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| 1 | Effect of microlimestone on properties of self-consolidating concrete with manufactured sand and mineral admixture显示文摘Self-consolidating concrete(SCC)with manufactured sand(MSCC)is crucial to guarantee the quality of concrete construction technology and the associated property.The properties of MSCC with different microlimestone powder(MLS)replacements of retreated manufactured sand(TMsand)are investigated in this study.The result indicates that high-performance SCC,made using TMsand(TMSCC),achieved high workability,good mechanical properties,and durability by optimizing MLS content and adding fy ash and silica fume.In particular,the TMSCC with 12%MLS content exhibits the best workability,and the TMSCC with 4%MLS content has the highest strength in the late age,which is even better than that of SCC made with the river sand(R sand).Though MLS content slightly affects the hydration reaction of cement and mainly plays a role in the nucleation process in concrete structures compared to silica fume and fly ash,increasing MLS content can evidently have a significant impact on the early age hydration progress.TMsand with MLS content ranging from 8%to 12%may be a suitable alternative for the Rsand used in the SCC as fine aggregate.The obtained results can be used to promote the application of SCC made with manufactured sand and mineral admixtures for concrete-based infrastructure. | Fulin Qu Wengui Li Xiaohui Zeng Zhiyu Luo Kejin Wang Daichao Sheng | 2020 | Frontiers of Structural and Civil Engineering2020，14，6： | 1 |
| 2 | 基于一步随机游走法预测纳米颗粒在水泥基材料中的迁移显示文摘有效的建模方法对于相关实验中预测水泥基材料中纳米颗粒的行为和作用非常重要。根据水泥-纳米颗粒系统的微观结构特征,研究了基于单元格加权随机游走法的化学键与纳米颗粒在水泥基体内扩散过程之间建立统计学关系的可行性。LaSr_(0.5)C_(0.5)O_(3)(LSCO)纳米颗粒被用于开发离散系统,该系统考虑了纳米颗粒和水泥材料可能相互作用的每个单元反应。该随机模型是基于单元键的湮灭(损失)和产生(获得)建立的,并同时考虑了水泥基中纳米颗粒的化学反应和传输机理,以及水泥的水化过程。该方法可用于模拟复杂的基于二维水泥基材料中纳米粒子的迁移。 | Ali BAHARI Aref SADEGHI-NIK Elena CERRO-PRADA Adel SADEGHI-NIK Mandana ROODBARI Yan ZHUGE | 2021 | Journal of Central South University2021，28，6： | 1 |
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