Applied Mechanics and Materials Vols. 174-177

Abstract: A series of experiments are carried out to investigate the mechanical performance of bamboo fiber reinforced concrete, including the cubic compressive strength and splitting tensile strength. The experimental results show that bamboo fibers can enhance the cubic compressive strength and remarkably improve the splitting tensile strength of concrete. In addition, the effects of various bamboo fiber content and length on cubic compressive strength and splitting strength are also discussed respectively.

Abstract: This paper presented the synthesis of fluorosilicone copolymer latex with dodecafluoroheptyl methacrylate(G04), vinyl triethoxysilane(DB-151), methyl methacrylate(MMA) acrylic acid(AA), butyl acrylate(BA) by emulsion copolymerization and characterized by FTIR. The physical properties are also measured by particle sizes and distributions, water absorption, pencil hardness, circle adhesion method, etc. The obtained fluorosilicone latex showed us excellent comprehensive performance compared to the common acrylate latex.

Abstract: Nano SiO2 is employed in this research to modify the epoxy resin structural adhesives, and the law how different volumes of nano material influence the tensile and adhesive properties is studied. The experimental results indicate that incorporation of Nano SiO2 improves the tensile and adhesive properties of structural adhesives, yet if its volume fraction exceeds 5%, the modified result is undeniable. Moreover, high-temperature processing of structural adhesives will achieve better properties.

Abstract: Saline soil in inshore is a kind of special soil with poor engineering properties such as salt expansion and subsidence. The main purpose of this subject is to find a new material to solidify saline soil, so as to solve the fundamental problems that exist in the solidified saline soil at present. Through the chemical analysis, the unconfined compressive strength, SEM analysis experiment, this paper studied the strength and microstructure of solidified soil with the slag cementitious material. The test results showed that the 7th day’s strength of the test blocks which were cured in the standard case reached to 8.34MPa, the water-related stability was 1.62 times than the soil-cement when the mixing mass is 10%. The soil generated a large number of needle-bar-like crystals in the SEM graph. The research has shown that mixing slag cementitious material into the saline soil can reduce the soluble salt content of saline soil, increase water-related stability and improve the strength of the soil.

Abstract: Modified sulfanilate-phenol-formaldehyde condensate (MSPF) was synthesized by a reaction among soda lignin, sodium sulfanilate, phenol and formaldehyde. Optimal conditions of synthesis were obtained by studying the effects of raw material consumptions and reaction time on the dispersive property of products. Evaluation the applying performance of MSPF indicated that this new superplasticizer has an excellent water-reducing effect, and it can improve the compressive strength of hardened concrete obviously, especially the latter compressive strength. Most important of all, MSPF not only inherits the slump-maintaining capacity of aminosulfonate-based superplasticizer, but also overcomes the shortcoming of bleeding by improving the water retention capacity and reduces the segregation of mortar or concrete. Results show that MSPF is a potential superplasticizer for the high-strength and high-performance concrete.

Abstract: The article mainly develops and analyzes the technical and economic indicators of mortar mixed with flax stalk fiber and the material used for producing mortar mixed with flax stalk fiber. The length-fineness ratio and the proportion of flax stalk fiber in mortar have been determined by experiments. Additionally, this article also analyzes various economic indicators of mortar mixed with flax stalk fiber. Proper mixture of flax stalk fiber with mortar can improve and enhance thermal insulation performance of buildings and the crack resistance capability of plaster layers. The result shows that this method can lower the weight of plastering by 42.46 per cent and reduce the cost of plastering by 33.36 per cent. This new material has shown its superior energy saving and environmental friendly features. Therefore, the material has a broad practical potential in constructions.

Abstract: In this paper, thermal insulating bonding mortar has been produced by the spent polystyrene foam particles, cement, sand, tackifier and water etc. It shows that thermal insulation performance and compressive strength of thermal insulating bonding mortar are similar with those of aerated concrete by comparison tests. In this paper, the new wall is made by thermal insulating bonding mortar and aerated concrete blocks, and the results show the thermal insulating performance of this wall can be improved and its cold bridge impact can be eliminated too. Correspondingly, the energy saving effect of buildings can be improved rapidly.

Abstract: In this study, plant-mix hot reclaiming asphalt mixture can be used to surface and sub surface taking DAC-13I and DAC-20I asphalt mixture with five different RAP contents as 0%, 10%, 20%, 30%, 40%. The fatigue, rutting, water damage and cracking tests in laboratory have been taken to evaluate the road performance, and flexure, rutting, asphalt content tests have been taken on the trial sections to evaluate the practice road performance. The result of tests shows that plant-mix hot reclaiming asphalt mixture should be good service performance as new asphalt mixture when the RAP content is appropriate.

Abstract: Admixture mineral has been replaced part of cement in high performance concrete to improve the durability and sulfate resistance of the concrete.In this paper,the compressive strength of the concretes with adimixture mineral and without admixture mineral had respectively measured after 28ds’ standard curing.Then the concretes had been immersing in NaSO4 solution and MgSO4 solution.The compressive strength of the concrete with admixture mineral and without admixture mineral has been measured after 28ds’and 56ds’ immersing in NaSO4 solution and MgSO4 solution. The concrete with admixture mineral had been eroded lower than the one without admixture mineral after 28 days and 56 days.

Abstract: Chloride ions were harmful to the performance of the concrete.Admixture mineral had been replaced part of cement in high performance concrete to improve the durability and chloride resistance of the concrete.In this paper,the compressive strength of the concrete with admixture mineral and without admixture mineral had been measured cured after 28 days. The results had been shown that the compressive strength of the concrete without admixture mineral is lower than the one with admixture mineral after 28ds’and 56ds’ immersing in 5%NaCl solution. The quantities of electricity through the concretes with 30% admixture mineral were lower than the benchmark concretes. The current of C30 and C40 concretes with admixture mineral was lower than the benchmark concretes.The concrete with admixture mineral had been eroded lower than the one without admixture mineral.