Concrete shrinkage affects the overall stability and long-term service performance of the structures. Lightweight aggregates (LWAs) with a porous structure are an ideal internal curing material to mitigate concrete shrinkage. Nevertheless, the low elastic modulus of LWAs has a negative impact on concrete shrinkage. In order to clarify the influences of LWAs in the high strength lightweight aggregate concrete (HSLC) on its shrinkage performance, the compressive strength, internal relative humidity (IRH), elastic modulus, and autogenous shrinkage (AS) of HSLC were analyzed experimentally in this study. The correlation of these parameters was investigated. As indicated by the results, compressive strength and elastic modulus were negatively related to the content of LWAs. The 28-day AS and IRH of HSLC and the critical moment of IRH increased by 3.9%, 20.2% and 36 h, respectively, when the content of LWAs increased from 0% to 100%. A linear relationship between AS and compressive strength and an exponential relationship between AS and IRH were established. Additionally, a shrinkage prediction model considering IRH of concrete and water absorption by LWAs was proposed for HSLC.

混凝土收缩影响结构的整体稳定性和长期使用性能。具有多孔结构的轻骨料(LWA)是一种理想的内部固化材料，可减轻混凝土收缩。然而，轻骨料的低弹性模量对混凝土收缩有负面影响。为了阐明轻骨料在高强轻骨料混凝土（HSLC）中对其收缩性能的影响，抗压强度本研究通过实验分析了 HSLC 的内部相对湿度 (IRH)、弹性模量和自收缩 (AS)。研究了这些参数的相关性。结果表明，抗压强度和弹性模量与 LWA 的含量呈负相关。当LWAs含量从0%增加到100%时，HSLC的28天AS和IRH以及IRH的临界时刻分别增加了3.9%、20.2%和36 h。建立了 AS 与抗压强度之间的线性关系以及 AS 与 IRH 之间的指数关系。此外，还为 HSLC 提出了考虑混凝土 IRH 和 LWA 吸水率的收缩预测模型。