Reinforcing Effect of Carbon Nanotubes/Surfactant Dispersions in Portland Cement Pastes

被引：17

作者：

Mendoza Reales, Oscar A. ^{[1
]}

Ocampo, Caterin ^{[2
]}

Arias Jaramillo, Yhan Paul ^{[2
]}

Ochoa Botero, Juan Carlos ^{[2
]}

Hernan Quintero, Jorge ^{[3
]}

Silva, Emilio C. C. M. ^{[4
]}

Toledo Filho, Romildo Dias ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, Rio De Janeiro, RJ, Brazil

[2] Univ Nacl Colombia, Medellin, Colombia

[3] Univ Medellin, Medellin, Colombia

[4] Petrobras Petr Brasileiro SA, Rio De Janeiro, RJ, Brazil

来源：

ADVANCES IN CIVIL ENGINEERING | 2018年 / 2018卷

关键词：

MECHANICAL-PROPERTIES; CONCRETE COLUMNS; NANOTUBES; BEHAVIOR; TOUGHNESS; STRENGTH;

D O I：

10.1155/2018/2057940

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Decoupling the individual effects of multiwalled carbon nanotubes (MWCNTs) and surfactants when used as reinforcement materials in cement-based composites is aimed in this study. Powder MWCNTs were dispersed in deionized water using different types of surfactants as chemical dispersing agents and an ultrasonic tip processor. Cement pastes with carbon nanotubes additions of 0.15% by mass of cement were produced in two steps: first, the MWCNT/surfactant dispersions were combined with the mixing water, and then, cement was added and mixed until a homogeneous paste was obtained. Mechanical properties of the pastes cured at 7 days were measured, and their fracture behavior was characterized using the linear elastic finite element analysis. It was found that the reinforcing effect of MWCNT was masked by the negative effect of surfactants in the cement matrix; nevertheless, nanotubes were capable of increasing both stress and strain capacity of the composite by controlling the crack propagation process at the tip of the crack.

引用

页数：9

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