Scholarlink

<p>Aiming at the problems of short setting time and poor fluidity of PC clinker-CSA-C$ ternary system cement, this study explored the regulation and action mechanism of sodium gluconate (SG) and chitosan (CS) on its working performance. Through macroscopic tests of setting time, fluidity and compressive strength, it is found that composite retarder can significantly prolong the setting time of PC clinker-CSA-C$ ternary system cement, increase the fluidity of slurry, improve the early strength and stabilize the later strength development. Through scanning electron microscope (SEM), thermogravimetric analysis (TG), X-ray diffraction (XRD), hydration heat (TAM) and Zeta potential, it is found that when sodium gluconate is compounded with chitosan, it can form synergy through the dual mechanism of “charge repulsion&#xa0;+&#xa0;steric hindrance”. When the ratio of 0.2% SG to 0.15% CS is used, the initial setting time and final setting time of cement paste are extended to 79–99&#xa0;min; respectively. The initial fluidity of cement paste reaches 133.4&#xa0;mm, and after 30&#xa0;min, the fluidity only loses 18.4%. Compared with the control group, the 1-day compressive strength is reduced by about 4.4&#xa0;MPa, and the 28-day compressive strength is the same as that of the control group. The research results of the composite retarder provide theoretical basis and technical support for the optimization of the working performance of PC clinker-CSA-C$ ternary system cement.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the working properties and mechanism of PC clinker-CSA-C$ ternary system cement regulated by chitosan-sodium gluconate

  • 期刊论文

  • 发表日期：

    2026年6月1日

查看全文
  • Min Li,
  • Jiahui Zhou,
  • Xuna Wang

摘要

Aiming at the problems of short setting time and poor fluidity of PC clinker-CSA-C$ ternary system cement, this study explored the regulation and action mechanism of sodium gluconate (SG) and chitosan (CS) on its working performance. Through macroscopic tests of setting time, fluidity and compressive strength, it is found that composite retarder can significantly prolong the setting time of PC clinker-CSA-C$ ternary system cement, increase the fluidity of slurry, improve the early strength and stabilize the later strength development. Through scanning electron microscope (SEM), thermogravimetric analysis (TG), X-ray diffraction (XRD), hydration heat (TAM) and Zeta potential, it is found that when sodium gluconate is compounded with chitosan, it can form synergy through the dual mechanism of “charge repulsion + steric hindrance”. When the ratio of 0.2% SG to 0.15% CS is used, the initial setting time and final setting time of cement paste are extended to 79–99 min; respectively. The initial fluidity of cement paste reaches 133.4 mm, and after 30 min, the fluidity only loses 18.4%. Compared with the control group, the 1-day compressive strength is reduced by about 4.4 MPa, and the 28-day compressive strength is the same as that of the control group. The research results of the composite retarder provide theoretical basis and technical support for the optimization of the working performance of PC clinker-CSA-C$ ternary system cement.