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SSRN 2025年

作者： Palma e Silva, Arthur Aviz Capuzzo, Valdirene Maria Silva da Silva, Eugência Fonseca Agostinho, Lívia Borba Pereira, André Maués Brabo University of Brasília Postgraduate Program in Structures and Civil Construction DF BrasíliaCEP: 70910-900 Brazil Federal Fluminense University Department of Computer Science RJ Rio de JaneiroCEP: 22290-240 Brazil Federal University Uberlândia Postgraduate Program in Civil Engineering Minas Gerais UberlandiaCEP: 38408-100 Brazil

The use of superabsorbent polymers (SAPs) in combination with supplementary cementitious materials like metakaolin presents an opportunity to enhance concrete performance while addressing environmental concerns in construction, lowering CO2 emissions by clincker substitution. This study investigates the behavior of high-strength microconcrete incorporating SAPs and metakaolin, evaluating their feasibility and sustainability for construction applications. Three microconcrete and paste mixes were analyzed: a reference mix and two mixes containing 0.15% and 0.30% SAP by cement mass. All mixes included a 10% metakaolin substitution by cement mass and maintained the same water/cement ratio, without additional curing water for SAPs. Fresh-state tests assessed consistency and specific mass, while hardened-state tests measured elastic modulus. Autogenous shrinkage was evaluated through linear volumetric variation using dial gauges. Microstructural analysis of the pastes and microconcretes involved thermogravimetry, isothermal conduction calorimetry, and X-ray microtomography. The results highlight the beneficial effects of SAPs with metakaolin, including enhanced hardened state properties and refined pore structure, achieved despite the absence of extra curing water. SAPs contributed to increased pozzolanic activity in metakaolin, likely due to delayed water release from SAP desorption. Furthermore, SAPs effectively mitigated autogenous shrinkage, making their application in concrete mixes promising. These findings emphasize the dual benefit of improving concrete performance and advancing environmental sustainability, showcasing the potential of SAPs and metakaolin in producing high-performance, eco-friendly concrete solutions for the construction industry. © 2025, The Authors. All rights reserved.

关键词： Hardening

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Effects of superabsorbent polymers on autogenous shrinkage and microstructure in metakaolin-based cementitious materials

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Case Studies in construction Materials 2025年 22卷

作者： Palma e Silva, Arthur Aviz Capuzzo, Valdirene Maria Silva Silva, Eugênia Fonseca da Pereira, André Maués Brabo Agostinho, Lívia Borba Postgraduate Program in Structures and Civil Construction DF BrasíliaCEP: 70910-900 Brazil Department of Computer Science RJ Rio de JaneiroCEP: 22290-240 Brazil Postgraduate Program in Civil Engineering Uberlandia Minas GeraisCEP: 38408-100 Brazil

The incorporation of superabsorbent polymers (SAPs) and metakaolin in high-strength microconcrete offers a promising strategy to enhance performance while reducing environmental impact through clinker substitution. This study evaluates the feasibility and sustainability of SAP-modified microconcretes by analyzing fresh and hardened-state properties, autogenous shrinkage, and microstructural characteristics. Three microconcrete and paste mixes were investigated: a reference mix and two containing 0.15 % and 0.30 % SAP by cement mass, all with 10 % metakaolin substitution and a constant water/cement ratio without additional curing water. The results demonstrated that SAP effectively mitigated autogenous shrinkage, with MKSAP30 reducing shrinkage by 53 % compared to the reference mix. Microstructural analysis revealed a significant refinement in the pore network, reducing the average pore diameter from 508.76 µm (MKREF) to 214.65 µm (MKSAP30), despite an increase in total porosity. Moreover, SAP-modified mixes exhibited improved hydration efficiency, as evidenced by increased C-S-H formation and calcium hydroxide content in thermogravimetric analysis. The elastic modulus increased by 5.2 % and 13.9 % for MKSAP15 and MKSAP30, respectively, suggesting that enhanced hydration and pozzolanic activity offset the expected mechanical loss due to porosity. These findings highlight the dual benefits of SAP incorporation: improving concrete performance while promoting sustainability. The synergy between SAP and metakaolin enhances durability and mechanical properties, making SAP-modified microconcrete a viable solution for high-performance and environmentally friendly construction applications. © 2025 The Authors

关键词： Shrinkage

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Proposal of a set-based concurrent model for the construction industry

Proposal of a set-based concurrent model for the constructio...

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21st Annual Conference of the International Group for Lean construction 2013, IGLC 2013

作者： Vivan, André Luiz Paliari, José Carlos Postgraduate Program in Structures and Civil Construction Federal University of São Carlos - PPGECiv-UFSCar Brazil Federal University of São Carlos - UFSCar Department of Civil Engineering - DECiv Brazil

ISBN: (纸本)9781632660183

Concurrent Engineering (CE) is commonly employed in high-tech industries. CE can generally be applied by means of point-based and set-based strategies. However, although several related studies have been published, these strategies still lack systematic structuring for the operationalization of CE in the civil construction Industry (CCI). The purpose of this study, therefore, was to develop a set-based operational model based on the Lean Project Delivery System (LPDS), since this system is designed for practices in CE environments. This is a theoretical work developed from the rationale that the use of set-based concurrent models can more adequately model the use of LPDS-based CE. The main contribution of this paper is the proposal of a concurrent model for managing the development of the design process in the CCI. This work is considered important for the sector because it expands the theoretical bases of the areas of construction management and economics by proposing an operational model that contributes to a better understanding and use of Lean philosophy in the design process in the CCI.

关键词： Concurrent engineering

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