海盐阳离子对硫铝酸盐水泥性能的影响研究

Research on Influence of Sea Salt Cation on Properties of Sulfoaluminate Cement

本试验探究海水中常见阳离子对硫铝酸盐水泥(SAC)性能的影响规律,旨在为海工混凝土的研究及实际工程应用提供参考.根据海水中阳离子浓度配制1倍、1.5倍、2倍和2.5倍对应浓度的乙酸盐溶液作为拌和水,研究海盐阳离子种类及浓度对硫铝酸盐水泥砂浆的工作性能、物理性质、力学性能以及净浆凝结时间的影响,并通过微观试验分析水泥水化产物和微观结构.结果表明,钠离子和钙离子掺入缩短SAC凝结时间,钾离子对其凝结时间影响不大,镁离子显著延长SAC凝结时间,流动度变差.阳离子掺入降低水泥净浆孔隙率和吸水率,较高浓度倍数阳离子掺入不利于水泥砂浆的抗折强度,但有利于其抗压强度.

The present experiment aimed to investigate the impact of common cations found in seawater on the properties of sulfoaluminate cement(SAC),with the objective of providing valuable insights for both research and practical applications in Marine concrete engineering.Acetate solutions were prepared with concentrations equivalent to 1x,1.5x,2x,and 2.5x the cation concentration in seawater,serving as mixing water for the investigation.This study focuses on examining the influence of sea salt cations on sulfoaluminate cement mortars,considering their impact on workability,physical properties,mechanical properties,and setting time.The goal is to comprehensively understand how the type and concentration of sea salt cations affect various aspects of SAC mortar performance.Additionally,microscopic tests were conducted to analyze the hydration products of cement and its microstructure.The results indicated that the inclusion of sodium and calcium ions reduced the setting time of SAC,while potassium ions had little effect on the setting time.Magnesium ions significantly extended the setting time and worsened flowability.The incorporation of cations reduced the porosity and water absorption rate of the cement paste.The addition of cations at higher concentration multipliers adversely affected the flexural strength of the cement mortar but was beneficial for its compressive strength.