Effect of Nano-particles on Strength of UHPC Under Different Process Conditions
LONG Guangcheng1,*, YANG Kai1, CHENG Zhiqing1,2, WANG Huihui1, SHI Ye1, XIE Youjun1
1 School of Civil Engineering, Central South University, Changsha 410075, China 2 Yunnan Academy of Transportation Sciences Co., Ltd., Kunming 650011, China
Abstract: In order to fully play the enhancement effect of nano-particles on UHPC, the influences of three kinds of nano-particles including nano-SiO2, nano-Al2O3 and nano-CaCO3 on the mechanical strength of UHPC were investigated by a serials of experiments in this work, respectively. And three curing conditions such as standard curing at 20 ℃, steam curing at 80 ℃ and autoclave curing at 180 ℃ as well as the pressure molding process before setting of UHPC were adopted in this experiments. Moreover, the corresponding mechanism was discussed. The results show that nano-SiO2, nano-Al2O3 and nano-CaCO3 all exhibited the good enhancement effect on the compressive strength of UHPC. The enhancement effect of nano-SiO2 on mechanical strength of UHPC was best, which was followed by nano-Al2O3 and nano-CaCO3. The corresponding optimum content of nano-SiO2 was about 1.5wt% under the condition of conventional vibrating compaction and was about 2.0wt% for the condition of pressure molding process. The nucleation effect of nano-particles on promoting hydration of cement and their own high chemical activity were the main reasons for the high strength growth rate of UHPC with nano-particles under standard curing condition. Furthermore, the mechanical strength of UHPC with nano-particles was significantly enhanced by the combination of pressure molding process and steam curing at 80 ℃. Both the incorporation of nano-particles and employment of pressure molding process could effectively improve the pore structure of UHPC.
龙广成, 杨恺, 程智清, 王慧慧, 石晔, 谢友均. 不同工艺制度下纳米颗粒对UHPC强度的影响[J]. 材料导报, 2022, 36(13): 21040093-6.
LONG Guangcheng, YANG Kai, CHENG Zhiqing, WANG Huihui, SHI Ye, XIE Youjun. Effect of Nano-particles on Strength of UHPC Under Different Process Conditions. Materials Reports, 2022, 36(13): 21040093-6.
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2022, Vol. 36 
