Funct. Mater. 2023; 30 (3): 407-412.


Improving the early mechanical properties of a pozzolan-added cement-based material by adding Nano C-S-H

Yihui Zhong1,2, Gang Liao1,2

1PowerChina Chengdu Engineering Corporation Limited, 610072 Chengdu, China
2Technological Innovation Center of Hydropower, Wind, Solar and Energy Storage of Tibet Autonomous Region, 860500 Nyingchi, China


The mechanical properties of the pozzolan-added cement material with the addition of nano C-S-H have been studied. A mechanism that influences on them is proposed. X-ray diffraction (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP) were used to characterize the microstructure of the pozzolanic mortar. The results showed a significant effect of property improvement when using nano-sized C-S-H: the compressive strength increased from 22.3 MPa to 33.2 MPa after 7 days. SEM images showed that after the addition of nanosized C-S-H, the matrix became more compact and the number of defects decreased. X-ray analysis confirmed that the addition of nanosized C-S-H increased the amount of C-S-H formed during hydration. The MIP results showed that nanoscale CSH improves the pore structure of the mortar and significantly reduces the porosity. All microscopic measurements showed that nanosized C-S-H accelerates the process of cement hydration and forms more hydration products, which contributes to the modification of the interfacial transition zone of the solution and increases the compactness of the matrix. This is the main reason for improving the initial mechanical properties of the cement-based pozzolanic mixture.

pozzolan, nanosized C-S-H, early mechanical properties, hydration acceleration.

1. B.Yilmaz, A.Ucar, B.Oteyaka et al., Building and Environment, 42, 3808 (2007).

2. S.Liu, P.Fang, H.Wang et al., Powder Technology, 380, 59 (2021).

3. M.Meziani, N.Leklou, N.Chelouah et al., Construction and Building Materials, 318, 126008 (2022).

4. B.Liguori, F.Iucolano, Gennaro et al., Construction and Building Materials, 99, 272 (2015).

5. A.G.Turkmenoglu, A.Tankut, Cement and Concrete Research, 32, 629 (2002).

6. M.Cherrak, A.Bali, K.Silhadi, Construction and Building Materials, 47, 318 (2013).

7. B.Liguori, F.Iucolano, Gennaro et al., Construction and Building Materials, 99, 272 (2015).

8. W.He, G.Liao, Functional Materials, 28, 737 (2021).

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