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首页> 外文期刊>Construction and Building Materials >Understanding the porous aggregates carrier effect on reducing autogenous shrinkage of Ultra-High Performance Concrete (UHPC) based on response surface method
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Understanding the porous aggregates carrier effect on reducing autogenous shrinkage of Ultra-High Performance Concrete (UHPC) based on response surface method

机译：基于响应面方法了解多孔骨料载体对降低超高性能混凝土（UHPC）自生收缩的影响

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摘要

In this study, the porous aggregates carrier effect on reducing autogenous shrinkage and optimizing microstructure of Ultra-High Performance Concrete (UHPC) is investigated, including experimental study and mechanism analysis. Based on the modified dense particle packing model (Andreasen & Andersen model), the UHPC skeleton is designed. Then, the shrinkage reducing admixture (SRA) is absorbed by porous aggregates (PA), and the pretreated PA is used to replace the fine aggregates in UHPC. After that, a series of experiments are executed for the developed UHPC, including flowability, setting times, mechanical properties, autogenous shrinkage and microstructure development. Accordingly, based on the obtained experimental results, the Response Surface Methods (RSM) is utilized to get the optimized PA content and SRA solution concentration. The obtained results show that PA acting as carrier is beneficial to reduce the adverse effect of direct addition of SRA. Moreover, when the added PA content is 25% and the SRA solution concentration is 70%, the developed UHPC has advanced properties. Therefore, on the basis of on the method proposed in this study, it is possible to effectively reduce the UHPC autogenous shrinkage without sacrificing its fresh behavior, mechanical properties and dense microstructure. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在这项研究中，研究了多孔骨料载体对减少自收缩和优化超高性能混凝土（UHPC）微观结构的影响，包括实验研究和机理分析。基于改进的密集粒子堆积模型（Andreasen＆Andersen模型），设计了UHPC骨架。然后，减少收缩的外加剂（SRA）被多孔骨料（PA）吸收，并使用预处理的PA代替UHPC中的细骨料。之后，针对已开发的UHPC进行了一系列实验，包括流动性，凝固时间，机械性能，自生收缩和微结构发展。因此，基于获得的实验结果，利用响应面法（RSM）获得了最佳的PA含量和SRA溶液浓度。获得的结果表明，PA作为载体有利于减少直接添加SRA的不利影响。此外，当添加的PA含量为25％，SRA溶液浓度为70％时，开发的UHPC具有先进的性能。因此，基于本研究提出的方法，可以在不牺牲其新鲜性能，力学性能和致密微观结构的情况下，有效地减少UHPC自生收缩。 （C）2019 Elsevier Ltd.保留所有权利。

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