传统夯土改性试验研究

发布时间：2018-08-14 13:25

【摘要】：传统夯土墙具有就地取材,制作技术简单,造价低廉,以及无可比拟的可再生环保性等优越性能;但存在抗压、抗拉和抗剪强度低,容易出现裂缝等缺点。本文将根据西南地区的生土进行改性,增强其强度和耐久性。以聚丙烯纤维、碎石、可再分散性乳胶粉作为改性剂,土工格栅作为加筋材料改变整体特性,对传统生土墙体材料进行改性试验研究,然后通过测定改性生土材料的受力性能,对比抗压、抗剪、抗拉强度,并对该生土材料的耐水性进行对比试验。研究加筋复合生土墙体的受力性能,在充分发挥生土建筑优点的基础上,提高生土墙体的物理力学性能。试验结果表明,在夯土中加入合适掺量的聚丙烯纤维、可再分散性乳胶粉、碎石和土工格栅,可以有效地提高夯土的抗压、抗剪、抗拉强度和抗裂性能;其中又以加入1%(质量比)聚丙烯纤维、5%碎石(质量比)(5mm、10mm和15mm碎石质量比为1:1:1)和土工格栅的夯土改性方案最优。该改性方案可有效提高夯土墙体的承载力和抗震性能,可运用于新修夯土墙房屋的建造中。
[Abstract]:The traditional rammed earth wall has the advantages of local selection, simple manufacturing technology, low cost and unparalleled renewable environmental protection, but it has the disadvantages of low compressive strength, low tensile and shear strength, and easy to appear cracks. This paper will improve the strength and durability of raw soil in southwest China. Using polypropylene fiber, crushed stone, redispersible latex powder as modifier, geogrid as reinforced material to change the whole characteristic, the modification of traditional raw soil wall material was studied, and then the mechanical properties of modified raw soil material were measured. The compressive, shear and tensile strength were compared, and the water resistance of the raw soil was tested. The mechanical properties of reinforced composite raw soil wall are studied, and the physical and mechanical properties of raw soil wall are improved on the basis of giving full play to the advantages of raw soil building. The test results show that adding appropriate amount of polypropylene fiber to rammed soil can redistribute latex powder, crushed stone and geogrid, which can effectively improve the compressive, shear, tensile strength and crack resistance of rammed soil. The rammed soil modification scheme with 1% (mass ratio) polypropylene fiber (mass ratio) 5% (mass ratio) (5mm 10mm and 15mm = 1:1:1) and geogrid is the best one. The modified scheme can effectively improve the bearing capacity and seismic performance of rammed earth wall, and can be used in the construction of new tamped earth wall building.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU41

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