缓凝剂对快硬修补砂浆性能的影响
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摘要
以白色双快硫铝酸盐水泥为胶凝材料制备早强快硬修补砂浆材料,研究了缓凝剂种类和掺量、减水剂掺量和和易性调节剂等对修补砂浆工作性能、力学性能、拉伸黏结强度和自由膨胀率的影响规律。结果表明:随着柠檬酸和硼砂掺量的增加,新拌砂浆扩展度呈单峰变化趋势,前者的掺加能有效控制新拌砂浆的可工作时间,而硼砂与该体系的胶凝材料适应性较差;随着柠檬酸掺量增加,硬化砂浆早期抗压和抗折强度均呈逐渐降低趋势;未掺加柠檬酸的硬化砂浆7 d拉伸黏接强度为1.32 MPa,柠檬酸掺量为0.45%的硬化砂浆7 d拉伸黏接强度为0.89 MPa;对于未掺加柠檬酸硬化砂浆的各龄期自由膨胀率均大于掺量为0.45%的硬化砂浆。
Therapid-hardening repair mortar was made by white double-hardened sulphoaluminate cement,which is regarded as binding material.The influence of variety and dosage of retarder,dosage of water reducer,amiability modifier on the workability,mechanical properties,tensile bond strength and free swelling ratio of rapid-hardening repair mortar were studied.The result shows that:the mortar expansion presented single peak variation tendency with the dosage of citric acid(CA)and borax(PS)increasing.Former could control the operable time of fresh mortar effectively,however,the PS had poorer flexibility on this binding material.The compressive and flexural strength of hardened mortar before 24 h were gradually decreased with the dosage of CA increasing.The tensile bond strength was1.32 MPa at 7 d without adding CA,by contrast was 0.89 MPa with the 0.45% dosage of CA.The free swelling ratio of the hardened mortar without adding CA was bigger than the 0.45% dosage of CA at any age.
Therapid-hardening repair mortar was made by white double-hardened sulphoaluminate cement,which is regarded as binding material.The influence of variety and dosage of retarder,dosage of water reducer,amiability modifier on the workability,mechanical properties,tensile bond strength and free swelling ratio of rapid-hardening repair mortar were studied.The result shows that:the mortar expansion presented single peak variation tendency with the dosage of citric acid(CA)and borax(PS)increasing.Former could control the operable time of fresh mortar effectively,however,the PS had poorer flexibility on this binding material.The compressive and flexural strength of hardened mortar before 24 h were gradually decreased with the dosage of CA increasing.The tensile bond strength was1.32 MPa at 7 d without adding CA,by contrast was 0.89 MPa with the 0.45% dosage of CA.The free swelling ratio of the hardened mortar without adding CA was bigger than the 0.45% dosage of CA at any age.
引文
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[10]周妍,许文龙,黎学润,等.柠檬酸对阿利特-硫铝酸盐水泥凝结时间及水化过程的影响[J].混凝土,2014(12):76-79.
[11]董静,赵晓峰,王建平,等.柠檬酸复合型水泥混凝土外加剂的研制及对水泥性能的影响[J].检验检疫科学,2002(4):40-43.
[12]HU Y Y,LI W F,MA S U,et al.Influence of borax and citric acid on the hydration of calcium sulfoaluminatecement[J].Chemical Papers,2017(71):1909-1919.
[13]夏亮亮,倪涛,刘昭洋,等.酸醚比对聚羧酸减水剂共聚物组成及性能影响[J].新型建筑材料,2017(1):94-96.
[14]张巨松.混凝土学[M].哈尔滨:哈尔滨工业大学出版社,2011:128-143.
[2]闫兆柏.基于混凝土路面薄层病害的高性能修补材料与应用技术研究[D].西安:长安大学,2014(6).
[3]巴明芳,梁新奇,卢梦洁,等.复合调凝组分对硫铝酸盐水泥性能的影响及机理[J].材料导报,2015(10):133-136.
[4]桂雨,廖宜顺,蒋卓.硼砂对硫铝酸盐水泥水化行为的影响研究[J].硅酸盐通报,2016(11):3720-3723.
[5] Zajac,Maciej,Skocek Jan,Bullerjahn,et al.Effect of retarders on the early hydration of calcium-sulpho-aluminate(CSA)type cements[J].Cement and Concrete Research,2016,84:62-75.
[6] TAN H B,GUO Y L,ZOU F B,et al.Effect of borax on rheology of calcium sulphoaluminate cement paste in the presence of polycarboxylatesuperplasticizer[J].Construction and Building Materials,2017(139):277-285.
[7]杨克锐,张彩文,郭永辉,等.延缓硫铝酸盐水泥凝结的研究[J].硅酸盐学报,2002(2):155-161.
[8]周华新,刘加平,刘建忠.低碱硫铝酸盐水泥水化硬化过程的温度敏感性及其对策[J].混凝土,2011(12).9-11
[9]何春芳,叶近婷,高阳,等.三聚磷酸钠与柠檬酸钠钙螯合机理和螯合能力的对比分析[J].分子科学学报,2015(3):198-202.
[10]周妍,许文龙,黎学润,等.柠檬酸对阿利特-硫铝酸盐水泥凝结时间及水化过程的影响[J].混凝土,2014(12):76-79.
[11]董静,赵晓峰,王建平,等.柠檬酸复合型水泥混凝土外加剂的研制及对水泥性能的影响[J].检验检疫科学,2002(4):40-43.
[12]HU Y Y,LI W F,MA S U,et al.Influence of borax and citric acid on the hydration of calcium sulfoaluminatecement[J].Chemical Papers,2017(71):1909-1919.
[13]夏亮亮,倪涛,刘昭洋,等.酸醚比对聚羧酸减水剂共聚物组成及性能影响[J].新型建筑材料,2017(1):94-96.
[14]张巨松.混凝土学[M].哈尔滨:哈尔滨工业大学出版社,2011:128-143.