浅谈水下不离析混凝土配合比设计及工程应用

• 作 者: 江大骐 黎先访
• 机 构: 中交二航局南方工程有限公司,
• 出 处: 建筑知识
• 发表日期: 2017年10期
• 关键词: 混凝土配合比 絮凝剂 配合比设计 混凝土拌和物 混凝土封底 水下混凝土 封底混凝土 钢吊箱 泌水 扩展度

水下使用普通混凝土封底或堵漏,混凝土容易产生泌水、离析、松散,难以成型;即便采用水下混凝土也难以达到理想封底效果。为了克服上述施工难点,人们生产出了一种新型的材料--絮凝剂,在普通水下混凝土配合比设计基础上加入合适量的絮凝剂配制而成混凝土称其为水下不离析混凝土(也叫水下不分散混凝土)。本文结合广州市南沙区凤凰一、二、三桥工程第二合同段(凤凰二桥)河中承台封底混凝土,重点介绍水下不离析混凝土配合比设计及应用,为以后类似的项目提供参考。

Underwater use of ordinary concrete back cover or plugging, concrete prone to bleeding, segregation, loose, difficult to shape; even with underwater concrete is also difficult to achieve the ideal back cover effect. In order to overcome the above construction difficulties, a new type of material, flocculant, has been produced, which is prepared by adding an appropriate amount of flocculant to form a concrete, which is called underwater unresolved concrete Called underwater undispersed concrete). In this paper, we will focus on the design and application of the mix proportion of underwater unpaved concrete with reference to the back cover concrete in the second contract section (Fenghuang Second Bridge) of Fenghuang first, second and third bridges project of Nansha District, Guangzhou City, and provide references for similar projects in the future.