Chelator has the effect of improving the mineralization curing degree of cement-based materials. However, the moisture content in the pores of concrete will affect the permeability and dissolution of CO as well as the complexation and migration of Ca by chelator, thus influencing the performance of CO-cured concrete containing chelator. To obtain optimal moisture content for CO-cured cement mortar mixed with chelator (CMC), the effects of the residual water cement ratio (RW) on the properties, microstructure, and carbon sequestration of CO-cured CMC was investigated in this paper. The findings showed that the reduction of RW was beneficial for improving the mechanical properties and impermeability of mineralization curing CMC, but excessive reduction of RW weakened the action effect of chelator on accelerating the development of compressive strength. The optimal RW for mineralization curing ordinary cement mortar was 0.15 to achieve the fastest development of its mechanical properties, while the optimal RW for CMC was 0.2. It was also found that chelator was beneficial for shortening the curing period of CO-cured mortar by more than half. Chelator significantly improved the aperture structure of CO-cured mortar with a RW of 0.2 and promoted the transformation of larger to smaller pores through increasing the porosity of pore size between 0.01 and 0.02 μm by 7.1% and decreasing the portion of pores above 1 μm in the mortar by 24.2% after mineralization curing for 48 h. The reduction of RW was conducive to the permeation and diffusion of CO, significantly enhancing the capacity of carbon sequestration of CMC. The RW was decreased from 0.5 to 0.2, and the carbon sequestration rate of CMC was increased by 551.6% after 48 h of mineralization curing. Meanwhile, compared to CO-cured ordinary cement mortar, the carbon sequestration rate of CMC could be increased by 9.7% and 12.1% after 4 h and 48 h of curing, respectively.

中文翻译：

---

含水量对掺螯合剂CO2养护水泥砂浆性能、微观结构及固碳性能的影响

螯合剂具有提高水泥基材料矿化固化程度的作用。然而混凝土孔隙中的含水量会影响CO的渗透和溶解以及螯合剂对Ca的络合和迁移，从而影响含螯合剂CO养护混凝土的性能。为了获得掺有螯合剂（CMC）的CO固化水泥砂浆的最佳含水率，本文研究了残余水灰比（RW）对CO固化CMC的性能、微观结构和碳吸收的影响。结果表明，RW的减少有利于提高矿化固化CMC的力学性能和抗渗性能，但RW的过度减少削弱了螯合剂加速抗压强度发展的作用效果。矿化养护普通水泥砂浆的最佳RW为0.15，使其力学性能发展最快，而CMC的最佳RW为0.2。研究还发现，螯合剂有利于将共养护砂浆的养护周期缩短一半以上。螯合剂显着改善了CO固化砂浆的孔隙结构，RW为0.2，通过使0.01~0.02μm孔径的孔隙率增加7.1%，减少1μm以上孔隙的比例，促进大孔隙向小孔隙转变。矿化养护48 h后砂浆减少24.2%。 RW的减少有利于CO的渗透和扩散，显着增强CMC的固碳能力。矿化固化48 h后，RW由0.5降低至0.2，CMC固碳率提高551.6%。同时，与CO养护的普通水泥砂浆相比，养护4 h和48 h后，CMC的固碳率可分别提高9.7%和12.1%。