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通过超声测试对碱激发水泥混合物的凝结时间和强度进行监测

Setting Time and Strength Monitoring of Alkali-Activated Cement Mixtures by Ultrasonic Testing.

作者信息

Tekle Biruk Hailu, Hertwig Ludwig, Holschemacher Klaus

机构信息

Structural Concrete Institute (IfB), Leipzig University of Applied Sciences (HTWK Leipzig), Karl-Liebknecht-Str. 132, 04277 Leipzig, Germany.

出版信息

Materials (Basel). 2021 Apr 10;14(8):1889. doi: 10.3390/ma14081889.

DOI:10.3390/ma14081889
PMID:33920174
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8069208/
Abstract

Alkali-activated cement (AAC) is a promising binder that replaces ordinary Portland cement (OPC). In this study, the development of setting time and strength of AAC mixes were studied using ultrasonic testing method. The test results were compared with traditional Vicat setting time and compressive and flexural strengths. The findings showed that setting times and strengths have a strong correlation with ultrasonic velocity curve. The initial setting time corresponds well with the ultrasonic velocity curve's dormant period, and the final setting time with the time it takes to reach the velocity curve's maximum acceleration. Both setting times also showed a correlation with the value of the maximum acceleration. An exponential relation was found between the ultrasonic velocity and the compressive and flexural strengths. The effect of binder content, alkaline solid to binder ratio (AS/B), sodium silicate to sodium hydroxide solids ratio (SS/SH), and total water to total solid binder ratio (TW/TS) on the strength and setting time are also studied using Taguchi method of experimental design. AS/B ratio showed a significant influence on the setting time of AAC while TW/TS ratio showed only a minor effect. The ultrasonic velocities were able to capture the effect of the different parameters similar to the compressive strength. The velocity decreased mainly with the increase of TW/TS ratio and binder content, while AS/B and SS/SH ratios showed a lower influence.

摘要

碱激发水泥（AAC）是一种有前景的胶凝材料，可替代普通硅酸盐水泥（OPC）。在本研究中，采用超声检测方法研究了AAC混合料的凝结时间和强度发展情况。将试验结果与传统的维卡凝结时间以及抗压强度和抗折强度进行了比较。研究结果表明，凝结时间和强度与超声速度曲线有很强的相关性。初凝时间与超声速度曲线的潜伏期对应良好，终凝时间与达到速度曲线最大加速度所需的时间对应良好。两种凝结时间也与最大加速度值相关。发现超声速度与抗压强度和抗折强度之间存在指数关系。还采用田口试验设计方法研究了胶凝材料含量、碱固体与胶凝材料比（AS/B）、硅酸钠与氢氧化钠固体比（SS/SH）以及总水与总固体胶凝材料比（TW/TS）对强度和凝结时间的影响。AS/B比对AAC的凝结时间有显著影响，而TW/TS比的影响较小。超声速度能够捕捉到不同参数对强度的影响，与抗压强度类似。速度主要随着TW/TS比和胶凝材料含量的增加而降低，而AS/B和SS/SH比的影响较小。

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