Advanced Materials Research Vols. 608-609

Abstract: Composite soils have been extensively used in civil engineering applications, especially in slopes, embankment dam and landfills. This paper aims to investigate effect of paper reinforcement inclusion on compaction characteristic of composite soil (i.e. clay composite). A series of laboratory tests performed to assess reinforcement effect on optimum water content and maximum dry unit weight of composite soils. Clay was selected as soil part of the composite and paper was used as reinforcement. The paper reinforcement parameters differed from one test to another, as paper length varied from 15 mm to 40mm and paper content were selected as 5% and 10%. For each test, compaction curved derived and the results were compared. The results proved that inclusion of paper affected compaction behaviour of samples so that increasing in paper content and length caused increasing in Optimum Moisture Content (OMC) and slightly decreased maximum dry unit weight.

Abstract: In this paper, a experimental investigation of application of room wallboard containing Phase-Change-Material / Lightweight-Aggregate composite (PCM-LWA) was carried out. A PCM-LWA composite thermal energy storage material was prepared by absorbing the paraffin. In such a composite, the paraffin serves as a latent heat storage material and the porous lightweight aggregate acts as the supporting material. Mixture of cement paste and epoxy were used to seal the PCM-LWA surface. Through comparing temperature curves of a general room model and the model using wallboards containing PCM-LWA, it can be known that the highest temperature of the room model using the wallboards containing PCM can be controlled in a narrow range. Therefore, room model assembled with the walls containing phase change material can effectively reduce the highest indoor temperature and the range of reduced temperature is about 2~4°C.

Abstract: Phase change materials have been widely used in energy efficient buildings for thermal energy conservation. Determination of the optimal phase change temperature and melting enthalpy is important to achieve the best energy saving performance. This paper presented a novel method to determine the optimal phase change temperature and melting enthalpy in a passive solar house based on analytical analysis. It was showed that the optimal phase change temperatures of PCMs in Copenhagen and Madrid are 23 °C and 22.6 °C. And the optimal melting enthalpy of the given house is 735.4 MJ/m3 for the whole winter. In addition, sensitivity analysis was applied to determine the most influencing fators to the optimal phase change temperature and melting enthalpy. The results showed that the most influencing factors are ACH and dimensionless thermal resistance number. The proposed method can offer guidelines to determine the optimal phase change materials in given buildings.

Abstract: This experiment was designed by making a coal gangue with coal gangue, fly ash, lime power and a small amount of cement mixture selected from Dongpang coal mine in Hanxing area.We tested the compressive rebound modulus strength of the mixture, and according to the method of uniform design, 8 groups mix ratio were designed and the experiments on the coal gangue mixture in various mix proportion have been conducted. The experimental results were analyzed by regression analysis model, and the regression equation between the compression rebound modulus of coal gangue mixture and the blending amount of each admixture was established. Finally, using this regression analysis model, the influence of the fly ash, calces, cement to strength on the compression rebound modulus of coal gangue mixture was analyzed.

Abstract: In order to analyze regeneration block mixed short columns and crack of recycled blocks, to flakiness ratio, mixing ratio, confinement coefficient and there are no ribs for the pilot study on main parameters, on root regeneration of thin-walled square tube 15 blocks of mixed axial compression test of short column. Research results indicates that: Specimen without ribs of ductility coefficient are going with flakiness ratio confinement coefficient of increases and reduces, approximate is linear relationship; and Specimen with rib short column of ductility coefficient are with flakiness ratio and confinement coefficient of increases and first increases then reduces, approximate is parabola relationship; internal concrete of Specimen without ribs of crack distribution concentrated in column Central, and internal concrete of Specimen with ribs of crack distribution along axis to more uniform, with ANSYS established model on internal concrete crack for nonlinear analysis. And experimental waist-shaped crease damaged concrete cracks occurred when parts of development corresponds to the situation.

Abstract: Modeling for complex spiral wire rope structures, on which the mechanical performances largely depend, are paramount to finite element analysis application. Three mathematical modeling thoughts were brought out to create the geometric models of wire rope strands. The first one was presented based on the centerline times of the helical structures, as the centerline times can be decreased through transitional coordinate system. For the second, the centerlines of the wire rope were formed by the helical movement of predefined point. In the third one, a local coordinate system which can be transformed into the world coordinate system by their relationship was employed. The above three ideas were implemented by different kinds of derivation. The geometric parameter equations were presented to express the accurate wire rope models. These approaches are beneficial for parametric modeling and analysis of wire rope strands.

Abstract: Due to global climate changes, Earth sustainability issues have become topics of international attention. The frequency of abnormal weather occurrences and disasters around the world has doubled and the health of the environment has been deteriorating, causing catastrophes around the world. All countries must have a prudent response to this situation. The environmental topics debated globally have changed from passive discussions about environmental protection and energy consumption to more proactive dialogues on sustainable cycles and LOHAS. Taiwan has actively proposed relevant environmental responsive measures, including plans for ecological cities, green buildings, and green building materials (GBMs). GBMs are the basic factor of environmental building projects and they have the most extensive scope of applications, as they have a direct effect on human health and are the key to the Earth’s sustainability. This research summarized international sustainability assessment systems, international green building material labels, and relevant building material assessment mechanisms, in order to summarize and integrate a variety of factors with the life cyclic assessment (LCA) of the ISO14040 series as the axis for establishing a preliminary green building material assessment system. In addition, the Fuzzy Delphi Methods was employed for analysis to discuss the green building material environmental load (Ln) factor and the green building material quality (Qn) factor. According to the research and analysis results, this research established the GBM Eco-Efficiency Assessment System in the context of climate change, to be used as the basis for subsequent research on GBM eco-efficiency standards. Using efficiency as a starting point, this research hoped to achieve a win-win strategy of balancing human health with the Earth’s sustainable development.

Abstract: Analysis of Chinese current development status of wall insulation technology, aim at the importance of building energy conservation in cold areas. Point out that developing energy-saving building wall is the key to development of building energy saving. In this paper, put a kind of an advanced self-thermal insulation walls as an example in Changchun area. Adopt Tsinghua university’s building thermal environmental simulation software DeST-c. Modeling analysis of building’s heating air conditioner operation consumption in the whole year under three different kinds of walls. Through the comparison we know that the structure adopting new self-thermal insulation wall has the most remarkable energy saving effect.

Abstract: This paper briefly introduces the main properties and four systems of rigid polyurethane thermal insulation foam intended for use in buildings for energy conservation purposes, and application development at home and abroad. Although the applications of polyurethane are widespread in architectural energy conservation, there are some problems just as high price, smoke toxicity, fire safety and so on thus it still occupies a small proportion in buildings for energy conservation purposes. It is no doubt that the function with high efficiency of thermal insulation, fireproof and low smoke density of rigid polyurethane foam conservation products is our goal.

Abstract: With enhancement of the energy conservation of the building and the external wall thermal insulation material fire protection level, the preparation of low density foam concrete has become the hot spot of the material engineer. The main factors, influencing the low density light foam concrete, include the selection and dosage of cementitous material and admixture, the volume of foam, water consumption and chemical admixture for concrete. This paper mainly discusses the effects of the dosage of water reducing agent, the admixture partly replacing SAC, the weight of water and binder and the volume proportion of slurry and foam on the density control of low density light foam concrete.