堆石混凝土导热系数影响因素试验研究

Influencing Factors and Research Progress of Thermal Conductivity of Rock-Fill Concrete

堆石混凝土(Rock-Filled Concrete, RFC)作为一种新型的低碳环保混凝土,由大块堆石(粒径 > 300 mm)和自密实混凝土(Self-Compacting, SCC)组成,且是一种非均质材料,堆石混凝土因掺入大粒径的骨料从而使其内部微观结构、力学性能与热力学性能都与普通混凝土有所区别。导热系数是堆石混凝土温控防裂的重要参数指标,本文针对影响堆石混凝土导热性能的主要影响因素,如堆石混凝土中堆石率、堆石种类以及各种环境因素等,来分析堆石混凝土导热系数的变化规律。本文进行导热系数试验,对堆石混凝土导热系数的影响因素(堆石率)进行研究,结果表明:随着堆石率的增大,堆石混凝土的导热系数也会随之增大。Rock-fill concrete (RFC) as a new type of low-carbon environmental protection concrete. It is composed of massive rock-fill (grain size > 300 mm) and self compacting concrete (SCC), and it is a heterogeneous material. The internal microstructure, mechanical properties and thermodynamic properties of rock fill concrete are different from ordinary concrete due to the addition of large size aggregates. At present, there are many researches on the mechanical properties of rock-fill concrete, but few on the thermodynamic properties. Thermal conductivity is a key index for temperature control and crack prevention of rock-fill concrete. Aiming at the main influencing factors of thermal conductivity of rock-fill concrete, such as rock-fill rate, rock-fill type and various environmental factors in rock-fill concrete, the variation law of thermal conductivity of rock-fill concrete is analyzed. Some studies show that the thermal conductivity of rock-fill concrete is directly affected by the rock-fill rate, and the thermal conductivity of rock-fill concrete increases with the increase of the rock-fill rate;in addition, the thermal conductivity of different rock-fill types is also different.