组合基层结构的填缝砂浆配合比设计及性能研究
发布时间：2018-09-17 06:37
【摘要】：组合基层结构是一种新出现的道路基层结构,该结构可以用基块进行组装,且基块可预先在工厂加工完,这样不仅可以确保生产质量,还可以加快铺筑速度。由于传统道路基层结构二灰碎石或水泥混凝土其硬化周期为28天,这样就必然导致面层施工时段延后。组合基层结构具有建设周期短、铺筑速度快、整体性能好的优点,现已初步应用于城市道路抢修与维护中来取代传统二灰碎石基层。填缝砂浆是组合基层结构的重要组成部分,采用此材料对组合基层结构的基块连接处进行灌浆填充,可以使组合基层形成一个整体承载结构。填缝材料可传递基块间的嵌挤作用,协调基块间的变形,其力学及耐久性能将直接影响到整体结构的安全。但由于结构形式较为新颖,目前市面上还没有此类专用砂浆,国内对此用途的填缝砂浆性能研究还存在空白。同时,市场上现有的填缝材料多用于路面修补,价格较高,且耐久性能不足,不能很好的与此结构的性能要求相适应,而这将阻碍组合基层结构在国内的应用与推广。基于以上原因,开展对组合基层结构的填缝砂浆设计及性能研究就显得十分必要。为了得到性能优越的专用填缝砂浆材料,本文在试验基础上,以硫铝酸盐水泥和普通硅酸盐水泥复合作为基本胶凝体系,掺入粉煤灰以形成复合胶凝体系,采用中砂作为集料,掺入适量的缓凝剂、早强剂、减水剂及可分散乳胶粉,配制出具有自流平效果、快硬早强、施工性好、力学性能满足要求。其工艺性能和力学性能均较理想,弹性模量低、抗渗水、抗干缩、抗冻性能好,其流动度较高,且30min内流动度损失较小,这给现场灌缝施工的留下了足够的时间;1d抗折强度达到1.0MPa以上,1d抗压强度达到5MPa以上,满足了基层快速修筑、尽快开放交通的要求,达到了预期的效果。砂浆研制过程中,主要完成了以下研究工作:1、基于砌筑砂浆规范,建立组合基层填缝砂浆的配合比设计思路,并配制出具有早强、自流平效果的填缝砂浆,且价格较市面上的高性能灌浆料明显降低。2、取市面上购置的灌浆料作为对比组,对自制砂浆的抗折强度、抗压强度、劈裂抗拉强度、静力受压弹性模量进行测试,其结果表明,自制砂浆的静力受压弹性模量低于灌浆料,有利于组合基层的接缝结构受力。自制砂浆的抗折强度、抗压强度、劈裂抗拉强度均能满足组合基层结构对填缝材料的要求,适用于组合基层的接缝中。3、取自制填缝砂浆及灌浆料进行耐久性能几疲劳性能试验对比,其结果表明,自制砂浆的抗渗等级略高于灌浆料,而抗冻等级远高于灌浆料,十分适用于东北地区的气候条件。自制砂浆的收缩率、抗疲劳变形能力均能满足组合基层结构对填缝材料的要求。4、将具有自流平效果的掺胶粉砂浆作为填缝材料应用于长春市飞跃中路辅路所铺设试验段的实际工程中,对材料的经济优越性进行计算,并对试验段进行钻芯取样,验证此结构在工程实际中的可行性。
[Abstract]:Composite base structure is a new kind of road base structure, which can be assembled by base blocks and can be processed in factory beforehand. This can not only ensure the quality of production, but also speed up the paving speed. The composite base structure has the advantages of short construction period, fast paving speed and good overall performance, and has been preliminarily applied in urban road emergency repair and maintenance to replace the traditional lime-flyash macadam base course. The grouting filling at the joint can make the composite base form a whole bearing structure. The joint filling material can transfer the embedding effect between the base blocks and coordinate the deformation between the base blocks. Its mechanical and durability performance will directly affect the safety of the whole structure. At the same time, the existing filling materials on the market are mostly used for pavement repair, the price is high, and the durability is insufficient, which can not meet the performance requirements of this structure well, which will hinder the application and promotion of composite base structure in China. It is necessary to study the design and performance of structural joint-filling mortar. In order to obtain the special joint-filling mortar material with superior performance, on the basis of experiment, this paper takes the composite of sulphoaluminate cement and ordinary portland cement as the basic cementing system, mixes fly ash to form the composite cementing system, uses medium sand as aggregate, and mixes it with proper amount. The retarder, early strength agent, superplasticizer and dispersible latex powder are prepared with self-leveling effect, quick hardening and early strength, good workability, and meets the requirements of mechanical properties. The process performance and mechanical properties are ideal, low modulus of elasticity, impervious water resistance, dry shrinkage resistance, good frost resistance, high fluidity, and less loss of fluidity within 30 minutes, which gives the site irrigation. Joint construction left enough time; 1 D flexural strength to 1.0 MPa, 1 d compressive strength to 5 MPa, to meet the rapid construction of the base, as soon as possible to open traffic requirements, to achieve the desired results. The mix proportion design thought, and prepared with early strength, self-leveling effect of the filling mortar, and the price is significantly lower than the high-performance grouting material on the market. 2. Taking the grouting material purchased on the market as a comparison group, the flexural strength, compressive strength, splitting tensile strength, static compressive modulus of elasticity of the homemade mortar were tested. The flexural strength, compressive strength and splitting tensile strength of the self-made mortar can meet the requirements of the composite base structure for the filling materials. It is suitable for the joint of the composite base. 3. Taking the self-made filling mortar and grouting material for durability. The results of several fatigue tests show that the impermeability grade of the self-made mortar is slightly higher than that of the grouting material, and the frost resistance grade is much higher than that of the grouting material, which is very suitable for the climate conditions in Northeast China. As a filling material, mortar mixed with glue is applied to the practical engineering of the test section of the auxiliary road of Changchun Feiyue Middle Road. The economic superiority of the material is calculated, and the core drilling sampling is carried out to verify the feasibility of the structure in the engineering practice.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U414
