摘要
混凝土是土木工程中使用最为广泛的材料之一,当今普通混凝土已无法完全满足超限建筑业的需求,因此高性能纳米SiO_(2)改性混凝土应运而生。为更好地了解纳米SiO_(2)改性混凝土的各项性能,对其和易性、凝结时间、抗压强度和抗氯离子渗透性的研究进行了回顾和总结。相关研究表明:在混凝土中添加适量纳米SiO_(2),可有效提高混凝土的抗压强度,且对早期抗压强度的影响大于后期的影响,但纳米SiO_(2)含量过高会使混凝土的抗压强度下降;适量的纳米SiO_(2),还可以有效填充混凝土中的孔隙,改善其微观结构,提高混凝土的抗氯离子渗透性;然而,混凝土中掺入纳米SiO_(2),会缩短其初凝时间和终凝时间,同时也会大幅影响混凝土的和易性,使之不利于长距离输送,增加施工难度。
The nano-SiO_(2)modified concrete(NSC)was applied in the field of limit-beyond high-rise building.For better understand the properties of NSC,the workability,setting time,compressive strength and chloride penetration resistance of NSC were reviewed and summarized.The previous researches showed that the compressive strength with an appropriate amount of nano-SiO_(2)could be effectively improved,and the influence on the early compressive strength is greater than the long term one.nano-SiO_(2)could also be filled in the concrete voids,improving microstructure and the chloride penetration resistance of concrete.However,the setting time of concrete with nano-SiO_(2)reduced leading to unfavourable workability of concrete,which was not conducive to long-distance transportation and construction.
作者
赖祺
李古
LAI Qi;LI Gu(School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Civil Engineering,Guangzhou 510006,China)
出处
《材料研究与应用》
CAS
2022年第2期198-204,共7页
Materials Research and Application
基金
广东省自然科学基金项目(2021A1515011747)
广东省普通高校特色创新项目(2017KTSCX061)。
