生土砌体砌筑泥浆生态改性配方研究

Ecological Modification Formula of Raw Soil Masonry Mud

针对在地震作用下生土砌体墙因砌筑泥浆强度低而沿灰缝处发生剪切破坏的问题,在考虑不破坏生土归田性的前提下,提出了生土泥浆生态改性配方以提高砌体抗剪强度。通过单因素、正交试验研究了糯米胶、丙烯酸乳液、速溶胶粉、纤维素等掺量对生土泥浆的抗剪强度、抗压强度和抗折强度的影响规律,得到改性泥浆最优配比,并在此基础上进行改性生土材料归田性分析及生土砌体抗剪试验。研究结果表明:泥浆经改性后,较传统非改性泥浆抗剪强度提高了50.55%,抗压强度提高了33.14%,抗折强度提高了23.48%;改性后的生土材料能使农作物正常生长,土壤成分分析符合植物种植标准,归田性没有被破坏;采用改性泥浆的生土砌体相较于未改性生土砌体抗剪强度提升了34.77%。

To address the problem of shear damage along the mortar joints of raw soil masonry walls under seismic action due to the low strength of masonry mud, the ecological modification formulas of raw soil mud to improve the shear strength of masonry were proposed without destroying the return to the field of raw soil. The effects of the dosages of glutinous rice glue, acrylic emulsion, instant glue powder and cellulose on the shear strength, compressive strength and flexural strength of raw soil mud were investigated by single-factor and orthogonal tests, and the optimal mix ratio of modified mud was obtained. Then the return to the field analysis of modified raw soil material and the shear test of raw soil masonry were carried out. The research results show that compared with the traditional unmodified mud, the shear strength of modified mud increases by 50.55%, the compressive strength increases by 33.14%, and the flexural strength increases by 23.48%. The modified raw soil material can make crops grow normally, the soil composition analysis conforms to the plant planting standard, and its return to the field is not damaged. The shear strength of raw soil masonry with modified mud increases by 34.77% compared with the unmodified raw soil masonry.