【作者】 胡良明；

【导师】 高丹盈；

【作者基本信息】 郑州大学 ， 材料加工工程， 2012， 博士

【摘要】 塑性混凝土是介于普通混凝土与粘土之间的工程复合材料,具有拌和物工作性好、弹性模量低、极限应变大、抗渗性能好、工程造价低等优点,其在防渗工程中的应用越来越广泛,具有很大的发展潜力和应用前景。自从塑性混凝土问世以来,国内外学者针对塑性混凝土的工程应用开展了大量的研究,但理论研究还比较滞后。本文是国家973计划前期研究专项-高性能塑性混凝土材料及其防渗墙结构(2010CB635118)的主要部分。通过塑性混凝土在单轴和定侧压下的三轴试验,重点研究了塑性混凝土的受压性能,建立了相应的数学计算模型,主要内容如下：(1)通过塑性混凝土拌和物工作性试验,研究了水胶比、砂率、水泥用量、粘土用量、膨润土用量和类型对塑性混凝土拌和物密度、泌水率、初凝和终凝时间、坍落度、扩展度的影响,分析了塑性混凝土扩展度与坍落度比值与其工作性的关系,建立了塑性混凝土单位用水量计算方法。(2)通过396个100mm×100mm×100mm和150mm×150mm×150mm塑性混凝土试件的抗压试验、劈拉试验以及90个100mm×100mm×400mm塑性混凝土试件的抗折试验,研究了水胶比、砂率、水泥用量、粘土用量、膨润土用量和类型以及养护龄期(包括超长龄期540d)对塑性混凝土抗压强度、劈拉强度和抗折强度的影响,分析了塑性混凝土的拉压比以及抗压强度、劈拉强度的尺寸效应,提出了塑性混凝土超长龄期强度与各龄期强度之间的关系模型。(3)通过87个150mm×150mm×300mm塑性混凝土棱柱体试件的单向受压试验,系统研究了砂率、水胶比、水泥用量、粘土用量、膨润土用量、砂子类型、膨润土类型、龄期等因素对塑性混凝土弹性模量、峰值应力、峰值应变、能量吸收等受压性能的影响,建立了塑性混凝土单向受压应力应变曲线的弹性模量、峰值应变、反弯点应力应变、收敛点应力应变等特征参数与峰值应力之间的关系模型,提出了单向受压塑性混凝土应力应变本构关系的数学模型。(4)通过36个150mm×150mm×150mm塑性混凝土试件的三轴受压试验,分析了水胶比、砂率、水泥用量、粘土用量、膨润土用量对塑性混凝土三轴受压强度及应力应变本构关系的影响,建立了塑性混凝土三轴受压本构关系数学模型,提出了塑性混凝土八面体应力空间破坏准则的一般方程。更多还原

【Abstract】 Plastic concrete is a composite material lies between normal concrete and clay. With the advantages of nice working performance, low elastic modulus, great deform ability, good permeable performance and low engineering cost, plastic concrete has been widely applied in hydraulic engineering and has great developing potential and application prospect. Wide researches on the engineering application of plastic concrete have been taken since the appearance of plastic concrete, but insufficient in theoretical research.As the main part of the Properties of High-Performance Plastic Concrete Materials and its Cut-off Walls(NO.2010CB635118), this paper is supported by the earlier research project of 973 program. On the basis of the test of plastic concrete under axial and lateral tri-axial compression, the compression behavior of plastic concrete is emphatically studied, and the corresponding calculation models are established. Main research contents are as follows:(1) On the basis of the test of plastic concrete mixture, the influences of water cement ratio, sand ratio, cement content, clay content, bentonite content, type of bentonite on the density, bleeding rate, initial and final setting time, slump, spreading of plastic concrete mixture are studied, the relationship of the ratio of spreading to slump and the working performance of plastic concrete is analyzed, and the The formula of unit water use of plastic concrete is established..(2)On the basis of compression test and splitting tensile test of 396 plastic concrete specimens of 100mm×100mm×100mm and 150mm×150mm×150mm, and the bending test of 90 plastic concrete specimens of 100mm×100mm×400mm, the influences of water cement ratio, sand ratio, cement content, clay content, bentonite content, type of bentonite and curing age (including 540 days long curing age) on the compressive strength, splitting tensile strength and flexural strength of plastic concrete are studied, besides, the size effect of tension-compression ratio and compressive strength, splitting tensile strength of plastic concrete is analyzed, and the matheematical reeation model of compression strength of long curing age and other curing age are put forward.(3)On the basis of uniaxial compressive test of 87 plastic concrete specimens of 150mm×150mm×300mm, the effect of sand ratio, water cement ratio, cement content, clay content, bentonite content, type of sands and bentonite and curving ages on elastic modulus, peak stress, peak strain, energy taken in etc. of plastic concrete under axial compression are systematically studied, the mathematical relation models between elastic modulus,peak strain, stress-strain of contra flexure point, stress and strain of convergent point and peak stress are established, respectively. Then, the strain-stress relationship mathematical model of plastic concrete under axial compression is established.(4) On the basis of test of 36 plastic concrete specimens of 150mm×150mm×150mm under tri-axial compressive load, the influences of sand ratio, water cement ratio, cement content, clay content, bentonite content on tri-axial compressive strength and stress-strain relationship of plastic concrete are comparatively analyzed, and the strain-stress mathematical model of plastic concrete under tri-axial compression is established, besides, the failure criterion equation of octahedral stress space is put forward.更多还原