In this paper, we study the influence ofeco materials for roof insulation and fiber-reinforced mortar coatings on cooling loads of a home in dry tropical climate. The walls of the house are made of cinderblock or late...In this paper, we study the influence ofeco materials for roof insulation and fiber-reinforced mortar coatings on cooling loads of a home in dry tropical climate. The walls of the house are made of cinderblock or laterite and the insulating material of a roof panel is made with lime （24%）, cement （6%）, water （50%） of vegetable fibers hibiscus sabdariffa （16%）, tree widespread in Burkina Faso and sugar cane bagasse （4%）. This panel roof insulation and the fiber-reinforced mortar were characterized at the Laboratory of Physics and Chemistry of the environment by the hot plate method. The building is modeled in TRNSYS using climate data from the city of Ouagadougou. The results obtained show that in the warmer months of the year, that is to say in March and April, the relative differences between heat gains the configurations ＂breeze block-coating mortar and roof not insulated＂ and ＂laterite- fiber-reinforced mortar coating and insulated roof＇ vary between 15.6% and 16.8%. The configuration ＂laterite-fiber-reinforced mortar coating and insulated roof allows a reduction of annual heat gains of 15.5% compared to the configuration ＂breeze block-coating mortar and roof not insulated＂.展开更多
自新冠疫情爆发以来,废弃一次性医用口罩(disposable medical masks,DMMs)处理问题日益严峻,通过制备DMMs纤维增强砂浆,不仅可以大量回收利用一次性医用口罩,还可以提高砂浆的抗裂性能。研究了DMMs纤维长度、掺量对砂浆的力学性能、干...自新冠疫情爆发以来,废弃一次性医用口罩(disposable medical masks,DMMs)处理问题日益严峻,通过制备DMMs纤维增强砂浆,不仅可以大量回收利用一次性医用口罩,还可以提高砂浆的抗裂性能。研究了DMMs纤维长度、掺量对砂浆的力学性能、干燥收缩以及早期抗裂性能的影响,验证其应用于建筑材料的可行性。结果表明:DMMs纤维的掺入会略微降低砂浆的抗压强度;DMMs纤维长度增加会降低砂浆抗折强度的提升效果;砂浆的后期抗折强度随着DMMs纤维掺量增加呈现先升高后下降的趋势,DMMs纤维长度为15 mm、掺量为1.00%时,28 d抗折强度提升最高,相比基准砂浆提高了19.39%;而随着掺量增加,砂浆的干缩率持续下降,抗裂性能逐渐提高,DMMs纤维掺量为1.25%时,砂浆表面24 h内无裂缝出现。展开更多
基于Li Fa Ming的平行棒模型,对短钢纤维增强砂浆的平板试件,在直接拉伸条件下的破坏行为进行了分析,假设试件由N根相互平行的复合棒组成,每根复合棒又由一根纤维棒和S根砂浆棒组成,考虑纤维在基体中分布的方向因子和长度因子,砂浆的损...基于Li Fa Ming的平行棒模型,对短钢纤维增强砂浆的平板试件,在直接拉伸条件下的破坏行为进行了分析,假设试件由N根相互平行的复合棒组成,每根复合棒又由一根纤维棒和S根砂浆棒组成,考虑纤维在基体中分布的方向因子和长度因子,砂浆的损伤可按连续损伤力学进行处理,将Loland模型和Mazars模型加以改进来描述。依据多根纤维的拉拔模型,假定纤维与基体间界面的损伤由纤维脱粘长度与纤维插入长度的比值来描述,复合材料的损伤包括基体的损伤和纤维的损伤,借助已有的试验数据和文献资料来确定本构模型中的各种参数,成功建立了短钢纤维增强砂浆直接拉伸应力-应变全曲线模型。所建模型与试件在直接拉伸试验下的应力-应变全曲线进行了对比,结果较为吻合。展开更多
文摘In this paper, we study the influence ofeco materials for roof insulation and fiber-reinforced mortar coatings on cooling loads of a home in dry tropical climate. The walls of the house are made of cinderblock or laterite and the insulating material of a roof panel is made with lime （24%）, cement （6%）, water （50%） of vegetable fibers hibiscus sabdariffa （16%）, tree widespread in Burkina Faso and sugar cane bagasse （4%）. This panel roof insulation and the fiber-reinforced mortar were characterized at the Laboratory of Physics and Chemistry of the environment by the hot plate method. The building is modeled in TRNSYS using climate data from the city of Ouagadougou. The results obtained show that in the warmer months of the year, that is to say in March and April, the relative differences between heat gains the configurations ＂breeze block-coating mortar and roof not insulated＂ and ＂laterite- fiber-reinforced mortar coating and insulated roof＇ vary between 15.6% and 16.8%. The configuration ＂laterite-fiber-reinforced mortar coating and insulated roof allows a reduction of annual heat gains of 15.5% compared to the configuration ＂breeze block-coating mortar and roof not insulated＂.
文摘基于Li Fa Ming的平行棒模型,对短钢纤维增强砂浆的平板试件,在直接拉伸条件下的破坏行为进行了分析,假设试件由N根相互平行的复合棒组成,每根复合棒又由一根纤维棒和S根砂浆棒组成,考虑纤维在基体中分布的方向因子和长度因子,砂浆的损伤可按连续损伤力学进行处理,将Loland模型和Mazars模型加以改进来描述。依据多根纤维的拉拔模型,假定纤维与基体间界面的损伤由纤维脱粘长度与纤维插入长度的比值来描述,复合材料的损伤包括基体的损伤和纤维的损伤,借助已有的试验数据和文献资料来确定本构模型中的各种参数,成功建立了短钢纤维增强砂浆直接拉伸应力-应变全曲线模型。所建模型与试件在直接拉伸试验下的应力-应变全曲线进行了对比,结果较为吻合。
