Suspended hydration and loss of freezable water in cement pastes exposed to 90% relative humidity
Suspended hydration and loss of freezable water in cement pastes exposed to 90% relative humidity
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DOI：
10.1016/j.cemconres.2004.03.007
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发表时间：
2004-11
影响因子：
11.4
通讯作者：
Kenneth A. Snyder;D. Bentz
中科院分区：
文献类型：
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作者：
Kenneth A. Snyder;D. Bentz
水化度（DOH）和差示扫描量热法（DSC）测量用于表征早期暴露于90%相对湿度（RH）环境对水泥浆水化的影响。早期暴露于90%RH环境可能导致可冻结水的消耗和微观结构发育的改变。消除不饱和环境对微观结构发展的影响所需的100%RH固化的最短持续时间与所研究的糊剂在−30 °C附近出现的DSC峰在1-14天范围内一致。詹宁斯胶体微观结构模型被用来论证−30 °C的峰值与毛细孔渗透的停止相一致。或者，在90%RH暴露之前，所有样品在100%RH条件下固化7天，以与连续暴露于100%RH的那些相同的速率水合。这些结果的应用，以制定单独的固化实践的耐久性和强度进行了讨论。
Degree of hydration (DOH) and differential scanning calorimetry (DSC) measurements are used to characterize the effect of early exposure to a 90% relative humidity (RH) environment on cement paste hydration. Early exposure to a 90% RH environment can lead to the consumption of freezable water and altered microstructural development. The minimum duration of 100% RH curing required to eliminate the effects of an unsaturated environment on microstructural development coincides with the appearance of a DSC peak near −30 °C that occurs in the range 1–14 days for the pastes studied. The Jennings colloidal microstructural model is used to argue that the −30 °C peak coincides with the cessation of capillary pore percolation. Alternatively, all samples cured under 100% RH conditions for 7 days prior to 90% RH exposure hydrated at the same rate as those continuously exposed to 100% RH. The application of these results to the formulation of separate curing practices for durability and strength is discussed.