Applied Mechanics and Materials Vols. 204-208

Abstract: Abstract: The experimental research on the effect of different incorporation of granite powders on the workability, mechanical property and impermeability performance of concrete is carried out. The result show that the concrete with an appropriate dosage of granite powder exhibits favorable workability, impermeability performance and cohesiveness. And granite powders agree with cement-based materials. Within some dosage of granite powders, the compressive strength of the mixture is approximate to that of common concrete. When the 10% of cement was replaced by the granite powder, good impermeability performance exhibits, with the relative permeability coefficient 30% lower than that of common concrete.

Abstract: Aiming at the basal layer demand on pavement performance in Tu – Wu Highway of Baicheng diversion road, based on the theory of gradution in mixture, experimental studies have been done in grade of gravel and road performance of stabilized gravel by cement and fly-ash. The right amount of cement and fly-ash in mixture can improve spatial structural components of mixture and its mechanical properties. Base on these measured datas, the mixture of cement and fly-ash mixed in the gravel is reasonable and feasible，and the results show its mechanical properties rely on mix proportion of the basal layer.

Abstract: The influences of KCl on the performance of G-Grade oil-well cement are discussed in this article. The macro performances including the rheological property, filter loss of slurry and the thickening time, strength and shrinkage of cement are tested. And the reasons why those influence could happen are explained by analyzing the microscopic structure of the cement. The results show that: KCl takes participation in hydration reaction of cement, KAlSiO3 and Ca4Al2H0.34O6.34Cl1.67 are generated in the reaction that could improve the compressive strength of the cement and reduce the shrinkage of the cement, but there is a limited added amount, less than 12% (BWOW) is the best.

Abstract: This template is mainly about the analysis of mechanical property of SCC in a flow state in the V-Funnel. It aims to establish the testing formula of rheological constants by Engineering Fluid Mechanics, which can provide academic basis for V-Funnel test of SCC properties. MATLAB image process technique was introduced in the process which can greatly improve its precision and reliability. It can also provide a new train of thought to experimental data.

Abstract: Do static load compression tests and dynamic impact tests on concrete specimens containing different silica fume contents with universal testing machine and SHPB experiment device to study strength mechanism of silica fume concrete. The results show that silica fume can significantly improve compressive strength of concrete. The best content is 16% and its impact resistance increases by 27% compared with plain concrete.

Abstract: The present paper deals with experimental studies on the tension-tension fatigue properties of 316L stainless steel by using a servo-valve controlled electro-hydraulic testing machine at room temperature. The low cycle fatigue properties of 316L stainless steel were studied and the initiation mechanisms of fatigue cracks were investigated and analyzed with scanning electron microscopy (SEM). Preliminary results indicate that the S-N curve of 316L stainless steel descends linearly in the low cycle regime and fatigue failure initiates from inclusions/defects on the specimen surface.

Abstract: It investigated the influence of superplasticizer on anti-carbonation property of different strength grade concrete with seven kinds of polycarboxylate superplasticizer. The results indicated that concrete carbonation property would be more impacted by superplasticizer for low-strength concrete. With the growth of the concrete strength, the impact gradually decreased. The anti-carbonation property of concrete could be improved by using an appropriate amount of compound mineral admixtures or lowing water-binder ratio.

Abstract: Fractal theory was introduced to study the asphalt mixture aggregate gradation which shows visible fractal characteristics, and the fractal dimension of seven different gradations of ATB-25 were calculated quantitatively. Then the rutting test was carried out, and the results show that the fractal dimension of aggregate gradation has a good correlation with the dynamic stability of asphalt mixture. Finally, the paper proposes a multiple linear regression formula which may more accurately predict the high-temperature stability of the asphalt mixture with different gradations.

Abstract: This paper investigated the mechanical strength and shrinkage properties of the concrete mixtures frequently used in Florida. The concrete mixtures were proportioned with three different types of coarse aggregates, such as Miami Oolite limestone, Georgia granite and Stalite lightweight aggregate, and two mineral additives, including fly ash and slag. And fourteen concrete mixtures were evaluated on their characteristics of compressive strength, elastic modulus and shrinkage for 91 days. The empirical relationship between the mechanical properties of concretes and shrinkage strain was analyzed mathematically. The results indicate that the compressive strength and elastic modulus of concrete are exponentially related the shrinkage strain of concrete. The finding from this study is agreeable with that by Troxell et al [5]. Also, the effectiveness of ACI 209 and CEB-FIP models on predicting the shrinkage behavior of concretes used frequently in Florida was evaluated. The result indicates that CEB-FIP model gives more reliable prediction than ACI 209 model does.

Abstract: The corrosion behavior of reinforcing bar HRB335 in 3.5 wt.% NaCl solution was investigated, and the tensile mechanical properties after corrosion were tested. The results showed that, with the increase of corrosion time, the corrosion rate of reinforcing bar HRB335 increases and the corrosion becomes heavier. Meanwhile, the yield strength and tensile strength decrease, but the elongation decreases at first and then increases.