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The common design methods for axial bearing capacity of driven piles in sand include conventional API method and four CPT-based methods, namely ICP-05, UWA-05, Fugro-05, and NGI-05. However, the reliability and accuracy of these design methods are still unclear, mainly owning to the lack of high-quality static load test data that can be used to evaluate the performance of these methods. High-quality database is also useful in the verification of any new design method. A new ZJU-ICL sand database consisting of 118 high-quality static load tests was established by expanding some commonly used databases by adding new test data. The database assessment of five design methods for axial bearing capacity of driven piles in sand was performed by using statistical method.

With the rapid development of the domestic economy, China’s infrastructure construction has also maintained rapid growth. Some major projects have been proposed immediately, not only does it have a huge demand for concrete, but it also has very high demands on the quality of concrete. Concrete admixtures are chemical substances added to concrete. Reasonable use of admixtures can effectively improve the properties of concrete. In recent years, with the continuous improvement of the quality requirements of concrete in the construction industry and advances in chemical technologies, many new chemical materials have been used in concrete admixtures, and it has become necessary to study the effect of admixtures in concrete. The types of admixtures are various. In this paper, the effects of antifreeze, hardener and compound admixtures in concrete are explored, which provides technical guidance for the application of admixtures in concrete.