晋阳古城遗址土加固前后热物理参数研究
首发时间:2018-02-08
摘要:利用Hot Disk热常数分析仪器对于晋阳的古城遗址土以及经丙烯酸与石灰加固后的遗址土实施了热物理参数测试,依次明确了加固前后晋阳古城遗址土的它的导热系数以及热扩散系数还有体积比热伴随含水率改变的变化关系。结果表明,随含水率的增加,晋阳古城遗址土导热系数呈对数增长,经丙烯酸加固后的遗址土导热系数呈线性增长,经石灰丙烯酸加固之后的遗址土的导热系数呈对数增长;热扩散系数却都随着含水率的增大先增大后减小,体积比热却随着含水率的提高而提高。结合扫描电镜(SEM)分析结果发现,石灰遇水发生化学反应生成氢氧化钙,而氢氧化钙与丙烯酸反应生成的丙烯酸钙使土颗粒联接在一起,因此土的孔隙减少,而土颗粒联结增强,随着水分进入遗址土中,土颗粒间的联结更强,使加固效果更加显著。
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Research on thermal pararmeters before and after reinforcement of earth monument soils of ancienty city of Jinyang
Abstract:Thermal physical parameters test was performed through Hot Disk thermal constant analyzer on the eartn monument soils of the ancient city of Jinyang and the soil reinforced by acrylic acid and lime. The relationship between thermal conductivity, thermal diffusion coefficient and volume ratio with water content was determined for the earth monument soils of the ancient city of Jinyang before and after the reinforcement. The results showed that with the increment of moisture content, soil thermal conductivity of soils of ancient city of Jinyang increased logarithmically, the thermal conductivity of soils reinforced by acrylic acid increased linearly and thermal conductivity of soils reinforced by acrylic acid and lime increased logarithmically; thermal diffusion coefficient increased first and then decreased with the increment of moisture content, then volume ratio increased with the increment of water content. The scanning electron microscope (SEM) analysis results showed that the chemical reaction between lime and water would form calcium hydroxide, the calcium hydroxide and acrylic acid reacted to produce the calcium acrylate which made the soil particles connect together, so the soil pores decreased, and the soil particle connection was strengthened, with water entering the site soil, stronger connection between soil particles would be formed and the effect of reinforcement became more significant.
Keywords: earth monument thermal parameters moisture content acrylic acid lime
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