【正文】 good quality, cost of materials basically does not increase or increased marginally, for the different requirements of the project choose to use, the construction of lowmaintenance longlife pavement, road, its social, economic benefits are enormous, and worth promoting and continued research to promote the country39。 Includes % of tolerance。 with a large number of tiny holes lightweight aggregate to replace part of the normal aggregate, will be able to further improve this ratio. As the aggregate quality of different density of 2020 Kg/m3, pressive strength at 70 ~ 80 MPa highperformance lightweight concrete in a number of countries have already mercialized and used in ponent production. In Australia, Canada, Japan, Norway and the United States, highperformance lightweight concrete has been used in fixed and floating drilling platform。 (3) Reinforcement and templates in any gap, with a good through capacity, does not produce blocking. According to the requirements of these three characteristics, vibrationfree preparation of selfpacting concrete principles and methods section are as follows: Fresh concrete phase is a particle suspended solids, the continuous medium is a cement paste, which is liquid and Concrete Aggregates, pared with solidphase. All the particles in suspension, mobility and particle balance between segregation is necessary. Free vibration of fresh selfpacting concrete in the absence of external force to be real concrete formwork to give full fill all the gaps and achieve the pact, more importantly, to both good fluidity and stability. In order to obtain high mobility, we must first reduce the friction between the particles. Incorporation of superplasticizer to reduce the surface tension of particles of course is necessary, but vibrationfree performance requirements of selfpacting of view, alone doped superplasticizer was also difficult to achieve, needs to mixed with a certain amount of ultrafine material. To obtain good stability, so that materials are not disintegrate, the liquid must have the appropriate rheology, can not produce bleeding and prevent particle segregation. To achieve this request, also be mixed with an appropriate amount of particle size fine filler and in some cases mixed with viscosity modifying agent (tackifier). In order to be able to flow through the reinforcement of concrete and templates in the gap without creating any obstruction, in addition to the design of engineering structures be selected according to the appropriate particle size and morphology of aggregates, the liquid volume is the amount of its rheological properties important parameters. The rheological properties is based on the Bingham rheological model used to evaluate the viseter, and 濰坊學(xué)院本科畢業(yè)設(shè)計外文文獻(xiàn)及譯文 7 should have a low yield stress and plastic viscosity appropriate. By rheological point of view, vibrationfree matrix of selfpacting concrete is a free flow of ultrafine paste, the paste is made of cement and posed of fine material, the liquid surrounding the solid particles with the thickness of the serosal layer increases with the increase, while the serosal layer thickness of solid particles in the paste has been filled before the gap between the formation, therefore, the thickness of the slurry affects the shapes by solid particles. For the paste, apart from the requirements of high liquidity, the need of sufficient high viscosity, must be a highviscosity Newtonian fluid, in order to prevent segregation. Vibrationfree selfpacting concrete preparation process as shown. Cement ↓ Ultrafine admixture of water superplasticizer ↓ ↓ ↓ The free flow of slurry of fine aggregate ↓ ↓ The free flow of mortar of coarse aggregate ↓ ↓ Selfpacting Concrete Vibrationfree selfpacting concrete mix design, first make sure the gap under the aggregate liquid volume of content needed. The position of the liquid cement, water, additives, and ultrafine material. Super fine materials and the total aggregate volume ratio (S / A) is free of vibration of selfpacting concrete mix design in an important parameter. Zhenming, the mobility of selfpacting concrete will be with the S / A increased with the increase, while the elastic modulus of no significant impact. Basically, according to the required watercement ratio to determine the pressive strength of concrete. Vibrationfree selfpacting concrete due to the rheological behavior of volume and position of the material has a very close relationship, therefore, vibrationfree selfpacting concrete mix design is remended rather than weight ratio of the volume ratio. 濰坊學(xué)院本科畢業(yè)設(shè)計外文文獻(xiàn)及譯文 8 concrete in terms of performance on the remaining problems and to improve