Research on the Hydration and Mechanical Properties of NAC-Hardened Cement under Various Activation Methods

Zhang, Shiyi; Fan, Yingfang; Shah, Surendra P.

doi:10.3390/inorganics10090124

Cited by 1 publication

(2 citation statements)

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“…It can be seen that the compressive strength of concrete can be improved by adding calcined raw ore, because the calcined NAC has high pozzolanic activity, and the fibrous rod crystal structure of nano-attapulgite clay is also conducive to improving the internal microstructure of concrete and improving the compactness of microstructure. In addition, the influence of NAC on the slump of concrete is reduced by calcination, and the workability of concrete is improved [5,22,23]. The displacement and load are collected during the loading test, and the load-displacement curve is shown in Figure 5.…”

Section: Compressive Strengthmentioning

confidence: 99%

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Study on the Relationship between Chloride Ion Penetration and Resistivity of NAC-Cement Concrete

Liang

Fang

et al. 2022

Buildings

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To explore the effect of nano-attapulgite clay (NAC) on the durability of concrete, two kinds of NAC (calcined raw ore and calcined high viscosity ore: calcination at 650 °C for 2 h) were used to study their effects on the durability of concrete, mainly discussing the changes of chloride ion permeability and the resistivity of concrete with NAC. The effect of NAC on the strength of concrete was analyzed by testing the compressive strength of concrete. The two-electrode method, four-electrode method, and concrete resistivity tester were used to analyze the relationship between the testing method and concrete resistivity, and the effect of NAC on concrete resistivity was analyzed. The influence of NAC on the chloride corrosion resistance of concrete was analyzed by measuring the chloride diffusion coefficient, and the relationship between the chloride diffusion coefficient and resistivity was established. The diffusion process of chloride ions in concrete was analyzed by theoretical derivation and numerical simulation. The results show that: calcining raw ore NAC can improve the compressive strength of concrete, while calcining high-viscosity ore reduces the compressive strength of concrete. At the age of 28 days, the strength of concrete mixed with calcined raw ore is about 7.10% higher than that of ordinary concrete, while the compressive strength of concrete mixed with calcined high-viscosity ore is about 4.32% lower than that of common concrete. The resistivity of concrete mixed with calcined raw ore increases the fastest, and the 56 days age is about 15.8% and 29.6% higher than that of ordinary concrete and calcined high-viscosity ore. There is a good negative correlation between concrete resistivity and chloride diffusion coefficient. At 28 days, the incorporation of calcined raw ore concrete decreased by about 19.9% and 49.4% compared with ordinary concrete and calcined high-viscosity ore, respectively. After 10 years of decline, the chloride ion content is 11.1% and 23.2% lower than that of ordinary concrete and concrete mixed with calcined high viscosity ore.

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Section: Compressive Strengthmentioning

confidence: 99%

“…It is challenging to vibrate and compact under the same vibrating condition. There are many internal initial defects and more harmful pores, which increase the chloride ion permeability channel and reduce the overall resistance to chloride ion permeability [22].…”

Section: Chloride Diffusion Coefficientmentioning

confidence: 99%