Uniaxial Tensile Properties and Compressive Strength of Limestone Calcined Clay-based Engineered Cementitious Composites
ZHOU Jiajia1, WANG Yifeng1, ZHAO Jun2,*, SONG Chenyang3, LYU Wenpu4
1 School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China 2 School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China 3 Henan Tianchang Electric Power Design Consulting Co., Ltd., Zhengzhou 450199, China 4 Henan Huatai New Materials Technology Co., Ltd., Nanyang 473001, Henan, China
Abstract: As a new type of building material, Engineered cementitious composite(ECC) has been widely concerned in the field of civil engineering due to its excellent tensile properties and durability. In this work, the effects of silica fume content, limestone calcined clay(LCC) content and sand-binder ratio on the uniaxial tensile properties and compressive strength of LCC-ECC were obtained by range analysis, contribution rate analysis and multi-factor interaction analysis. The results show that all specimens have obvious strain hardening and multi-crack cracking characteristics. The effects of various factors on the first-cracking strength, tensile strength, tensile toughness and compressive strength of LCC-ECC are sorted from largest to smallest as : LCC content＞silica fume content＞sand-binder ratio. With the increase of silica fume content and LCC content, the tensile strength and initial cracking strength of LCC-ECC gradually decrease. With the increase of sand-binder ratio, the tensile strength of LCC-ECC increases slightly, while the first-cracking strength decreases first and then increases. The tensile toughness and compressive strength of LCC-ECC decrease with the increase of LCC content. The tensile toughness increases first and then decreases with the increase of silica fume content and sand-binder ratio, and the compressive strength decreases first and then increases with the increase of silica fume content and sand-binder ratio. When the LCC content is 50%, the silica fume content is 0—0.1, and the sand-binder ratio is 0.2—0.3, LCC-ECC has excellent tensile properties. The fiber-matrix interface damage was analyzed by SEM, and it was found that the fibers were pulled out and broken. With the increase of LCC content, the bonding performance of fiber-matrix interface decreases, and more fibers are pulled out rather than broken. A large number of hydration products are attached to the surface of the extracted fiber, indicating that the fiber can still play a good bridging role even if a large amount of LCC is added.
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2026, Vol. 40 
