纳米二氧化硅对水硬性石灰胶凝性能的影响

doi:10.19964/j.issn.1006-4990.2022-0552

Abstract

Abstract:

Natural hydraulic lime（NHL） is an inorganic adhesive material with both hydraulic and pneumatic，which is mainly used as binder for ancient building reinforcement and mural restoration.Low-grade NHL has problems such as cracking，poor water resistance，and Ca（OH）₂leaching because of its relatively slow hydration or reaction rate.The effect of the gas phase nano SiO₂（powder） on the physical properties and microscopic internal structure of the hydraulic lime was studied.Based on the characteristics of natural hydrated lime and nano SiO₂，adding nano SiO₂ to natural hydrated lime could improve the activity of NHL to increase the content of hydrated calcium silicate in gel materials without changing the original color of lime.The experimental studies showed that the addition of nano SiO₂ could increase the grade of NHL2 to NHL3.5 or even NHL5.Microanalysis of samples was conducted by using XRD，XRF，FT-IR，and SEM in the overall reaction.It was found that a large amount of calcium silicate gel material was generated in the natural hydraulic lime gel materials，which made the specimen structure compact，revealing the reason for the improvement of mechanical properties of natural hydraulic lime materials.

Key words: nano SiO₂, hydraulic lime, microscopic characterization, mechanical properties

CLC Number:

TQ127.2

WANG Yue, FANG Guoxiang, ZHANG Daoming, WANG Weicheng. Effect of nanosilica on gelling properties of hydraulic lime[J]. Inorganic Chemicals Industry, 2023, 55(7): 75-80.

Figures/Tables 13

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编号	w（NHL）/%	w（NS）/%
NS0	100	0
NS1	97	3
NS2	94	6
NS3	91	9

样品	养护龄期/d	w（CaO）/%	w（SiO₂）/%	n（Ca）/n（Si）
NHL2	0	76.0	9.57	8.51
NS0	7	73.0	12.6	6.21
NS0	28	70.8	13.1	5.79
NS1	7	68.7	17.3	4.25
NS1	28	66.7	17.8	4.01
NS3	7	62.2	25.3	2.63
NS3	28	54.9	32.4	1.82

衍射峰值/cm^-1	键型	成分
3 644	—OH	Ca（OH）₂
1 429、874、712	C—O	CaCO₃
516	Si—O	C₂S
968	Si—O—Si	C-S-H

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Effect of nanosilica on gelling properties of hydraulic lime

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