Advanced Materials Research Vols. 1030-1032

Abstract: This paper presents the experimental results on the utilisation of Rice Hush Ash (RHA) as a replacement for mineral filler in asphaltic concrete pavement in Malaysia. Asphaltic concrete mixes containing RHA at different amounts and control specimens were prepared in accordance to Marshall Mix design, and their performance on stability, flow and bulk density were evaluated. Optimum binder content (OBC) and voids analysis were also conducted to compare performance of RHA at different contents. Results reveal that all RHA mixes have satisfied the Malaysian Public Works Department (JKR) specification on wearing course in regard with Marshall Stability and Flow, especially RHA-75. This material is potentially to be used as partial or fully substitution of mineral filler (stone dust) in pavement construction.

Abstract: As a prevalent phenomenon, there are many streambed forms in rivers. The distribution of them was obviously in certain orders. This paper carried out numerical analysis and field work in natural rivers, to study the law of streambed forms' distribution. The results indicated that: A streambed profile can be considered as an overlay of two parts: the average streambed line which reflect the total slope (called 'Trend part'); the wave line vibrating along this average streambed line which reflect the effect of bed forms (called 'Form part'). The two parts were then distinctively separated by the wavelet analysis. Then the distribution of bed forms can be calculated and analyzed more scientifically.

Abstract: Natural foundation in loess areas is collapsible; however, composite foundation with rammed soil-cement pile can be used to meet the load requirements of the building. Immersion-compression test and field static loading test were carried out to measure the treatment effect. The test results showed that: the collapsible of loess foundation can be eliminated by treatment with rammed soil-cement pile when the loading pressure is between 200 to 500 kPa. Engineering properties of the foundation soil between piles are improved. The parameters improve more obvious with the pile spacing getting smaller. The bearing capacity of composite foundation increased to 291 kPa, compared with natural loess foundation. The research results can be applied to design and construction of compacted soil cement pile composite foundation in loess area.

Abstract: It is vital to use acoustic emission technology to study on health monitoring of concrete. The aim of this study is to investigate the ability of the AE in order to test the effect of the stepwise displacement load on the damage mechanism of the concrete beams that embedded sensors under three-point bending. The result showed that as the damage increased, amplitude and energy increased. At the same time, embedded sensors can locate the position of the crack.

Abstract: Shrinkage and creep behavior of concrete are keys that affect bridge construction and usage. The C60 high performance concrete was prepared by adding high content mineral additives and reducing water-binder ratio. This kind of concrete has good work performance and higher pumpability. It also has a low shrinkage and creep feature. Experiments were carried out to compare performance to concrete without mineral additives. Results show that its shrinkage and creep value decrease about 30% to 50% within long age of 360 days.

Abstract: Industrial structures deteriorate generally in an uncontrollable rate. To assess the short-term impact due to hazards and the long-term deterioration process due to physical aging and routine operation, structural health monitoring (SHM) is proposed. In this paper as a model of vessel a simply supported beam under constant distributed force is investigated. The objective is to estimate the severity of damage in a known location with sensing devices. As no actuation is consider the problem is solved statically. Finite element method by using MATLAB software to calculate the global stiffness matrix of the smart beam has been applied. It is expected the results show that higher severity of damage causes higher deflection and higher sensor of voltage.

Abstract: This paper summarizes the roller integrated compaction measurement values for earthwork compaction during and after the last representative soil properties。The European communities have began the comprehensive development of roller compaction measurement over m 30 years ago. The anagenesis of roller integrated compaction measurement values have been led to the estimation of more mechanistic soil parameters, for instance, stiffness, modulus.

Abstract: Geological structure health in mountainous area substation is complex, and the climate is changeable, it is easy to appear the geological disasters like landslide and subsidence in substation, Aiming at the strong electromagnetic interference in substation and other factors, to monitor of slope surface strain of mountainous area substation with FBG strain sensor, in order to reflect the stability of the slope. Combined with the actual situation of slope of Yunnan 220kV mountainous area substation, the surface type FBG strian sensors are installed on the surface of upstream and downstream slope of mountainous area substation, the lower reaches of the substation, the serial network forms a quasi distributed optical fiber sensing network. they form a quasi-distributed optical fiber sensing network through the serial networking methods.When the slope surface occurs deformation due to the soil sliding, it will drive the FBG strain sensor and transfer the equal strain to the FBG strain sensor. By measuring the center wavelength shift of the FBG strian sensor, the strian value of slope surface at each point can be reflected. The monitoring results show that, the period from May 9th to June 6th, the maximum strain of upstream slope is 171uɛ, it appears at the location of marked as US4 FBG strain sensor, the maximum strain of downstream slope is 112uɛ,it appears at the location of marked as DS1 FBG strain sensor.

Abstract: According to the study of added stories structure form for existing buildings, the basic form and characteristics of existing four added stories structure were analyzed and summarized in this paper. According to the research, light steel structure with added storey as a economic and effective method of strengthening design for existing building, it is promoted and applied widely. But there are some problems in the identification of design standard, the reasonable choice of structure scheme, the calculation of Seismic effect and constitution design to be solved.

Abstract: The rheological property of fresh high-strength concrete (HSC) and mechanical properties, self-shrinkage and resistance to chloride ion permeability of hydrated HSC were studied on the basis of the closest packing theory. Results showed that the packing density of composite powder was the highest when the content of microsphere was 30.0%; when the content of zeolite powder added to concrete varied from 0.0% to 4.0%, the rheological and discontinuous property of concrete would be improved and its viscosity would be increased; meanwhile, compared to the standard concrete, the self-shrinkage of concrete with 2.0% zeolite powder at 1d, 3d, 7d and 28d was decreased by 77.1%, 49.6%, 44.0% and 38.1% respectively; finally, the resistance to chloride ion permeability of hydrated HSC with zeolite powder was improved with a result of 18.5% reduction of electric flux at 28d.