基于ACI规范的水下混凝土配合比设计及优化

Design and Optimization of Underwater Concrete Mix Proportion Based on ACI Specifications

本文基于美国混凝土学会(ACI)制定的水下混凝土配合比设计准则,严格遵循ACI 211.1—1991-R 2009《普通混凝土、重混凝土及大体积混凝土配合比选择标准》,运用四因素三水平的正交试验设计方法,进行了9组试验,以混凝土的抗压强度、和易性和坍落度作为评价指标,制备了不同配合比的混凝土试件并进行处理和分析。结果表明:在ACI标准的指导和正交试验的优化下,通过精细化的配合比设计,调整胶凝材料用量、粉煤灰掺量、粗细砂比例和外加剂掺量,确保水下混凝土结构的质量和性能,成功筛选出了最优的混凝土配合比方案。研究结果为中国建筑企业在运用美国标准时,提供了更精准和实用的参考依据。

This article is based on the underwater concrete mix design criteria developed by the American Concrete Institute(ACI),strictly following the ACI 211.1—1991-R2009“Standard Practice for Selecting Proportions for Normal,Heavyweight,and Mass Concrete”,uses a four-factor three-level orthogonal experimental design method to conduct 9 experiments,with compressive strength,workability,and concrete slump as evaluation indicators,prepares,processes,and analyzes the concrete specimens with different mix ratios.The results show that under the guidance of ACI standards and the optimization of orthogonal experiments,the optimal concrete mix proportion scheme is successfully screened through refined mix proportion design,adjusting the dosage of cementitious materials,fly ash content,coarse and fine sand ratio,and admixture content to ensure the quality and performance of underwater concrete structures.The research results provide a more accurate and practical reference for Chinese construction enterprises to apply American standards.