Advanced Materials Research Vols. 535-537

Abstract: Steel is commonly used as the materials of anchor bolts in permanent anchoring works. The nature the steel anchor bolt easy to be corroded, however, poses a serious potential safety hazard to the anchoring system mainly including steel anchor bolts. To use GFRP(glass fiber reinforced polymer) anchor bolts instead of reinforcing bars is an effective means to deal with corrosion. Based on the test of accelerating aging in high solubility, the physical and mechanical performance tests are conducted on GFRP bolts in normal, acid, alkalis and salt conditions, from which the change law of physical and mechanical property can be studied for bolts in different corrosion conditions. As shown from the test results, the weight of GFRP bolt is reduced after it is corroded and the rate of weight loss increases as the corrosion time extends. Thick swelling can be seen on bolts in alkalis conditions. Loss rate of tensile strength and increase rate of elastic modulus are greater in alkalis conditions than in acid conditions, the former reaching 13.76% and the latter 9.83%. As for bolts in acid conditions, tensile strength decreases as the corrosion time extends while the rate and amount of loss is less than that of bolts in acid and alkalis conditions. The tensile strength decreases as the solubility of corrosion solution increases. The loss rate of tensile strength is the most for bolts in alkalis conditions; it comes second in acid conditions and the least in salt conditions. The elastic modulus of bolts in acid conditions and alkalis conditions increases while the rate is comparatively low as the solubility gets higher. Elastic modulus of bolts in salt conditions decreases as the solubility rises with lower rate and smaller amount of loss. These results supply test foundation for application of GFRP bolts in complicated geological conditions.

Abstract: Through laboratory testing, the main properties and effects of rubber particle and water-binder ratio of plastic concrete are researched. The results indicate if the rubber particle of plastic concrete with certain water-binder ratio increases and its elastic modulus decreases, there is no effect to the permeability coefficient of plastic concrete basically. If the water-binder ratio of plastic concrete is lower, its elastic modulus increases but permeability coefficient reduces distinctly. Therefore, the comprehensive utilization of the test of rubber particle with change of water-binder ratio can make up plastic concrete with lower elastic modulus and smaller permeability coefficient. It will provide a new method to solve the problem of plastic concrete with higher elastic modulus and larger permeability coefficient and meet the needs of a project.

Abstract: This paper takes styrene-butadiene latex with 37% solid contents, the portland cement of number 45r and fine sands with 0.2mm diameter to prepared similar material, the mass ratio of cement and fine sand is fixed, different ratio of the specimens are prepared by adjusting the latex ratio. The MATLAB fitting and ANSYS simulation calculation are used to compare to the date of soft rock. The analysis shows that the latex cement can be used for deep soft rock rheology theory and polymer materials similar simulation experiment.

Abstract: In the paper, the mountain of Siwu village was selectedd for the study. Combined with status of landslide, three typical profile of the slope were selected to carry out stability analysis, reinforcement scheme was proposed for the characteristics of each slope. Based on the field measurement, the fast Lagrangian numerical simulation (FLAC) was used to carry out comparative study of the quality of the two anchoring scheme. The results show that two reinforcement measures with anchor cable or anchor can be effective to provide slope stability.

Abstract: This work studies the possibility to produce the new novel brick by mixing between the local soil, local lime and burnt hull ash which is the waste in the earthenware industry. All materials conducted in this work are found in Ratchaburi province located in the western of Thailand. The chemical and mechanical properties are studied including the thermal conductivity will be determined. Varying burnt hull ash (BHA) contents are added into the combination and compared properties with the soil cement brick (RCB) at the same percentage weight. Results show that the compressive strength and flexural strength of soil brick mixed with 10% constant lime and varying burnt hull ash contents (CLBA) shows the maximum values at BHA of 25% by weight at water to powder ratio of 0.4225 and the thermal conductivity of CLBA is lower than that of SCB given as 43.98%.

Abstract: A modified agent GHPC-1 for green high-performance concrete was composed of the strength-increasing groups of organic alcohol amine, the slump-retaining groups of carboxylate polymer and the workability-stabilizing groups of amide. It could be used through substituting some of polycarboxylate water-reducers or combining with polycarboxylate water-reducers to modify the workability of fresh concrete and to increase the strength of hardened concrete. The adaptability tests of cementing materials with admixtures show that the dispersing ability was almost not influenced but the retaining ability of paste flowing was evidently enhanced if the substitution of polycarboxylate water-reducers have been to 20 %. The comparative tests of concrete indicated that as 20 % content of GHPC-1 was added in polycarboxylate water-reducers, it could modify the concrete workability. If adding 0.6 % with polycarboxylate water-reducers it could save water by 5 % and cement 10 % and simultaneously modify the workability and to enhance the strength, or to reduce water by 2.5 % and increase the strength of 28 d by 5~8 MPa.

Abstract: The finite element analysis software, during the pouring of concrete for the temperature field and stress field in a numerical simulation analysis. Analysis showed that the concrete core temperature changes greater maximum thermal stress in mass concrete bottom and around the site and soil transfer, far less than the concrete tensile stress, the temperature will not crack.

Abstract: China has the largest plywood production in the world. With the fast development of timber construction in China, plywood has been used as an important structural material for sheathing. It is needed to evaluate some performances for structural use, such as uniform load test. Plywood of different thickness is manufactured according to independent developed technology on a production line. The uniform load capacity was evaluated for wall sheathing. The results showed that those two types met requirements on structural performances of wall sheathings of PS2. It was suggested that the unnecessary high performance should be intentionally lowered by veneer combination of larch or other soft species.

Abstract: Three fire-resistant steels for construction were developed, which are low carbon Mn-Cr-Mo steel microalloyed with Nb and free Nb. The mechanical properties of the alloy were studied by tensile and impact testing. The effects of parameters in controlled rolling and controlled cooling process on the mechanical properties and the microstructures of the steel were investigated. It is found that the precipitation strengthening is important strengthening way to improve the elevated temperature strength of fire-resistant steels.