石膏对阿利特改性硫铝酸钙水泥水化和硬化性能的影响

Effect of Gypsum on Hydration and Hardening Properties of Alite Modified Calcium Sulfoaluminate Cement.

作者信息

Li Pei, Ma Zhiqiang, Zhang Zhong, Li Xumin, Lu Xiaolei, Hou Pengkun, Du Peng

机构信息

Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China.

出版信息

Materials (Basel). 2019 Sep 25;12(19):3131. doi: 10.3390/ma12193131.

DOI:10.3390/ma12193131

PMID:31557933

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6804062/

Abstract

Calcium sulphoaluminate cement (CSA) has the characteristics of quick hardening, high early strength and high impermeability, however its strength growth persistence in the middle and late stages (after the age of 3 days) is poor. In order to improve this disadvantage, the pilot production of alite (CS) modified CSA (AMCSA) clinker was carried out by liquid phase manipulation and barium ion doping technology. The effects of different dosages of gypsum on the hydration and hardening properties of AMCSA, such as setting time, hydration rate, compressive strength and hydration products, were studied. The results show that the mineral content of ye'elimite, CS, CS and iron phase in the calcined AMCSA clinker are 48.5 wt.%, 32.6 wt.%, 11.7 wt.% and 7.2 wt.% respectively, which are close to the designed mineral composition. The stable coexistence of ye'elimite and CS in the same clinker system is realized. The initial and final setting time of AMCSA are retarded with the increasing gypsum dosage. When the gypsum dosage is 15 wt.% under the experimental conditions in this study, the AMCSA mortar reaches the highest compressive strength at every age. The strength of AMCSA mortar at 28 days is still significantly improved compared with that at 3 days, which indicates that the shortcoming of the low strength growth persistence of CSA in the middle and late stages is improved.

摘要

硫铝酸钙水泥（CSA）具有凝结硬化快、早期强度高、抗渗性好等特点，但其强度增长在中后期（3天龄期后）持续性较差。为改善这一缺点，采用液相机理调控和钡离子掺杂技术进行了阿利特（CS）改性CSA（AMCSA）熟料的中试生产。研究了不同石膏掺量对AMCSA水化硬化性能的影响，如凝结时间、水化速率、抗压强度和水化产物等。结果表明，煅烧后的AMCSA熟料中硫铝酸钙、CS、CS和铁相的矿物含量分别为48.5 wt.%、32.6 wt.%、11.7 wt.%和7.2 wt.%，接近设计矿物组成。实现了硫铝酸钙和CS在同一熟料体系中的稳定共存。随着石膏掺量的增加，AMCSA的初凝和终凝时间均有所延缓。在本研究试验条件下，当石膏掺量为15 wt.%时，AMCSA砂浆在各龄期均达到最高抗压强度。与3天龄期相比，AMCSA砂浆28天龄期的强度仍有显著提高，这表明改善了CSA中后期强度增长持续性差的缺点。