Characterization of the Influence of an Accelerator upon the Porosity and Strength of Cement Paste by Nuclear Magnetic Resonance (NMR) Relaxometry

被引：6

作者：

Rusu, Mihai M. ^{[1
]}

Vilau, Cristian ^{[2
]}

Dudescu, Cristian ^{[2
]}

Pascuta, Petru ^{[1
]}

Popa, Florin ^{[3
]}

Ardelean, Ioan ^{[1
]}

机构：

[1] Tech Univ Cluj Napoca, Dept Phys & Chem, Cluj Napoca 400114, Romania

[2] Tech Univ Cluj Napoca, Dept Mech Engn, Cluj Napoca, Romania

[3] Tech Univ Cluj Napoca, Dept Mat Sci & Engn, Cluj Napoca, Romania

来源：

ANALYTICAL LETTERS | 2023年 / 56卷 / 02期

关键词：

Accelerator; cement composite hydration; compressive strength; nuclear magnetic resonance relaxometry; pore distribution; PORTLAND-CEMENT; CAPILLARY PORES; EARLY HYDRATION; GRAY CEMENT; RELAXATION; TEMPERATURE; CONCRETE;

D O I：

10.1080/00032719.2022.2072855

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Designing of new cement-based materials, suitable for three-dimensional printing applications, requires accurate control of the porosity and strength development. This goal may be achieved by introducing the so-called accelerators in the cement mixture. One such accelerator, used in many commercial products, is calcium nitrate. In the present work, the effect of calcium nitrate on the kinetics of pore evolution and strength development was investigated using low-field nuclear magnetic resonance relaxometry and compressive tests. The presence of calcium nitrate in cement paste accelerates the hydration dynamics immediately after mixing but does not significantly affect the pore structure. Moreover, the presence of calcium nitrate increases the compressive strength at 7 days compared with the simple cement paste but the same compressive strength was reached following 28 days of hydration.

引用

页码：303 / 311

页数：9

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