本文编号：2245023
[Abstract]:Composite base structure is a new kind of road base structure, which can be assembled by base blocks and can be processed in factory beforehand. This can not only ensure the quality of production, but also speed up the paving speed. The composite base structure has the advantages of short construction period, fast paving speed and good overall performance, and has been preliminarily applied in urban road emergency repair and maintenance to replace the traditional lime-flyash macadam base course. The grouting filling at the joint can make the composite base form a whole bearing structure. The joint filling material can transfer the embedding effect between the base blocks and coordinate the deformation between the base blocks. Its mechanical and durability performance will directly affect the safety of the whole structure. At the same time, the existing filling materials on the market are mostly used for pavement repair, the price is high, and the durability is insufficient, which can not meet the performance requirements of this structure well, which will hinder the application and promotion of composite base structure in China. It is necessary to study the design and performance of structural joint-filling mortar. In order to obtain the special joint-filling mortar material with superior performance, on the basis of experiment, this paper takes the composite of sulphoaluminate cement and ordinary portland cement as the basic cementing system, mixes fly ash to form the composite cementing system, uses medium sand as aggregate, and mixes it with proper amount. The retarder, early strength agent, superplasticizer and dispersible latex powder are prepared with self-leveling effect, quick hardening and early strength, good workability, and meets the requirements of mechanical properties. The process performance and mechanical properties are ideal, low modulus of elasticity, impervious water resistance, dry shrinkage resistance, good frost resistance, high fluidity, and less loss of fluidity within 30 minutes, which gives the site irrigation. Joint construction left enough time; 1 D flexural strength to 1.0 MPa, 1 d compressive strength to 5 MPa, to meet the rapid construction of the base, as soon as possible to open traffic requirements, to achieve the desired results. The mix proportion design thought, and prepared with early strength, self-leveling effect of the filling mortar, and the price is significantly lower than the high-performance grouting material on the market. 2. Taking the grouting material purchased on the market as a comparison group, the flexural strength, compressive strength, splitting tensile strength, static compressive modulus of elasticity of the homemade mortar were tested. The flexural strength, compressive strength and splitting tensile strength of the self-made mortar can meet the requirements of the composite base structure for the filling materials. It is suitable for the joint of the composite base. 3. Taking the self-made filling mortar and grouting material for durability. The results of several fatigue tests show that the impermeability grade of the self-made mortar is slightly higher than that of the grouting material, and the frost resistance grade is much higher than that of the grouting material, which is very suitable for the climate conditions in Northeast China. As a filling material, mortar mixed with glue is applied to the practical engineering of the test section of the auxiliary road of Changchun Feiyue Middle Road. The economic superiority of the material is calculated, and the core drilling sampling is carried out to verify the feasibility of the structure in the engineering practice.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U414
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