چكيده به لاتين
Abstract:
Self-compacting concrete has a special position as a high consumption material in the construction industry. The use of appropriate additives increase the workability and fluidity of this type of concrete. In order to improve the properties of cement and reduce its consumption due to the production of carbon dioxide, researchers have always sought to add cement as a supplement to improve its properties and reduce cement consumption. Nanomaterials have been considered in concrete structures as an alternative to percentages of cement consumption and using them are increasing, recently.Nanohalloysite has one dimentional and it has been considered due to the pozzolanic property and the structure of its shape. This nanoscale is a mineral clay. It is a combination of aluminosilicate and has a tubular and hollow structure. Due to its filling role, it creates a denser structure for concrete and concrete compounds, Therefore, it can be used as a good option for improving the properties of self-compacting concrete. It should be noted that the uniform shrinkage of these materials can cause stress concentration and loss of properties of the final nanocomposite. In this research, The study of factors affecting the spread of nanohalocytes in cement environment was investigated, at first. Agglomeresion of nanohalloysite occurs more faster, due to the alkaliity of the cementitious environment and the presence of ions in this environment. Proper nanomaterial dispersion allows them to benefit from their properties and thereby improve the matrix properties. The use of superplastisizer such as polycarboxylate was used to improve the dispersion of nanotube. Then, the use of different amounts of nanohalloysite was studied in terms of weight percent of cement substitute used in the manufacture of samples in self-compacting concrete. The goal of preparing self-compacting nanocomposite and its effect on mechanical properties and durability by using one-dimensional nanohalloysite. By examining the samples, it was found that nanomaterial does not have much effect on flexural strength and compressibility as mechanical properties of self compacting composites But in samples with 3 percent nano-halloysite, it improves durability properties such as water absorption, porosity and electrical resistance.
Keywords: Nanohalloysite, agglomeration, mechanical properties,durability, self compacting concrete
