Water absorption behavior of hydrophobized concrete using silane emulsion as admixture

IF 12.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Central Science Pub Date : 2022-04-01 DOI:10.1016/j.cemconres.2022.106738

Chaoyang Zhang, Shangfeng Zhang, Jianwei Yu, Xiangming Kong

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引用次数: 22

Abstract

Influences of silane emulsion as hydrophobic agent on pore structure of hardened cement paste (hcp), compressive strength and water absorption behavior of concrete were studied through pore structure analysis, water contact angle test and water/isopropanol absorption measurement. Results indicate that silane slightly inhibits early cement hydration and slightly reduces the 28-d compressive strength of concretes. The incorporation of silane significantly decreases the water sorptivity of concretes ascribed to the hydrophobization of capillary walls in hcps, whereas isopropanol absorption is not visibly affected by the addition of silane. The absolute water sorptivity decreases along with increasing water absorption amount for each group of concrete, which is believed to originate from swelling of C-S-H gel upon water absorption. However, the relative water sorptivity of the silane-modified concretes to the plain concrete remains constant during water absorption. A predicting method for long-term water absorption behavior of the silane-modified concrete is proposed.

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硅烷乳液掺合料对疏水混凝土吸水性能的影响

通过孔隙结构分析、水接触角测试和水/异丙醇吸收量测试，研究了硅烷乳液作为疏水剂对硬化水泥浆体(hcp)孔隙结构、混凝土抗压强度和吸水性能的影响。结果表明:硅烷对水泥早期水化有轻微抑制作用，对混凝土28 d抗压强度有轻微降低作用;硅烷的掺入显著降低了混凝土的吸水率，这是由于hcps中毛细血管壁的疏水作用，而异丙醇的吸收不受硅烷掺入的明显影响。各组混凝土的绝对吸水率随吸水量的增加而减小，认为这是由于C-S-H凝胶吸水后膨胀所致。然而，硅烷改性混凝土在吸水过程中对素混凝土的相对吸水率保持不变。提出了一种硅烷改性混凝土长期吸水性能的预测方法。

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来源期刊

ACS Central Science Chemical Engineering-General Chemical Engineering

CiteScore

25.50

自引率

0.50%

发文量

194

审稿时长

10 weeks

期刊介绍： ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.