In this study, the efficiency of surface treatment in the calcium sulfoaluminate (CSA) cement-based materials were explored. Several frequently used surface treatment agents (sodium silicate (NS), and magnesium fluorosilicate (MFS), tetraethyl orthosilicate (TEOS), poly-methyltriethoxysilane (PMTS)) were applied on hardened CSA mortar and concrete. The penetration depth of these agents and their influence on the properties of water sorptivity, carbonation resistivity, mechanical property, and pore structure was investigated. Results showed that the penetration depth of NS and MFS was around 60-85 μm, and that PMTS, MFS, TEOS, and NS could reduce the water sorptivity by 94.0%, 17.0%, 11.0% and 7.8%, respectively. PMTS and TEOS could reduce the carbonation rate by 38.7% and 14.3%, respectively, but NS and MFS could not reduce it. In addition, PMTS can reduce the pores less than 50 nm (S pores) significantly, whereas has little influence on pores between 50 nm and 1 μm (M pores). NS, MFS and TEOS would reduce M pores, but increase S pores. By the combination of permeability and pore structure test, it was found that volume of S pores was positively correlated to the carbonation rate and the volume of M pores was positively correlated to the water sorptivity. Furthermore, it was found that surface treatment had little influence on the compressive strength, but it could increase flexural strength slightly. This work evidenced the effectiveness of surface treatment on CSA cement-based materials and highlighted the critical role of fine pores (less than 50 nm) in their transport properties.

在这项研究中，探索了在硫铝酸钙（CSA）水泥基材料中进行表面处理的效率。将几种常用的表面处理剂（硅酸钠（NS）和氟硅酸镁（MFS），原硅酸四乙酯（TEOS），聚甲基三乙氧基硅烷（PMTS））涂在硬化的CSA砂浆和混凝土上。研究了这些试剂的渗透深度及其对吸水率，抗碳化性，机械性能和孔结构的影响。结果表明，NS和MFS的渗透深度为60-85μm左右，而PMTS，MFS，TEOS和NS可以分别降低94.0％，17.0％，11.0％和7.8％的吸水率。PMTS和TEOS可使碳酸化率分别降低38.7％和14.3％，但NS和MFS不能降低碳酸化率。此外，PMTS可以显着减少小于50 nm的孔（S个孔），而对50 nm和1μm之间的孔（M个孔）影响很小。NS，MFS和TEOS会减少M个毛孔，但会增加S个毛孔。通过渗透率和孔隙结构试验的组合，发现S孔的体积与碳酸化率呈正相关，M孔的体积与吸水率呈正相关。此外，发现表面处理对抗压强度影响很小，但是可以稍微提高抗弯强度。这项工作证明了在CSA水泥基材料上进行表面处理的有效性，并强调了细孔（小于50 nm）在其传输性能中的关键作用。而对50 nm至1μm（M个孔）之间的孔影响很小。NS，MFS和TEOS会减少M个毛孔，但会增加S个毛孔。通过渗透率和孔隙结构试验的组合，发现S孔的体积与碳酸化率呈正相关，M孔的体积与吸水率呈正相关。此外，发现表面处理对抗压强度影响很小，但是可以稍微提高抗弯强度。这项工作证明了在CSA水泥基材料上进行表面处理的有效性，并强调了细孔（小于50 nm）在其传输性能中的关键作用。而对50 nm至1μm（M个孔）之间的孔影响很小。NS，MFS和TEOS会减少M个毛孔，但会增加S个毛孔。通过渗透率和孔隙结构试验的组合，发现S孔的体积与碳酸化率呈正相关，M孔的体积与吸水率呈正相关。此外，发现表面处理对抗压强度影响很小，但是可以稍微提高抗弯强度。这项工作证明了在CSA水泥基材料上进行表面处理的有效性，并强调了细孔（小于50 nm）在其传输性能中的关键作用。结果发现，S孔的体积与碳酸化率呈正相关，M孔的体积与吸水率呈正相关。此外，发现表面处理对抗压强度影响很小，但是可以稍微提高抗弯强度。这项工作证明了在CSA水泥基材料上进行表面处理的有效性，并强调了细孔（小于50 nm）在其传输性能中的关键作用。结果发现，S孔的体积与碳酸化率呈正相关，M孔的体积与吸水率呈正相关。此外，发现表面处理对抗压强度影响很小，但是可以稍微提高抗弯强度。这项工作证明了在CSA水泥基材料上进行表面处理的有效性，并强调了细孔（小于50 nm）在其传输性能中的关键作用。