利用羧基修饰碳纳米管与碳酸化反应改善水泥净浆强度和微观结构的研究

Study on Utilization of Carboxyl Group Decorated Carbon Nanotubes and Carbonation Reaction for Improving Strengths and Microstructures of Cement Paste.

作者信息

Yan Xiantong, Cui Hongzhi, Qin Qinghua, Tang Waiching, Zhou Xiangming

机构信息

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China.

Research School of Engineering, Australian National University, Canberra 2601, ACT, Australia.

出版信息

Nanomaterials (Basel). 2016 Aug 19;6(8):153. doi: 10.3390/nano6080153.

DOI:10.3390/nano6080153

PMID:28335281

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5224618/

Abstract

Carbon nanotubes (CNTs) have excellent mechanical properties and can be used to reinforce cement-based materials. On the other hand, the reaction product of carbonation with hydroxides in hydrated cement paste can reduce the porosity of cement-based materials. In this study, a novel method to improve the strength of cement paste was developed through a synergy of carbon nanotubes decorated with carboxyl group and carbonation reactions. The experimental results showed that the carboxyl group (-COOH) of decorated carbon nanotubes and the surfactant can control the morphology of the calcium carbonate crystal of carbonation products in hydrated cement paste. The spindle-like calcium carbonate crystals showed great morphological differences from those observed in the conventional carbonation of cement paste. The spindle-like calcium carbonate crystals can serve as fiber-like reinforcements to reinforce the cement paste. By the synergy of the carbon nanotubes and carbonation reactions, the compressive and flexural strengths of cement paste were significantly improved and increased by 14% and 55%, respectively, when compared to those of plain cement paste.

摘要

碳纳米管（CNTs）具有优异的力学性能，可用于增强水泥基材料。另一方面，水化水泥浆体中氢氧化合物的碳化反应产物可降低水泥基材料的孔隙率。在本研究中，通过羧基修饰的碳纳米管与碳化反应的协同作用，开发了一种提高水泥浆体强度的新方法。实验结果表明，修饰碳纳米管的羧基（-COOH）和表面活性剂可控制水化水泥浆体中碳化产物碳酸钙晶体的形态。纺锤状碳酸钙晶体与传统水泥浆体碳化中观察到的晶体形态有很大差异。纺锤状碳酸钙晶体可作为纤维状增强材料增强水泥浆体。通过碳纳米管与碳化反应的协同作用，与普通水泥浆体相比，水泥浆体的抗压强度和抗折强度显著提高，分别提高了14%和55%。