Cement-modified gold tailings and its performance in the base layer of roads
SUN Xingchen
WANG Kun
LI Qiangfei
XIE Dandan
JIANG Ziyu
Abstract：To assess the feasibility of using gold tailings on a large scale as a subbase material for road subgrades,cement is mixed with gold tailings at different mass ratios w(0％,3％,5％,7％)to prepare specimens of gold tailings.The specimens undergo direct shear tests,consolidation tests,California bearing ratio(CBR)tests,and freeze-thaw cycling tests to evaluate the feasibility of gold tailings as a base material for roads.The results indicate:1)The normal stress and shear strength of cement-modified gold tailings samples are linearly related.At the same w,the shear strength of the cement-modified gold tailings specimens increases linearly with the increase of normal stress;under the same normal stress,the shear strength of the cement-modified gold tailings specimens initially increases and then decreases with the increase of w;the specimen with w=5％exhibits the highest shear strength.2)At the same w,the deformation of the cement-modified gold tailings specimens gradually increases with the extension of consolidation time;with the same consolidation time,the deformation of the cement-modified gold tailings specimens initially decreases and then increases with the increase of w.The deformation of the specimen made with w=5％cement-modified gold tailings is the smallest.3)At the same compaction degree,the California bearing ratio of the cement-modified gold tailings specimens increases initially and then decreases with the increase of w;at the same w,the California bearing ratio of the cement-modified gold tailings specimens increases with the increase of compaction degree;the maximum California bearing ratio is observed at w=5％and a compaction degree of 95％.4)In the freezing and thawing test,the compressive strength and tensile strength of cement-modified gold tailings specimens first increase and then decrease with the increase of w;under sulfate freeze-thaw conditions,the compressive strength of gold tailings specimens without cement addition and those with 5％cement-modified gold tailings decreases with the increase of freeze-thaw cycle times,while the latter shows a significantly reduced decline;increasing the sulfate mass fraction exacerbated the erosion of the cement-modified gold tailings specimens,reducing their compressive strength.The cement-modified gold tailings with w=5％can significantly improve compressive strength,tensile strength,deformation resistance,and durability,meeting the technical requirements for use as road base materials.
Keywords：gold tailingssubbasedirect shear testconsolidation testCBR testcement
Publication Date：2025-09-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 83-89 )