Yongjia He

TL;DR: In this paper, a link between mass diffusivity in Portland cement paste and its microstructure was presented, where X-ray computed microtomography (μCT) was applied to derive the 3D images of cement paste specimens with water-to-cement (w/c) ratio 0.50 at curing ages of 1, 3, 7, 28, 28 and 120 days at a resolution of 0.485μm/voxel.

TL;DR: In this paper, the effect of curing regimes on the mechanical properties, hydration and microstructure of ultra-high performance concrete (UHPC) has been investigated and the results demonstrate that mechanical properties are strengthened by increasing curing temperature, but the flexural/tensile to compressive strength ratio shows an unusual increasing tendency with increasing temperature and compressivestrength, which is opposite to normal concrete.

TL;DR: In this article, the expansion mechanisms of CaO based expansive agent (CSA-CaO EA) on the volume stability of ultra-high performance concrete (UHPC) were systematically studied.

TL;DR: In this paper, a green Ultra-High Performance Concrete (UHPC) by incorporating recycled construction waste cementitious material (RCWCM) is addressed, where the DCP is used to gradually replace the cement and included in the design of UHPC based on Modified Andreasen & Andersen (MAA) particle packing model.

TL;DR: In this article, the idea of preparing an electromagnetic wave absorption cement-based composite using nano-Fe3O4 magnetic fluid as electromagnetic wave absorber is proposed, and the composite shows excellent absorption properties.