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The Engineering Application on the Trans-Oceanic Bridge Construction of High Performance Marine Concrete

Author: ZhaoQingHui
Tutor: WangYouZhi
School: Shandong University
Course: Architecture and Civil Engineering
Keywords: Marine high performance concrete Durability Physical properties The mix design Composite mineral admixtures
CLC: U444
Type: Master's thesis
Year: 2010
Downloads: 173
Quote: 0
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Abstract

Concrete is indispensable in the modern civil engineering and the largest amount of the most versatile building materials. However, the growing phenomenon of ordinary concrete is not as good as had been expected, so the safety, durability and cause structural damage, and the resulting economic losses can not be ignored. Therefore, to enhance the quality control of concrete structures, it is the top priority of the project construction to meet the requirements of safety and durability. With the continuous advancement of concrete materials science, people began to study the high workability, high durability, and good volume stability of concrete, that is, high-performance concrete (HPC). High performance concrete, not only in performance than ordinary concrete greatly improved, also of great significance in the conservation of energy resources, improve working conditions, utilization of industrial waste residue, bad environment protection. China is in a period of rapid economic development, many costing huge marine structures such as cross-sea bridge, offshore drilling platforms have been or are about to build these structures in the harsh marine environment, the normal use of the long-term safety become the focus of attention of the engineering community . Marine high performance concrete, high performance concrete advantages by virtue of its performance, you can overcome the use of the environment to the harm of the building structure, to prolong life and improve the structural durability of purpose. A Bridge is currently under construction in the three cross-harbor sea, durable design life of 100 years. This thesis focuses on the specific requirements of the actual works, to carry out a test of a Bridge marine high performance concrete thematic research system to study the large volume mineral admixture physical and mechanical properties and durability of HPMC construction for the project to establish the scientific theoretical and experimental basis. The study showed that, CW, Mabe, Sika three kinds of the most excellent performance; reasonable adjustments to the composition ratio of the composite mineral admixtures, formulated to meet the the strength grade requirements of large volume mineral admixtures superplasticizer HPMC ; mixing mineral admixtures of HPMC contraction increase the proportion of fly ash and slag content should not be less than 3 1; HPMC temperature peaks later than the reference concrete about 25-30h, and its peak temperature lower by about 16 ° C; HPMC impermeability mixed with 40% composite mineral admixtures significantly improved impermeability grade up to P30; HPMC has excellent corrosion resistance, corrosion resistance coefficient can reach more than 0.9; HPMC carbonation rate higher than the reference concrete, but with the extension of the curing period, the carbonation rate coefficient is reduced to meet the 10-year design basis of the requirements when the concrete protective layer is 60m by calculating HPMC; mixing 40% compound mineral admixture HPMC has excellent resistance to chloride ion permeability of material, the Da <2 × 10-12m2 / s, the chloride ion content of the concrete at different depths obey certain functions, the C30 reference concrete, the C40 standard concrete and C30HPMC different depth of chloride ion content obey The first-order exponential decay function C40HPMC different depth on the chloride ion content in line with Boltzmann functions. Mixed with 40% composite mineral admixtures HPMC, a 6h electric fluxes in the range of 100-1000C, chloride ion penetration is very low, to meet the actual project against the requirements of the chloride ion permeability. In summary, this paper is based on a Bridge works in various scientific and reasonable test, the study of the physical and mechanical properties and durability of marine high performance concrete, for such projects in the future, under the harsh marine environment laid a good foundation for long-term use, at the same time play a reference to similar marine concrete structures construction.

The Engineering Application on the Trans-Oceanic Bridge Construction of High Performance Marine Concrete

Abstract

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