Mechanical Behavior and Transport Properties of Cementitious Composites Reinforced with Carbon Nanotubes

被引：42

作者：

Ahmed, Hawreen ^{[1
]}

Bogas, Jose Alexandre ^{[1
]}

Guedes, Mafalda ^{[2
,3
,4
]}

机构：

[1] Univ Lisbon, Inst Super Tecn, DECivil, Civil Engn Res & Innovat Sustainabil, Av Rovisco Pais, P-1049001 Lisbon, Portugal

[2] Inst Politecn Setubal, Ctr Prod Dev & Technol Transfer, P-2914761 Estefanilha, Setubal, Portugal

[3] Inst Politecn Setubal, Dept Mech Engn, Setubal Sch Technol, P-2914761 Estefanilha, Setubal, Portugal

[4] Univ Lisbon, Inst Super Tecn, Ctr Phys & Engn Adv Mat, Av Rovisco Pais 1, P-1049001 Lisbon, Portugal

来源：

JOURNAL OF MATERIALS IN CIVIL ENGINEERING | 2018年 / 30卷 / 10期

关键词：

Carbon nanotube; Cementitious composite; Mechanical strength; Water absorption; Shrinkage; Microstructure; Thermogravimetric analysis; PORTLAND-CEMENT; FLEXURAL STRENGTH; DRYING SHRINKAGE; DISPERSION; MICROSTRUCTURE; CONCRETE; PASTE; NANOPARTICLES; DEHYDRATION; TEMPERATURE;

D O I：

10.1061/(ASCE)MT.1943-5533.0002470

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The mechanical behavior and transport properties of cement pastes reinforced with various types and amounts of pristine and functionalized carbon nanotubes (CNTs) are characterized for different water to cement (w/c) ratios. The flexural strength, compressive strength, and dynamic modulus of elasticity of CNT-reinforced cement pastes were up to 38%, 58%, and 22% higher than those of unreinforced pastes, respectively. CNTs were also effective in decreasing the drying shrinkage of cement pastes to 87% lower than that of reference pastes at early ages. Water absorption by immersion and capillary absorption could be also reduced as much as 16% and 38%, respectively. Microstructure and thermogravimetric analysis evidenced effective dispersion, microcrack bridging, and nucleation effects of CNT-reinforced cement matrices. Results show that depending on the type and dispersion procedure, CNTs effectively contribute for the reinforcement of cementitious materials, regardless of w/c ratio.

引用

页数：14

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