Carbonation curing and long-term shrinkage performance of manufactured sand concrete with different strength grades from tunnel muck

被引：0

作者：

Liu, Chuanbei ^{[1
]}

Liu, Pengfei ^{[1
]}

Tang, Kaijing ^{[2
]}

Guan, Sumin ^{[3
]}

Luo, Xu ^{[1
]}

Zhang, Lihua ^{[1
]}

Liu, Laibao ^{[1
]}

机构：

[1] Southwest Univ Sci & Technol, Sch Mat & Chem, Mianyang 621010, Peoples R China

[2] Mianyang Polytech, Sch Mat & Construct, Mianyang 621000, Peoples R China

[3] Sichuan Huashi Green Homeland Bldg Mat Co Ltd, Chengdu 610095, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2025年 / 467卷

关键词：

Tunnel muck; Manufactured sand; Carbon sequestration capacity; Compressive strength; Shrinkage performance; CEMENT PASTES; CO2; MICROSTRUCTURE; DURABILITY; CHALLENGES;

D O I：

10.1016/j.conbuildmat.2025.140406

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Using tunnel muck to produce manufactured sand is an optimal approach for its resource utilization. However, manufactured sand has characteristics such as angular particles, poor gradation, and high stone powder content, which lead to high cement demand and an increased risk of shrinkage cracking in concrete. This study examined the effects of different mix proportions and carbonation curing processes on the carbon sequestration capacity, compressive strength, and long-term shrinkage performance of tunnel muck manufactured sand mortar. The results showed that as the strength grade of the manufactured sand mortar decreased and the residual water- cement (W/C) ratio reduced, the carbonation depth and degree increased. Carbonation curing increased the compressive strength of low-strength manufactured sand mortar but decreased that of high-strength mortar. The calcium carbonate (CaCO3) crystals produced during carbonation filled the transition pores (10 nm-100 nm) and large capillary pores (100 nm-1 mu m), thereby reducing the drying shrinkage of the samples. However, carbonation curing hindered subsequent clinker hydration and the pore-filling effect of hydration products, resulting in the formation of characteristic bubble pores (1 mu m-10 mu m), which primarily caused the strength reduction. This study provides fundamental data to support carbon sequestration, performance enhancement, and engineering applications of tunnel muck manufactured sand concrete.

引用

页数：11

共 44 条

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