高纳米材料的掺合量不能提高水泥混凝土强度与耐久性能,纳米混凝土的抗压、抗折强度和抗碳化性能均随着掺合比例的增加呈现先提升后下降的趋势,且纳米SiO2和TiO2的最佳添加量为混凝土胶凝材料的2％和1％,在此条件下混凝土强度最高,碳化深度最小.两种纳米材料掺合1％左右时混凝土的磨损质量最小,耐久性指数最大,渗透性最低.

Influence of Nano Materials on Properties of Cement Concrete Roads

Through adding different amount of SiO2 and TiO2 nano-particles,the mechanical properties,frost resistance,permeability and durability of carbonation of the nanomaterials concrete were investigated.The test results show that the nano-SiO2 and TiO2 particles can significantly improve the performance of the concrete,and TiO2 nanoparticles has better improvement.The compressive,flexural strength and anti-carbonation properties are increased initially and the decreased with increasing blending ratio of the particles.The optimal addition of the nano-SiO2 and TiO2 particles is 2％ and 1％ of the concrete cementitious material,and the highest concrete strength and minimum carbonation depth can be obtained.When blending the two nanomaterials,the concrete wear is the lowest for 1％ particle addition with maximum durability index and minimum permeability.