Effects of Nano-SiO2 Doping on Frost Resistance of Hydraulic Concrete

doi:10.19894/j.issn.1000-0518.250111

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (12): 1671-1678.DOI: 10.19894/j.issn.1000-0518.250111

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Effects of Nano-SiO₂ Doping on Frost Resistance of Hydraulic Concrete

Jin YANG(), Chang-Yi CAO, Hui-Jian CHEN

China Construction Communications Construction Group Co. ，Ltd. ，Beijing 100071，China

Received:2025-03-27 Accepted:2025-07-18 Published:2025-12-01 Online:2025-12-30
Contact: Jin YANG

Abstract

Abstract:

To study the effect of new admixtures on the frost resistance of hydraulic concrete and improve its frost resistance and durability in extreme environments， this article adopts research methods such as literature review， experimental research， and numerical analysis to study the effects of different dosages of nano silica on the air content， slump， mechanical properties， and frost resistance of hydraulic concrete. The research results indicate that the optimal mass percent of nano silica in the experiment are 1.0% and 1.2%； The addition of nano silica can reduce the air content and slump of hydraulic concrete； According to the compressive strength test， the addition of nano silica can enhance the compressive strength of hydraulic concrete； According to the frost resistance test， the addition of nano silica can reduce the relative dynamic elastic modulus.

Key words: Nano-materials, Concrete, Air content, Compressive strength, Frost resistance

CLC Number:

O613

Jin YANG, Chang-Yi CAO, Hui-Jian CHEN. Effects of Nano-SiO₂ Doping on Frost Resistance of Hydraulic Concrete[J]. Chinese Journal of Applied Chemistry, 2025, 42(12): 1671-1678.

Figures/Tables 12

Table 1 Expansion coefficient experimental mix ratio

Sample	w（Nano-SiO₂）/%	m（Nano-SiO₂）/g	m（H₂O）/g	m（tatol）/g
N	0.0	0.0	200.0	200.0
NS-0.6	0.6	1.2	198.8	200.0
NS-0.8	0.8	1.6	198.4	200.0
NS-1.0	1.0	2.0	198.0	200.0
NS-1.2	1.2	2.4	197.6	200.0

Fig.1 Schematic diagram of slump test

Fig.2 Schematic diagram of gas content experiment

Fig.3 The first expansion test results of specimens with different mass percent of Nano-SiO2

Fig.4 The second expansion test results of specimens with different mass percent of Nano-SiO2

Fig.5 Third expansion test results of specimens with different mass percent of silicon dioxide

Table 2 Experimental results of gas content and slump of specimens with different mass percent of Nano-SiO2

Sample	Gas content （target within 2.5%）	Slump （target （80±10） mm）
N	2.1	75
NS-1.0	0.9	40
NS-1.2	2.4	40

Table 3 Experimental results of compressive strength of specimens with different mass percent of Nano-SiO2

Sample	Compressive strength of concrete（7 d）/MPa	Compressive strength of concrete（28 d）/MPa
N	28.0	39.0
NS-1.0	29.2	41.8
NS-1.2	27.2	40.9

Table 4 Mass loss rate of specimens with different mass percent of Nano-SiO2 under different freeze-thaw cycles

Sample	75	100	125
N	0	0.42	1.36
NS-1.0	0	0.56	1.54
NS-1.2	0.10	0.37	1.20

Table 5 Relative dynamic elastic modulus of specimens with different silicon dioxide content under different freeze-thaw cycles

Sample	0	25	50	75	100	125
N	100	87.84	77.65	77.48	76.72	76.27
NS-1.0	100	87.92	77.15	76.98	75.79	75.39
NS-1.2	100	83.22	75.11	75.55	74.33	74.05

Fig.6 Mass loss rate of specimens with different mass percent of Nano-SiO2 under different freeze-thaw cycles

Fig.7 Relative dynamic elastic modulus of specimens with different mass percent of Nano-SiO2 under different freeze-thaw cycles

References 14

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Effects of Nano-SiO₂ Doping on Frost Resistance of Hydraulic Concrete

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