Applied Mechanics and Materials Vols. 99-100

Abstract: As it ignorance the effect of intermediate principal stress, traditional Duncan - Chang model has limitation when applied into geotechnical engineering. It was improved through incorporating the effect of intermediate principal stress based on unified strength theory. Under the help of customized modification platform in ABAQUS, the applicability and stability of the improved model and the reliability of subroutine were validated through simulation of several examples. The results show the improved model can better reflect the deformation behavior of soil through taking the influence of intermediate principal stress into consideration. The improved model in paper can be applied into dense sand, fine sand and clay.

Abstract: Strain Hardening Cementitious Composites (SHCC) varied with mixture proportion was preparated with normal engineering materials in our area, tensile performance of dumbbell specimens under uniaxial tensile load was experimentally investigated in this paper, and tensile stress versus strain curves as well as crack development of SHCC with different mixture proportion were obtained. The results showed that all specimens had strain-hardening and multiple-cracking characteristics obviously, among them, ultimate tensile strain of No.A and C series could exceed 3%. SHCC with excellent stable tensile performance was preparated based on normal river sand but not quartz sand, which can reduce project cost and promote the application and development of SHCC in practical engineering.

Abstract: Sulfuric acid residue is one kind of important secondary resource, its comprehensive utilization has drawn extensive attention. Based on analyzing the chemical composition of sulfuric acid residue, through comprehensive comparison of flotation, gravity separation, magnetized baking, magnetic separation and other joint technical processes, it is showed that the chemical-magnetic separation is reasonable by evaluating the applicable ability. Then introduced a case study on comprehensive utilization of sulfuric acid residue in Shikefeng chemical Co., LTD in Luzhou City, the duplex melting process combined advanced induction furnaces with smelting furnace was put forward. Finally, it's concluded that there are many advantages of the duplex melting process, it’s more suitable for the comprehensive utilization of sulfuric acid residue in small chemical enterprise.

Abstract: The physical simulation test of similar material is one of the most common research techniques in the geotechnical domain. Because the experimental finding of physical simulation is directly affected by the physical mechanical property and stability of similar material, then selecting the fitting formulation, mixture ration and water content of the similar material for different investigated subjects to get the ideal similar material is the most attentive problem during the experiment. After researching the variational compressive strength and tensile strength with the water content of the synthetic material which is made of sand, cement, gesso with two mixed rations, the relation of second-degree parabola between the main mechanical parameter and the water content of the synthetic material is obtained, and the optimal rate of water content which can make the similar material reach the maximal compressive strength or tensile strength is obtained

Abstract: Diatomite/polyacrylic acid composite was synthesized by using inverse suspending polymerization method under different diatomite content, dispersant content and neutralization degree with orthogonal experiments. The surface morphology, structure and humidity controlling properties of composite were observed and determined. The results show that diatomite/polyacrylic acid composite is in a block like structure with different size. During the polymerization process, acrylate monomer is grafted with hydroxyl on the surface of diatomite and then inserted successfully into the void of diatomite. The impact of three factors on the humidity controlling behavior of composites increases by the order of dispersant content, neutralization degree and diatomite content. The optimum preparation parameters are diatomite content of 40%, dispersant content of 15%, neutralization degree of 90%.

Abstract: An experimental research was performed on the compressive strength and splitting tensile strength for HSC with various polypropylene（PP） fibers after exposure to temperatures 300°C, 500°C, 700°C, 900°C. Cubes of 150mm×150mm were designed and fabricated with C60, blended with silica fume and slag, mixed with PP fibers, respectively. These specimens were naturally cooled to room temperature after being heated in an electric furnace. No explosive spalling was observed during the fire test on all HSC with PP fibers. From the results of nine types of concretes, both the compressive strength and splitting tensile strength of HSC with PP fibers decreased with the increase of temperature. Through a series of measurement, the relationships between the mechanical properties and the various PP fibers in HSC were analyzed, including the dosage and length of PP fiber. Based on the comparison in the experimental results, the proposed optimum of PP fiber in HSC was 1.5kg/m3 under the test condition. In addition, PP fiber with the length of 8mm could be more applicable to use.

Abstract: The development of water based capillary inorganic water proofer is discussed in this paper. By practical engineering application research, the influences of water based capillary inorganic water proofer on concrete strength, impermeability, carbonation resistance, wear resistance and corrosion resistance are summarized. Finally, the prospect of application of water based Capillary inorganic water proofer is pointed out.

Abstract: This paper proposes a view to develop energy-conserving construction products made from synthetic material of wollastonite by means of joint-mold sleeve tube method and extrusion forming through the analysis on the energy consumption in the manufacturing process of traditional architectural terra-cotta materials. It conducts comparative study on energy consumption and carbon emission of traditional architectural terra-cotta products and energy-conserving construction products made from synthetic material of wollastonite and verifies the applicable value of low-carbon construction material, which is the basis for its development.

Abstract: In this paper, the fretting corrosion wear behaviors of steel wires were researched when the wires were lubricated with alkaline solution. Then, the wear mechanism was analyzed. Results showed that the friction coefficients of wires lubricated with alkaline solution were little influenced by the loads, while greatly affected by the electrochemical corrosion existing on the surfaces of the friction pairs. The shape of most of the fretting wear debris was tuberous or near spherical which owns smooth edges. This kind of wear debris was beneficial to reduce the fretting wear of steel wires. The depth of wear scar, used to evaluate the fretting corrosion wear of the steel wires, was increased with the increase of load. In addition, the wear depth of the wire lubricated with alkaline solution was not only less than which obtained in dry friction condition, but also less than which lubricated with deionized water and acid solution. Analysis showed that the corrosion solution played an important part in the fretting corrosion wear. And the effect of corrosion solution to the wear was stronger than which to the corrosion of steel wire materials.

Abstract: A law on the cumulative damage is presented basing on total strain energy induced as damage parameter to calculate the cumulative damage when the specimens of concrete subjected to fatigue loading.Then the maximum of critical cumulative damage and location of production are determined basing on the equation of cumulative fatigue damage combined with experimental result through using the finite element analysis and the critical plane method in fatigue analysis.The relation equation between the standardized critical total strain energy density and stress level is obtained by considering the impact of loading level.The fatigue life of specimens can be predicted by combining the equation of cumulative fatigue damage with the relation equation of damage and stress level and the prediction results coincide with experimental results very well.