Advanced Materials Research Vols. 446-449

Abstract: The biomass pellet fuel has the advantages of easily to be stored and transported，convenie -ntly to be used，clean and environmental friendly as well as high combustion efficiency. On the fou -ndation of studying combustion process, this paper obtained the industry analysis values of eight kinds of biomass pellet fuels by experiment. Combined with fire indicator of Fu-Zhang and combus -tion characteristics indicator of Yan Niu, the values of FZ and ZM are calculated, and then it is obtained that the decorative paper has the minimum ignition temperature, contrary the rice husk has the highest ignition temperature. Finally, by observing the morphology of ash after the burning of fuel combustion, it is pointed out that with increasing temperature from 740°C to 920°C, gray color of pell -et fuel gradually from black to white, hardness gra -dually hardened by the soft, even coke residue.

Abstract: In practical concrete structures, once reinforced concrete beams serve in case of over cracking or are even damaged due to sudden overloading, it is necessary to repair or strengthened the damaged members for purpose of restoring the structural capacities and keeping the structures working well. At present FRP strengthening technique is one of the most accepted methods available in civil engineering. This paper particularly presents a new FRP material，basal fiber, which is applied to strengthen flexural behaviors of reinforced concrete beams suffering from different amplitudes of cracking damage. Herein, total 4 reinforced concrete beams were tested including one reference beam and three beams strengthened with basalt fiber polymer sheets. The three strengthened beams were preloaded to an expected load and then strengthen by basalt fibers under loading. The test parameters are involved in different pre-loads and layers of basalt fiber sheets. During test some flexural behaviors were obtained in terms of variation of strain in concrete, steel bar and basalt fiber sheet, flexural deflection, collapse loads and the failure modes as well as cracking properties of R.C beams strengthened with basalt fiber sheets. The results of test indicated that flexural behaviors of the beams strengthened under loading with basalt fiber polymer could be improved in different degree with varied initial flexural moment and numbers of basalt fiber.

Abstract: Discuss monitoring way of slope sliding of ANGANG open mine on Robotic Measuring System TM30 technology and processing data’s method, according to survey speciafication of deformation observation, analyses deformation result and compares it with speciafication of deformation observation, reports it to the mine company to insure safety and stability of mine produce. Deformation monitoring on Robotic total station TM30 that is Observation flexible, high precision and high efficiency is worth spreading.

Abstract: After high temperature, mechanical properties and fire-resistant performance of concrete members has become one of the hotspots of study on fire resistance of structures. In this paper, the deficiencies of concrete beams at elevated temperature test and theoretical analysis are pointed out, the future prospects of concrete beams at elevated temperature is disscussed, some key problems are proposed to solve in the future.

Abstract: Based on desulfurization gypsum, blast furnace slag and steel slag (DGBFSSS), a new clink-free cementitious material with the meaning of saving energy and environment protection was invented. This paper further study on DGBFSSS in the application of cement stabilized macadam. The results show that DGBFSSS cement stabilized macadam with higher delay unconfined compressive strength and splitting strength, lower compression rebound modulus and better drying shrinkage performance than ordinary Portland cement stabilized macadam.

Abstract: The adsorption properties of the attapulgite and the rectorite were investigated by removal of a cationic dye, methylene blue (MB) from aqueous solution. The attapulgite and the rectorite were characterized by Fourier transform infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM). The analysis of the isotherm equilibrium data using the Langmuir and Freundlich equations showed that the data fitted better with Langmuir model. Pseudo-first-order and pseudo-second-order models were considered to evaluate the rate parameters. The experimental data were well described by the pseudo-second-order kinetic model. The results indicate that the attapulgite exhibited higher adsorption capacity for MB than rectorite and could be employed as a low-cost alternative in wastewater treatment for the removal of cationic dyes.

Abstract: Earthquake damage prediction of base-isolated structure includes many fuzzy factors, for example damage grade, intensity and so on, so by use of the fuzzy comprehensive evaluation method to predict the earthquake damage probability of the base-isolated structure should be feasible and effective. The isolated building usually consist of the isolated layer and the upper structure, so the damage grade of the base-isolated structure is divided by the performances of the isolated layer and the supper-structure. And then, the basic frame system of earthquake damage prediction based on fuzzy comprehensive evaluation method is established: the damage influence factors of the earthquake damage prediction for the isolated structure are analyzed, the corresponding hierarchy evaluations system is presented. Grade standard of damage influence factors and the determining method of membership degree for the base-isolated frame structure are given, and then the weight coefficients of the damage influence factors are studied by use of the judgment matrix analysis method, the fuzzy comprehensive evaluation model of earthquake damage prediction is given. Lastly, a numeral example is analyzed, the rationality of the method is proved.

Abstract: Both coal mine and land are important natural resources that human depend on for existence and development. Coal mining has contributed greatly to the development of economy and society in China. Meanwhile, subsidence induced by coal mining has seriously affected human life, ecological environment and development of regional economy in mining area. Thus, aiming at coal mining subsidence area, this paper puts forward two kinds of land reclamation techniques containing engineering reclamation technology and biological reclamation technology, which can scientifically guide land reclamation practice, coordinate relationship between human and land and relax ecological crisis.

Abstract: Forest coverage prediction based on least squares support vector regression algorithm is presented in the paper.Forest coverage data of Heilongjiang from 1994 to 2005 are used to study the effectiveness of least squares support vector regression algorithm.The prediction results of the proposed least squares support vector regression model by using the training samples with the different dimensional input vector are given in the study. It can be seen that the prediction results of the proposed least squares support vector regression model by using the training samples with the 3-dimensional input vector have best prediction results.The comparison of forest coverage forecasting error between the proposed least squares support vector regression model and the support vector regression model is given, among which mean prediction error of the proposed least squares support vector regression model is 0.0149 and mean prediction error of the support vector regression model is 0.0322 respectively.The experimental results show that the proposed least squares support vector regression model has more excellent forest coverage forecasting results than the support vector regression model.

Abstract: In recent years, Infrared thermal imaging technology has been widely used in the detection of construction quality relied on its distinguishing features of non-destruction, non-contact and low cost. But, there are many problems in practice, such as it is difficult to quantify the detection results and determine the best testing time. Aimed to several issues of the infrared-thermography method on detecting the defects of external wall, this paper discusses the determination of the optimum time and puts forward a method which can decide the defects quantitatively; it is the method of temperature rise rate.