当前位置: X-MOL 学术Arch. Civ. Mech. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experimental investigation on the influence of phase change materials on properties and pore structure of steam-cured mortar
Archives of Civil and Mechanical Engineering ( IF 4.4 ) Pub Date : 2021-01-12 , DOI: 10.1007/s43452-020-00170-7
Liping Bi , Guangcheng Long , Cong Ma , Youjun Xie

Steam-cured concrete with high early strength has been widely applied in high-speed railway. However, heat damage caused by the steam curing process brings adverse effects on the pore structure and durability of steam-cured concrete. It has been found that phase change materials (PCMs) help improve the durability of cement-based materials. Therefore, the influences of two PCMs on the strength, water absorption, and microstructure of steam-cured mortar are discussed in this study. Two PCMs used include pure paraffin and a composite phase change material composed of porous diatomite and paraffin (D/P). The results show that the addition of appropriate PCMs does not significantly reduce the strength of steam-cured mortar. The addition of a small amount of PCMs shows little influence on the pore structure of steam-cured mortar but effective in improving the water-penetration resistance. This is partially attributed to the improvement of hydrophobic characteristics in the pores, resulting from the adhesion of hydrophobic PCMs on the pores during the steam curing. Compared with specimens containing pure paraffin, the pore structure of specimens containing D/P is refined, resulting in higher compressive strength. This may be due to the uniform distribution of small particles D/P in the specimen and the pozzolanic reaction of diatomite in D/P. The use of suitable phase change materials will be helpful to improve the durability of steam-cured concrete.



中文翻译:

相变材料对蒸熟砂浆性能和孔隙结构影响的实验研究

早期强度高的蒸汽养护混凝土已在高速铁路中得到广泛应用。然而,由蒸汽养护过程引起的热损伤对蒸汽养护的混凝土的孔结构和耐久性产生不利影响。已经发现,相变材料(PCM)有助于改善水泥基材料的耐久性。因此,本研究讨论了两种PCM对蒸汽固化砂浆的强度,吸水率和微观结构的影响。使用的两种PCM包括纯石蜡和由多孔硅藻土和石蜡(D / P)组成的复合相变材料。结果表明,添加适当的PCM不会显着降低蒸汽固化砂浆的强度。少量PCM的添加对蒸汽固化的砂浆的孔结构几乎没有影响,但是对改善耐水渗透性有效。这部分归因于在蒸汽固化期间由于疏水性PCM在孔上的粘附而导致的孔中疏水特性的改善。与包含纯石蜡的标本相比,包含D / P的标本的孔结构更加精细,从而具有更高的抗压强度。这可能是由于小颗粒D / P在样品中的均匀分布以及硅藻土在D / P中的火山灰反应所致。使用合适的相变材料将有助于改善蒸汽固化混凝土的耐久性。这部分归因于在蒸汽固化期间由于疏水性PCM在孔上的粘附而导致的孔中疏水特性的改善。与包含纯石蜡的标本相比,包含D / P的标本的孔结构更加精细,从而具有更高的抗压强度。这可能是由于小颗粒D / P在样品中的均匀分布以及硅藻土在D / P中的火山灰反应所致。使用合适的相变材料将有助于改善蒸汽固化混凝土的耐久性。这部分归因于在蒸汽固化期间由于疏水性PCM在孔上的粘附而导致的孔中疏水特性的改善。与包含纯石蜡的标本相比,包含D / P的标本的孔结构更加精细,从而具有更高的抗压强度。这可能是由于小颗粒D / P在样品中的均匀分布以及硅藻土在D / P中的火山灰反应所致。使用合适的相变材料将有助于改善蒸汽固化混凝土的耐久性。这可能是由于小颗粒D / P在样品中的均匀分布以及硅藻土在D / P中的火山灰反应所致。使用合适的相变材料将有助于改善蒸汽固化混凝土的耐久性。这可能是由于小颗粒D / P在样品中的均匀分布以及硅藻土在D / P中的火山灰反应所致。使用合适的相变材料将有助于改善蒸汽固化混凝土的耐久性。

更新日期:2021-01-12
down
wechat
bug