This study aims to predict the autogenous shrinkage of alkali-activated concrete (AAC) based on slag and fly ash. A variety of analytical and numerical models are available for the prediction of autogenous shrinkage of ordinary Portland cement (OPC) concrete, but these models are found to show dramatic discrepancies when applied for AAC due to the different behaviours of these two systems. In this study, a new numerical approach is developed to predict the autogenous shrinkage of alkali-activated slag (AAS) and alkali-activated slag-fly ash (AASF) concrete from the experimental results on corresponding paste. In this approach, the creep of AAS and AASF and the restraining effect of the aggregate are particularly considered. By this approach, a fairly good prediction is obtained. Moreover, the microcracking in paste caused by restraining aggregates is evaluated. The results indicate that AAC is subjected to high tendency of development of microcracking.

本研究旨在预测基于矿渣和粉煤灰的碱活化混凝土（AAC）的自生收缩率。可以使用多种分析和数值模型来预测普通波特兰水泥（OPC）混凝土的自生收缩率，但是由于这两种系统的行为不同，发现这些模型在应用于AAC时显示出巨大的差异。在这项研究中，开发了一种新的数值方法来根据相应糊状物上的实验结果来预测碱活化矿渣（AAS）和碱活化矿渣粉煤灰（AASF）混凝土的自发收缩。在这种方法中，特别要考虑AAS和AASF的蠕变以及骨料的抑制作用。通过这种方法，可以获得相当好的预测。此外，评估了由于限制聚集体而导致的糊剂微裂纹。结果表明，AAC发生微裂纹的可能性很高。