碱激发胶凝材料研究进展
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摘要
介绍了碱激发胶凝材料的制备技术和碱激发反应机理,总结了碱激发胶凝材料的工作性能、力学性能、耐久和耐高温特性。分析表明:激发剂的掺量和水玻璃模数是影响碱激发胶凝材料凝结时间和流动度的关键参数,凝结时间介于13～183 min之间,终凝时间介于15～215 min之间,流动度介于133～230 mm之间,可通过改变激发剂的掺量和水玻璃模数使凝结时间和流动性满足不同要求;碱激发胶凝材料具有早强、高强的特点,28 d抗压强度可达到60 MPa以上,3 d抗压强度可达到稳定强度的70%以上;碱激发胶凝材料高温下性能较稳定,在600～800℃的高温下抗压强度可达到常温状态下的60%以上;碱激发胶凝材料具有优异的抗冻融性能,其抗冻等级可达到F300以上;碱激发胶凝材料中由于没有极易遭受侵蚀的水化产物存在,故抗酸腐蚀能力强;碱激发胶凝材料由于孔结构致密,具有良好的抗渗性能。并针对碱激发胶凝材料优选配比和应用所需要解决的收缩、泛霜等问题,对未来研究的方向进行了展望。
This paper introduces the preparation technology and reaction mechanism of alkali-activated cementitious materials and then summarizes workability, mechanical properties, durability and high-temperature resistance of alkali-activated cementitious materials. It is found that the content of alkali activator and the modulus of sodium silicate are the key parameters affecting the setting time and fluidity of alkali-activated cementitious materials, of which the initial setting time is 13-183 min, the final setting time is 15-215 min and the fluidity is 133-230 mm. Different requirements of setting time and fluidity can be met by changing the content of alkali activator and modulus of sodium silicate. Alkali-activated cementitious materials have the performance of high strength and early strength, whose compressive strength can reach above 60 MPa at the age of 28 days, and the compressive strength at the age of 3 days can be up to more than 70% of the strength at the steady state. Alkali-activated cementitious materials can withstand at least 600-800 ℃, at which the compressive strength can remain above 60% of the strength at the normal temperature. Alkali-activated cementitious materials have excellent freeze-thaw resistance with frost-resisting grade of F300 at the lowest. Alkali-activated cementitious materials can resistant the acid corrosion due to the absence of products that are vulnerable to be corroded. Alkali-activated cementitious materials have excellent impermeability because of their dense structure of pores. Finally, aiming at the problems to be solved for the optimization and application of alkali-activated cementitious materials, such as the shrink and frost, this paper discusses the research trend of alkali-activated cementitious materials.
This paper introduces the preparation technology and reaction mechanism of alkali-activated cementitious materials and then summarizes workability, mechanical properties, durability and high-temperature resistance of alkali-activated cementitious materials. It is found that the content of alkali activator and the modulus of sodium silicate are the key parameters affecting the setting time and fluidity of alkali-activated cementitious materials, of which the initial setting time is 13-183 min, the final setting time is 15-215 min and the fluidity is 133-230 mm. Different requirements of setting time and fluidity can be met by changing the content of alkali activator and modulus of sodium silicate. Alkali-activated cementitious materials have the performance of high strength and early strength, whose compressive strength can reach above 60 MPa at the age of 28 days, and the compressive strength at the age of 3 days can be up to more than 70% of the strength at the steady state. Alkali-activated cementitious materials can withstand at least 600-800 ℃, at which the compressive strength can remain above 60% of the strength at the normal temperature. Alkali-activated cementitious materials have excellent freeze-thaw resistance with frost-resisting grade of F300 at the lowest. Alkali-activated cementitious materials can resistant the acid corrosion due to the absence of products that are vulnerable to be corroded. Alkali-activated cementitious materials have excellent impermeability because of their dense structure of pores. Finally, aiming at the problems to be solved for the optimization and application of alkali-activated cementitious materials, such as the shrink and frost, this paper discusses the research trend of alkali-activated cementitious materials.
引文
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