【摘要】：以摻鋼渣土為主要研究對象,采用"透水石上吸水-自然風干"方法模擬路床材料的干濕循環(huán)狀態(tài),研究了摻鋼渣土強度的干濕循環(huán)劣化性能,從強度破壞模式與微觀機理分析石灰對鋼渣活性激發(fā)的影響。結果表明:隨著干濕循環(huán)次數(shù)的增加,試件含水率呈增大趨勢并趨于穩(wěn)定,變化幅度在3%以內。摻鋼渣土無側限抗壓強度與劈裂強度的干濕循環(huán)劣化效果明顯,其中石灰土的衰減幅度最大,分別為59.5%與55.3%,石灰鋼渣土最小。劈裂抗拉強度與無側限抗壓強度比值結果發(fā)現(xiàn),石灰土與石灰鋼渣土隨干濕循環(huán)次數(shù)變化,該比值f_t/f_(cu)基本穩(wěn)定,在12.3~19.4之間,但鋼渣土f_t/f_(cu)均小于12.8;鋼渣土劈裂抗拉強度衰減幅度顯著高于無側限抗壓強度,劈裂抗拉強度更能反映鋼渣土的干濕循環(huán)劣化性能。干濕循環(huán)后摻鋼渣土試件抗壓強度與試件核心區(qū)的干濕循環(huán)劣化程度密切相關,而劈裂強度則更多的反映試件外圍部分的強度特征。對比鋼渣土與石灰鋼渣土強度形成機理,驗證鋼渣在堿性環(huán)境中更易形成強度大的沸石類礦物。在工程應用中,建議摻入適量石灰。
[Abstract]:Taking steel-doped residue as the main research object, the dry and wet cycle state of the road bed material was simulated by the method of "absorbing-natural air drying on permeable stone", and the dry and wet cycle deterioration performance of the strength of the steel-doped residual soil was studied. The influence of lime on the activation of steel slag was analyzed from the strength failure mode and microscopic mechanism. The results showed that the moisture content of the specimens increased with the increase of the times of dry and wet cycles and tended to be stable, and the range of change was less than 3%. The effect of dry and wet cycle degradation of unconfined compressive strength and splitting strength of steel-doped residual soil is obvious, among which the attenuation range of lime soil is the largest, which is 59.5% and 55.3%, respectively, and the lime steel residue is the smallest. The ratio of splitting tensile strength to unconfined compressive strength shows that the ratio of lime soil to lime steel residue varies with the times of dry and wet cycles, and the ratio of f T / f _ (cu) is basically stable, ranging from 12.3 to 19.4. However, flife / f _ (cu) of steel residue is less than 12.8.The attenuation range of splitting tensile strength of steel residue is significantly higher than that of unconfined compressive strength, and the splitting tensile strength can better reflect the dry and wet cycle deterioration of steel slag soil. The compressive strength of the specimens doped with steel residue after dry and wet cycling is closely related to the dry and wet cycle deterioration of the core of the specimens, while the splitting strength reflects the strength characteristics of the peripheral parts of the specimens. Comparing the strength formation mechanism between steel residue and lime steel residue, it is proved that steel slag is more likely to form zeolite minerals with high strength in alkaline environment. In engineering application, it is suggested that appropriate amount of lime be added.
【作者單位】： 中原工學院建筑工程學院;鄭州大學水利與環(huán)境學院;
【基金】：國家自然科學基金青年基金,項目編號51509274 河南省高等學校重點科研項目,項目編號15A560013
【分類號】：U414

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