This paper introduces a new method to measure whole cycle length change non-destructively and continuously using a digital image analysis system. The macroscale length changes of mortars containing different shrinkage-reducing admixture (SRA) dosages (0%, 1%, 2% and 5% by cement weight) were first determined using a complementary metal oxide semiconductor (CMOS) image sensor under alternating dry and wet curing conditions. After that, the length change was calculated using developed digital image processing technology (DIPT) software. After that, several significant conclusions could be drawn by combining with the results of systematic tests of the macroscopic and microscale physical properties of the cement mortar using X-ray diffraction, scanning electron microscopy, mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR) methods. The test results indicated that SRAs exhibited significant effects on the shrinkage inhibition of cement mortars, whereas the shrinkage reduction behaviour was also affected by varying the curing conditions. The MIP and NMR analyses demonstrated that SRAs reduced the irreversible shrinkage of the cement mortars by decreasing the volume percentage of the 3-50 nm pores and promoting the conversion of calcium silicate hydrate gel from an oligomeric to a high polymerization state thereby improving the volume stability of cement mortars.

中文翻译：

---

通过CMOS图像传感器监控结合了SRA的水泥砂浆的整个周期长度变化。

本文介绍了一种使用数字图像分析系统无损连续测量整个周期长度变化的新方法。首先使用互补金属氧化物半导体（CMOS）图像传感器在交替干燥和干燥条件下确定含有不同减缩剂（SRA）用量（水泥重量的0％，1％，2％和5％）的砂浆的宏观长度变化。湿固化条件。之后，使用开发的数字图像处理技术（DIPT）软件计算长度变化。然后，结合使用X射线衍射，扫描电子显微镜对水泥砂浆的宏观和微观物理性能进行系统测试的结果，可以得出几个重要结论。压汞法（MIP）和核磁共振（NMR）方法。测试结果表明，SRA对水泥砂浆的收缩抑制作用表现出显着的影响，而减少收缩的行为也受到改变固化条件的影响。MIP和NMR分析表明，SRA通过减少3-50 nm孔隙的体积百分比并促进硅酸钙水合物凝胶从低聚体转变为高聚合态而减少了水泥砂浆的不可逆收缩，从而改善了体积稳定性水泥砂浆。