处于除冰盐环境和海洋大气环境中的混凝土结构将受到碳化和氯离子侵蚀的共同作用。通过盐溶液浸泡与碳化交替方式,研究了碳化作用对混凝土中氯离子扩散的影响。结果表明：碳化作用加快了混凝土中氯离子扩散速度,提高了混凝土中的氯离子含量,相对于混凝土碳化对结合氯离子的释放作用,碳化导致的混凝土微观结构重分布对氯离子扩散的加速作用占主导地位。分析了碳化混凝土中的碳化钙分布和碳化深度,结果表明,用化学试剂法测试混凝土碳化深度时,碳化与未碳化交界处位于混凝土部分碳化区,交界处碳酸钙含量变化范围为5.4%～10.8%。

The concrete structures in deicing salt environment and marine atmospheric environment will suffer the dual effect of car-bonation and chloride corrosion. The influence of carbonation on chloride diffusion in concrete was investigated by alternation of immersion and carbonation. The results show that carbonation increases the speed of chloride diffusion and the content of chloride in concrete. The microstructure redistribution of concrete caused by carbonation dominates the acceleration of chloride diffusion com-pared with the release of binding chloride because of carbonation. The distribution of calcium carbonate and carbonation depth in concrete after carbonation was also analyzed. The results show that the boundary between carbonated zone and uncarbonated zone is in the half-carbonated zone of concrete, where the content of calcium carbonate ranges from 5.4% to 10.8%when the carbonation depth is tested by the law of chemical reagents.

通过对碳化深度进行测定，针对浆体膨胀材料充填体的碳化规律及机理展开研究，采用SEM和XRD分析对充填体结构进行微观测试，探究了关于浆体膨胀材料充填体碳化的相关机理与规律，研究结果表明：浆体膨胀材料充填体的碳化规律与混凝土有很大区别，自由水对碳化反而起阻止作用，揭示出充填体先失水后碳化，结晶水碳化的反应机理，也总结出了分步碳化，酸碱度中性化且碳化后充填体强度残留的碳化规律。

Based on the carbonization depth determination, researches on carbonation regularity and mechanism of expansion material iflling body, using SEM and XRD analysis to microscopic test on the structure of iflling body, to explore the related carbonization mechanism and rules of expansion slurry filling materials, the results of the study show that:the expansion of concrete carbonation regularity and paste iflling materials body has the very big difference, the free water impedes the carbonation, revealed the mechanism that the iflling body ifrstly lost water and then carbonized, and the mechanism of carbonation reaction of crystal water, also summarized the step carbonization, carbonation pH neutral strength of iflling body and carbonized residue.

通过对承载喷射混凝土进行快速碳化试验，分析了施工方式、钢纤维、应力水平对混凝土碳化深度的影响规律，同时对其碳化后的力学性能进行了探讨。试验结果表明，承载喷射混凝土的碳化深度与碳化时间的平方根成正比；其抗碳化能力优于同条件下的浇筑混凝土，但是劣于喷射钢纤维混凝土；弯拉应力水平越高，混凝土碳化深度也越大；建立了应力加速因子与应力水平的关系。碳化使喷射混凝土的抗折强度降低，但掺入钢纤维后，其抗折强度相对有所改善。

After accelerated carbonation experiment of shotcrete under bending loads,the influence of construction mode,steel fiber content as well as stress level on carbonation depth was analyzed ,and the mechanical properties of carbonized shotcrete was discussed.The test results show that the carbonation depth of shotcrete under bending loads is proportional to the square root of carbonation time ,and the car bonation resistance of sprayed concrete is better than ordinary concrete under the same conditions ,but inferior to steel fiber rein-forced shotcrete.The higher flexural tensile stress level is,the higher the depth of carbonation can be observed.The relationship between stress acceleration factor and the stress level is established.Carbonation can reduce the bending strength of shotcrete ,however,with the in-corporation of steel fibers,the flexural strength can be improved.

通过研究不同配合比混凝土的碳化深度以及气体渗透系数，发现粉煤灰可以减小碳化，并且碳化后混凝土的气体渗透性也会提高。同时分析了高性能混凝土气体渗透性与碳化性能之间的关系。结果表明混凝土的气体渗透性对碳化深度的控制程度是受粉煤灰掺量的影响，且粉煤灰掺量越高，气体渗透性对碳化的贡献作用越小。

Carbonation depth and air permeability coefficient of concrete samples with different mix proportion were investigated. Results shows that addition of fly ash can decrease carbonation depth.Furthermore,air permeability increased after carbonation.Relation-ship between air permeability and carbonation was also studied.It was found that effect of air permeability on carbonation was impacted by the content of fly ash,and the contribution of air permeability to carbonation decreased with the increase of fly ash.

为研究玻化微珠保温混凝土的碳化性能,进行了不同碳化龄期的室内快速碳化试验。在保温混凝土优化配合比的基础上选定三种不同的水灰比设计试验,测定不同龄期的碳化深度和立方体抗压强度,并选定同等条件下的普通混凝土进行了对比。试验结果表明,保温混凝土的抗碳化性能较好,运用回归分析法建立了保温混凝土的碳化深度预测模型,确定了抗压强度与碳化龄期之间的定量关系表达式。

In order to study the carbonation resistance of glazed hollow beads thermal insulation concrete, accelerated carbonation experiment under different carbonization time has been conducted. The tests have been designed choosing three different water cement ratios on the basis of the optimum mixture ratio. The carbonation depth and cube compressive strength under different carbonization time have been determined, and then compared with ordinary concrete. Test results show that the insulation concrete has a good carbonation resistance. The carbonation depth prediction model has been es-tablished using the regression analysis method. And the quantitative relational expression between concrete strength and carbonation time has been determined.