Effect of nano-silica on mechanical properties and microstructure of high-volume ground granulated blast furnace slag cement paste

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-07-11 DOI:10.1007/s10971-024-06459-w

Qinqiang Wang, Kangbing Ma, Tao Liu

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Abstract

Incorporating ground granulated blast furnace slag (GBS) as a supplementary cementitious material in cementitious materials can reduce the cement content and improve the performance of cement-based materials. However, adding GBS especially in large quantities, tends to decrease the early-age performance of cement-based materials, such as reducing early strength, increasing porosity, etc. This study introduced nanosilica (NS) into cementitious materials with a high volume GBS to address the deficiencies in early-age performance. This study aims to investigate and discuss the influence of NS on the mechanical properties and microstructure of cementitious materials with a high-volume GBS. The compressive strength, composition of hydration products, distribution of pores, composition of pore structure and microscopic morphology were tested and analyzed. Results showed a significant strength reduction in high-volume GBS (60 wt% GBS) cement paste when compared with pure cement paste samples. NS demonstrated a remarkable enhancement in the strength of high-volume GBS-contained samples in 3 and 7 days. The positive impact of NS on the strength of high-volume GBS-contained samples remained evident at 28 days of age. NS facilitated the hydration of C₃S and C₂S in high-volume GBS-contained samples. The enhancement in the hydration percentage of C₂S was particularly pronounced. In the high-volume GBS-containing cementitious materials, NS continued to consume CH and participate in pozzolanic reactions at a later age. NS decreased the pore volume in the ranges of >100 μm and 100 nm–1 μm in high-volume GBS-contained samples, reduced the quantity of unhydrated GBS and resulted in a more compact structure. The enhancement of strength and the promotion of C₃S and C₂S hydration in increased with the higher addition of NS at 1 wt% and 2 wt%. However, this enhancement and promotion effect diminished when the NS dosage increased to 3 wt%.

Graphical Abstract

Cumulative pore volume of cement paste samples at curing age of (a) 7 days and (b) 28 days.

Abstract Image

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纳米二氧化硅对高炉矿渣水泥浆力学性能和微观结构的影响

在水泥基材料中掺入磨细高炉矿渣（GBS）作为胶凝补充材料，可以降低水泥含量，改善水泥基材料的性能。然而，添加 GBS（尤其是大量添加）往往会降低水泥基材料的早期龄期性能，如降低早期强度、增加孔隙率等。本研究将纳米二氧化硅（NS）引入含有大量 GBS 的水泥基材料中，以解决早期龄期性能的不足。本研究旨在研究和讨论 NS 对高体积 GBS 水泥基材料的力学性能和微观结构的影响。测试和分析了抗压强度、水化产物组成、孔隙分布、孔隙结构组成和微观形态。结果表明，与纯水泥浆样品相比，高体积 GBS（60 wt% GBS）水泥浆的强度明显降低。含有 NS 的高体积 GBS 样品在 3 天和 7 天内的强度明显提高。在 28 天的龄期内，NS 对含高体积 GBS 样品强度的积极影响依然明显。NS 促进了高容量含 GBS 样品中 C3S 和 C2S 的水化。C2S 水合比例的提高尤为明显。在含高容量 GBS 的胶凝材料中，NS 在后期继续消耗 CH 并参与水胶凝反应。在含高体积 GBS 的样品中，NS 在 100 μm 和 100 nm-1 μm 范围内减少了孔隙体积，减少了未水化 GBS 的数量，使结构更加密实。随着 NS 添加量（1 wt% 和 2 wt%）的增加，强度的提高以及对 C3S 和 C2S 水合的促进作用也随之增加。然而，当 NS 用量增加到 3 wt% 时，这种增强和促进作用减弱。

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.