Development of cost-effective and energy – efficient materials is an on-going effort in construction sector. For this purpose, researchers have focused on utilizing various industrial by – products and nano thermal insulation materials in cement – based mixtures in recent years. This paper presents a comparative study on mechanical, pore structure, thermal conductivity properties and microstructure morphology of hybrid mortar mixtures containing petroleum coke as a partial replacement of sand (0%, 10% and 15%, by weight) and silica aerogel powder as a cement additive (0.35%, 0.7% and 1.0%, by weight). Results showed that a thermal conductivity reduction of 21.83% was determined at an aerogel content of 0.35% with higher compressive, flexural strengths and toughness capacities. Moreover, there was an insulation enhancement in the petroleum coke-incorporated samples up to 33% at a replacement level of 15%. However, in the case of equivalent thermal conductivity, compressive toughness and post - peak toughness capacities of aerogel-incorporated mixtures were higher up to respectively 20% and 17% in comparison to petroleum coke-incorporated mixtures. This research opens up a new perspective in the design of hybrid cement mortars containing silica aerogel powder and petroleum coke with the optimization of mechanical-thermal insulation properties.

开发具有成本效益和能源高效的材料是建筑行业的一项持续努力。为此，近年来，研究人员集中于利用各种工业副产品和水泥基混合物中的纳米隔热材料。本文对含石油焦（以重量计分别为0％，10％和15％）和二氧化硅气凝胶粉的部分替代品的石油焦的混合砂浆混合物的力学，孔结构，导热性能和微观结构形态进行了比较研究。水泥添加剂（按重量计为0.35％，0.7％和1.0％）。结果表明，在气凝胶含量为0.35％的情况下，具有更高的压缩，挠曲强度和韧性，导热系数降低了21.83％。此外，掺入石油焦的样品的绝热性能提高了33％，替换水平为15％。但是，在等效导热系数的情况下，与掺有石油焦的混合物​​相比，掺有气凝胶的混合物的压缩韧性和峰后韧性分别更高，分别高达20％和17％。这项研究为包含二氧化硅气凝胶粉和石油焦的混合水泥砂浆的设计开辟了新的视角，并优化了机械隔热性能。与掺有石油焦的混合物​​相比，掺有气凝胶的混合物的压缩韧性和峰后韧性分别更高，分别高达20％和17％。这项研究为包含二氧化硅气凝胶粉和石油焦的混合水泥砂浆的设计开辟了新的视角，并优化了机械隔热性能。与掺有石油焦的混合物​​相比，掺有气凝胶的混合物的压缩韧性和峰后韧性分别更高，分别高达20％和17％。这项研究为包含二氧化硅气凝胶粉和石油焦的混合水泥砂浆的设计开辟了新的视角，并优化了机械隔热性能。