A large number of experimental studies have shown that both vibratory mixing and multi-step mixing processes can improve the workability of concrete and improve the strength and durability of high-strength concrete(HSC). In this paper, for C60 HSC, two kinds of mixin g methods: conventional compulsory mixing and vibratory mixing, two kinds of mixin g technology: one-step mixing technology and three-step mixing technology are used to carry out contrast test. The purpose is to study the influence of mixing meth od and mixing technology on the performance of HSC. The research results show that compared with the one-step mixin g technology, the three-step mixing technology can significantly reduce the plastic viscosity of the concrete, improve its fluidity, and significantly improve the compressive strength at the age of and after 28 days and 56 days under the condition of the conventional compulsory mixing and the vibratory mixing. And the study found that the most suitable mixing method and mixin g technology for C60 HSC are vibratory mixing method and three-step mixing technology.
The technology of vibratory mixing has been applied to improve the compressive strength of cement-stabilized macadam (CSM). The aim of this study is to investigate the effect of vibration acceleration and cement dosage on the unconfined compressive strength and density of CSM. The mixtures with four cement dosages (2%, 3%, 4%, and 5%) were prepared by conventional mixing (0 g) and vibratory mixing (1 g, 2 g, and 3.5 g). The unconfined compressive strength was tested under different mixing methods. And the microstructure of CSM was analyzed by scanning electron microscope. The results indicate that samples using vibratory mixing have higher strengths, lower coefficient of variation, and denser microstructures, compared with the conventional compulsory mixing. Compared with 15% in conventional mixing, the strength variable coefficient of CSM is less than 10% in the vibratory mixing method. As the cement dosage and the vibration acceleration increase, the unconfined compressive strength increases. However, cement dosage has a more significant influence on improving the unconfined compressive strength than the mixing method. With the increase of every 1% in cement dosage, the 7-day strength of conventional mixing and in vibratory mixing average increased by 59% and 38%, respectively. However, the maximum improvement rate of the UCS value is 20–56.7% when vibration acceleration increased from 0 to 1 g. Especially when cement dosage is high, the effect of vibratory mixing on improving strength is limited. Besides, vibratory mixing reduces the original cement dosage by over 1.6% with the qualified unconfined compressive strength at vibration acceleration of 2 g, which is recommended in construction practice.
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