Advanced Materials Research Vols. 512-515

Abstract: La3+/ZnO composite antibacterial agent is made by the combination of Nano-ZnO and Rare Earth LaCl3 whose antibacterial properties are better than Nano-ZnO and Rare Earth LaCl3 themselves, that is, Nano-ZnO whose photocatalysis can be significantly improved by doping La3+,with the obvious coordination function. In this Paper, antibacterial agent was used to prepare the La3+/ZnO Rare Earth compound antibacterial imitation porcelain paint. At the same time, the influence of the antibacterial agent with different amounts and the major component in imitation porcelain paint to antibacterial property are discussed respectively. It shows that, when the antibacterial agent is mixed in the range of 8-9%,the antibacterial property of coating is very satisfactory, the major component of the imitation porcelain paint not only cause no influence on the antibacterial property of the compound antibacterial coating, but also enhances its water resistance and alkali resistance .

Abstract: Taking using construction waste as subgrade material in reconstruction project of G311 in Xuchang Henan for example,the construction technique and the quality test method are introduced,which can provide reference for similar construction.

Abstract: The influence of limestone powder, lithium slag and air-entraining agent on frost resistance of concretes was investigated by freezing-thawing cycle tests. The elastic moduli and weight loss rates of concretes before and after tests were checked. The results show the introduction of limestone powder into concrete is disadvantageous to its frost resistance, which gets worse as limestone powder contents increase. Air-entraining agent used in concrete can improve its frost resistance. The frost resistance grades of concrete containing a certain of air-entraining agent (0.2-0.4‰) can reach F1500, while it is below F300 for limestone powder concrete which is absent of air-entraining agent. The addition of lithium slag into concrete is helpful to frost resistance, and optimum mixing amount is 10%.

Abstract: Burning high-quality anthracite coal produces ash with a high content of unburned residues, which in many cases permanently exceeds 20%. These ashes usually contain high levels of amorphous phase providing the pozzolanic activity, this making them particularly useful if potentially applied in the construction industry. Such potential of effective treatment necessitates reducing the content of unburned residues, the best level here being less than 4% w/w. This paper deals with the results of testing heat treatment of fly ashes particularly using the resources of eastern Slovakia. Tests have shown that tested process of heat treatment can safely reduce the content of unburned residues in fly ash whilst maintaining high levels of the glass phase. Raw materials thus modified meet the requirements for the use in cellular concrete production technology with beneficial use of exothermic reaction heat from fly ash treatment in pre-heating the autoclaves.

Abstract: This study focuses on the preparation, thermal properties of alkanes eutectic mixtures (n-Octadecane/n-Eicosane, n-Octadecane/n-Docosane and n-Heptadecane /n-Eicosane) as candidate phase change material (PCM) for low temperature latent heat storage systems in building envelopes. Their melting temperature and latent heat were tested by Differential scanning calorimetry (DSC). The testing values were closed to calculation values of accepted theory that ensured the reliability of those datas. The results indicated n-Octadecane/n-Docosane eutectic mixture was more promising PCM for buildings in terms of melting temperature (25.3°C) and latent heat values of melting (158.2J/g).

Abstract: Noumenon sampling, a new detection technology for strength of structural concrete, is proposed.The conversion relationship between the strength of noumenon sampling specimen and the strength of standard maintenance specimen was explored by correction coefficient and regression analysis．the conversion coefficient for concrete strength between the standard curing specimen and the structural concrete was1.08, which is less than the specification of conversion coefficient(1. 10); therefore, the test result by noumenon sampling is more accurate and reliable.

Abstract: The pavement performance (CBR and modulus of resilient) of the weak chloride-based saline soil was studied by experiment. Samples were made through the static pressure method and vibration method. The test results for the samples under the conditions of non-soaking and soaking made a comparative study. The weak saline soil was analyzed as embankment feasibility. The results showed that: the pavement performance of samples made by vibration method was superior to that of static pressure method; the CBR value and modulus of resilient of samples could meet standard requirements when degree of compaction met the standard requirements. Weak chloride-based saline soil proved to be the road embankment fillers.

Abstract: In order to solve the technical problems of fine-grained weak saline soil subgrade compaction, combing with Qarham to Golmud highway project, this paper studied the compaction characteristics of the weak saline soil by experiment, determined the optimal vibration-compaction parameters, and compared with the compaction effect that relevant criterions proposed. The results show that vibration-compaction can make the soil fully compacted and compaction effect is better. Suggestion: it is best to adopt the vibration-compaction method to determine standard density and optimum water content.

Abstract: The engineering properties of rock salt in the salt lake region were studied by the geotechnical investigation, physical and mechanical tests and microstructural scanning. The results showed: the rock salt had many characteristics such as thicker layer, higher salt content, larger solubility, quicker leaching rate and easier dissolveing softening; natural rock salt close-grained microstructure and high limit compressive strength; rock salt did not soften and had smaller residual strain, which proved that rock salt was a suitable embankment packing in cyclic loading. Filling technology and disease prevention techniques of rock salt embankment are raised by combining new construction of the Qarham - Golmud highway and paving test road of rock salt embankment.

Abstract: Since the relationship between supply and demand of natural resources is on edge in the long run, the traditional extensive growth mode of economic development needs changing. Cement is widely used in construction. Producing cement needs large amount of natural resources and releases high waste emissions. By using Material Flow Analysis, the inputs and outputs of each part of manufacturing are analyzed scientifically and the inputs, outputs and efficiency indicators are accounted. The main hidden flows come from energy consumption, and the main harmful waste is CO₂ which comes from fuel combustion and CaCO₃ decomposition. Improving resource consumption efficiency and reducing CO₂ emission are the key ways to alleviate pressures on the environment.