Investigation of the microstructure of Portland cement pastes with functionalized nanosilica with different contents of shrinkage-reducing additive

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-02-07 DOI:10.1016/j.conbuildmat.2025.139991

Yuri Sotero Bomfim Fraga , Gabriel Lima Oliveira Martins , João Henrique da Silva Rêgo , Amparo Moragues Terrades , Moisés Frías Rojas

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引用次数: 0

Abstract

This research aims to verify the effect of NS functionalization with different mass ratios of shrinkage reducing additive (SRA) in cementitious composites. Four functionalized nanosilicas were produced, one with amine groups (NSFA) and three with different mass ratios of SRA/NSFA (5 %, 10 % and 15 %), named NSFArr. The properties of six different pastes were investigated, one produced only with Portland cement CP V-ARI and five replacing 1 % of Portland cement by NS and the mentioned functionalized nanosilicas. The compressive strength at 2, 7 and 28 days of hydration, the amount of CH and C-S-H through the XRD, TGA and FTIR techniques, as well as the porosity at 28 days of hydration through mercury intrusion porosimetry (MIP) were evaluated. The functionalization of NSFArr with different amounts of SRA caused a change in the hydration kinetics of the pastes, which impacted the mechanical performance and porous structure of the pastes. It was possible to observe an increase in the mechanical performance of the pastes with NSFArr at 28 days compared to the paste with NS, making this material promising for use in high-performance concretes.

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不同掺量纳米二氧化硅功能化硅酸盐水泥的微观结构研究

本研究旨在验证不同质量比的减缩添加剂（SRA）在胶凝复合材料中对NS功能化的影响。制备了四种功能化纳米二氧化硅，其中一种具有胺基（NSFA），三种具有不同质量比（5 %，10 %和15 %）的SRA/NSFA，命名为NSFArr。研究了6种不同水泥的性能，其中1种仅用硅酸盐水泥CP V-ARI制备，5种用NS和上述功能化纳米二氧化硅代替1 %的硅酸盐水泥。通过XRD、TGA、FTIR等技术对水化后2、7、28 d的抗压强度、CH、C-S-H的含量以及MIP等技术对水化后28 d的孔隙度进行了评价。不同SRA用量的NSFArr功能化会引起膏体水化动力学的变化，从而影响膏体的力学性能和多孔结构。与添加NSFArr的膏体相比，可以观察到添加NSFArr的膏体在28天后的力学性能有所提高，这使得这种材料有望用于高性能混凝土。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.