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首页> 外文期刊>Applied Magnetic Resonance >Melting behavior of water confined in nanopores of white cement studied by H-1 NMR cryoporometry: Effect of antifreeze additive and temperature
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Melting behavior of water confined in nanopores of white cement studied by H-1 NMR cryoporometry: Effect of antifreeze additive and temperature

机译：H-1 NMR低温法研究白水泥纳米孔中水的熔融行为：抗冻剂和温度的影响

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摘要

The size and distribution of pores have been studied through the melting behavior of water confined in white cement samples by H-1 nuclear magnetic resonance cryoporometry. It is found that the sample cured at 298 K shows a considerably coarser pore structure in the range of pores from 1 to 15 nm when compared with the samples cured at 278 K. With the addition of the Sika Rapid 2 antifreeze admixture in the cement cured at 278 K, an increase of pores between 5 and 15 run and a more homogeneous distribution of small pores from 1 to 5 nm is observed when compared with cement cured at the same temperature but without the antifreeze additive. The positive influence of Sika Rapid 2 antifreeze admixture on the mechanical properties of cement cured at a lower temperature was also found through the compressive strength measurements performed for the studied cement samples as a function of the curing age.
机译：通过H-1核磁共振冷冻比色法，通过限制白水泥样品中水的熔融行为，研究了孔的大小和分布。发现与在278 K下固化的样品相比，在298 K下固化的样品在1至15 nm的孔范围内显示出相当粗糙的孔结构。在固化的水泥中添加Sika Rapid 2防冻剂与在相同温度下但未添加抗冻剂的水泥相比，在278 K下，观察到的孔隙增加了5至15纳米，小孔隙分布更均匀，从1至5 nm。通过对所研究的水泥样品进行抗压强度测量（随固化年龄的变化），还发现了Sika Rapid 2防冻剂对在较低温度下固化的水泥的机械​​性能的积极影响。

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