吕晨炜, 伍浩良, 石名磊. 2019: 水泥固化稳定珊瑚礁岩、砂吹填材料路用性能研究. 工程地质学报, 27(6): 1440-1447. DOI: 10.13544/j.cnki.jeg.2019-096
    引用本文: 吕晨炜, 伍浩良, 石名磊. 2019: 水泥固化稳定珊瑚礁岩、砂吹填材料路用性能研究. 工程地质学报, 27(6): 1440-1447. DOI: 10.13544/j.cnki.jeg.2019-096
    LÜ Chenwei, WU Haoliang, SHI Minglei. 2019: LABORATORY TESTS OF CEMENT STABILIZED & SOLIDIFIED CORAL REEF AND SAND FOR USE OF HIGHWAY PAVEMENT. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1440-1447. DOI: 10.13544/j.cnki.jeg.2019-096
    Citation: LÜ Chenwei, WU Haoliang, SHI Minglei. 2019: LABORATORY TESTS OF CEMENT STABILIZED & SOLIDIFIED CORAL REEF AND SAND FOR USE OF HIGHWAY PAVEMENT. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1440-1447. DOI: 10.13544/j.cnki.jeg.2019-096

    水泥固化稳定珊瑚礁岩、砂吹填材料路用性能研究

    LABORATORY TESTS OF CEMENT STABILIZED & SOLIDIFIED CORAL REEF AND SAND FOR USE OF HIGHWAY PAVEMENT

    • 摘要: 为实现岛礁公路建设资源集约化,提出采用水泥固化稳定珊瑚礁岩、砂作为路面基层材料。通过无侧限抗压强度、劈裂强度、回弹模量、水稳性、干缩和温缩试验,探究水泥固化稳定珊瑚礁岩、砂吹填材料强度、刚度、水稳性和收缩性等路用性能,为后续岛礁工程建设提供理论依据和数据支持。结果表明:在标养条件下,相同龄期的试样抗压强度和劈裂强度随水泥用量增加而提高,水泥用量相同的试样随龄期增长而提高;抗压强度增长基本符合线性规律。回弹模量随水泥用量增加而提高,但增幅逐渐减小。相同龄期下,试件饱和抗压强度相对于低于标准抗压强度;水泥用量和龄期越大,强度损失率越小,抗软化能力越强,如水泥用量6%试样28 d强度损失率与软化系数是水泥用量3%的93%和101%。试样失水率与干缩应变随龄期与水泥用量增加而增长,如水泥用量6%试样180 d失水率和干缩应变是水泥用量3%的1.35倍和1.27倍。温缩试验表明:温缩应变和温缩系数随水泥用量增加而增大,而随温度降低先增大后减小,处于30~45℃温度区间是岛礁公路建设最不利的状态,应尽量避免高温施工。

       

      Abstract: In order to resolve the issue of intensive resource during the reef highway construction, it is proposed to using cement stabilized/solidified coral reef and sand as pavement base materials. The experiments are carried out for their unconfined compressive strength, splitting strength, modulus of resilience, water stability, dry shrinkage and temperature shrinkage and examine their strength, stiffness, water stability and shrinkage characteristics. This research would provide theoretical basis and data foundation for the subsequent construction of reef engineering. The results show that under the standard curing conditions, compressive strength and splitting strength increase with the increase of cement dosage at the same curing age, and those strengths were also improved along with the age growth under the same cement dosage. The compressive strength follows an approximate liner relationship with the cement dosage. Modulus of resilience increases with the rising cement dosage, while the growth rate gradually decreases. Under the same age, saturation strength of the sample is relatively lower than the standard strength. The higher dosage of cement and the longer curing age induce lower intensity loss rate and higher performance of softening resisting. After 28 day curing, the strength loss rate increases 93% and the softening coefficient increases 101%, respectively, as the cement dosage decrease from 6% to 3%. For the dry shrinkage test, the water loss rate and dry shrinkage strain increase with rising the age and cement dosage. After 180 day curing, water loss rate and the drying shrinkage strain decrease 1.35 times and 1.27 times, respectively, as the cement dosage increase from 3% to 6%. The temperature shrinkage tests show that shrinkage strain and coefficient increase with rising cement dosage, whereas they fluctuate along the temperature drop. The temperature range of 30~45℃ is the most disadvantage reef construction of highway pavement, so high temperature construction needs to be avoid.

       

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