Material And Structural Basic Performance Tests And Theoretical Analysis Research On Glazed Hollow Bead Insulation Concrete

With the growing global energy crisis and the implement of the relevant policies of building energy-saving, development of seismic, economic and land-efficient construction structural system became an significant subject in Civil Engineering field. Under this context, material and structural test and theoretical analysis research is meaningful on new energy-saving building material, glazed hollow bead insulation concrete .EPS board, XPS board, EPS powder particle, rigid polyurethane and other organic materials are main construction insulation materials in current construction markets.Furthermore, insulation engineering practice is that forming main structure of buildings, and then pasting or daubing insulation materials. These insulation system practices prolong construction process, increase construction costs, and have an unsatisfactory bearing and safety .Because of applyment of organic insulation materials, there existing some defects such as being easy to aging, impacting material using-span , resulting in different levels of indoor and outdoor environmental pollution and even increasing potential of building fire.For above reasons, pilot study was carried our from raw materials, blending ratio, basic mechanics, and thermal insulation performance of glazed hollow bead concrete in this paper, and theoretical simulation analysis of seismic and thermal performance of glazed hollow bead concrete was also done through combining specific projects. The details of research are mainly the followings:(1)The theoretical analysis and test have been done from productional development and modification aspects of glazed hollow bead material, which have laid foundation for the research study of glazed hollow bead insulation concrete.(2) According to the orthogonal design theory, the compressive strength and the thermal conductivity have been determined from 18 groups of glazed hollow bead insulation concrete specimen with different blending ratio, and then, the primary and secondary factors and sort results, that impact on the compressive strength and thermal conductivity of glazed hollow bead insulation concrete, are analyzed. Through the regression analysis, the relationship equation between the content of glazed hollow bead which is mixed in the concrete and thermal conductivity has been set up.(3) Based on the orthogonal test, the scheme that provides the optimal blending ratio has been selected to do further test. In following tests thermal conductivity, compressive strength and other performance indicators which belong to glazed hollow bead insulation concrete have been determined and damage characteristics of samples have also been analyzed,and then some important conclusions have been draw from that. The Portland cement grade 32.5, the aluminates cement grade 52.5, thickness of iron ore, thickness of turpentine rock tailings, admixtureâ… , and others were adopted in confecting glazed hollow bead insulation concrete with different contents of glazed hollow bead.(4) Three mix design that meet insulation requirements of the energy-saving project on coefficient of heat conductivity and compressive strength have been chosen. Under the uniaxial status, prism samples of above mix designs have been selected to do compression strength and deformation tests; Systemic analysis of the relationship between the strength and deformation for glazed hollow bead insulation concrete has been carried through, and some results have been provided,including the stress-strain constitutive relationship of glazed hollow bead insulation concrete with grades c25 to c35, prism compressive strength, strain, initial elastic modulus, residual strength, ductility, etc.(5) By use of the finite element analysis program ANSYS ,this paper set a shear wall building in Taiyuan as an example, adopted spectral analysis method, and made a contrast in seismic dynamic performance between glazed hollow bead insulation concrete shear wall structure and ordinary concrete shear wall structure; In order to keep the reliability of analysis results, seismic time history analysis of glazed hollow bead insulation concrete, which adopted the data of three pieces of earthquake wave, has been carried on in this paper. The seismic behavior of this shear wall have been studied as compared with the common concrete shear wall. Through the analysis, some relationships that the natural vibration period relationship between glazed hollow bead shear wall structure and the corresponding band plain concrete shear wall structure, the relationship between maximum angles of drift of layers of glazed hollow bead insulation concrete and allowance for angles of drift which the provision limited, the relationship of shear of layers between glazed hollow bead insulation concrete shear wall structure and the corresponding plain concrete shear wall structure have been proven. It is concluded that the glazed hollow bead shear wall structure could not only meet requirements of Earthquake Resistant Design Code, but also obtain a better seismic performance than ordinary shear wall structure.(6) Typical buildings in cold area and severe cold area were set as research objects , theoretical models for thermal analysis were also established in this paper through DeST-h software. The energy consumption situation of a single room , a single system and the entire building , which are in air-conditioning season, heating season and entire year situation, have been stimulated. The energy consumption between the building with glazed hollow bead insulation concrete structure and plain concrete structure are calculated separately. Based on the analysis about the energy consumption of entire heating season , air-conditioning season and overall year , the relationship of the energy consumption and the different envelope has been obtained. The results have indicated that glazed hollow bead insulation concrete construction should be capable of meeting requirements of 65% of energy saving building in cold area and goals of 50% of building energy-saving in severe cold area in our country.(7) The technology-economy analysis of glazed hollow bead insulation concrete construction have been proposed. The annual cost method was used to compare the economic efficiency in the glazed hollow bead insulation concrete construction and the thermal insulation system of EPS, XPS , glazed hollow bead insulation mortar etc. The results show that construction of glazed hollow bead insulation concrete is more advanced than that of other insulation system.. The results also show that the annual cost of glazed hollow bead insulation concrete construction can be decreased.Through theoretical analysis and tests, it can be proved that glazed hollow bead insulation concrete is a high-efficiency eco-environmental protection building material. The material is bearing general physical and mechanical properties of concrete, and it also has excellent thermal insulation performance.Based on the basic theory and method of engineering structure and thermal performance analysis, it is feasible for glazed hollow bead insulation concrete to be applied in the multi-layer and high-rise building. The performance of thermal insulation can meet the requirement of energy conservation design standard.'Glazed hollow bead insulation concrete'in this paper has been authorized to obtain the invention patent(ZL200610012726.2) from State Intellectual Property Office; The project is an important part of series research topics of glazed hollow bead insulation mortar research. Identified by the domestic experts . this project has achieved "the international advanced level.", and won scientific and technological progress second prize of Shanxi Province.