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新型减缩膨胀剂是中国建筑材料科学研究总院近期研制的科研成果。该膨胀剂与目前在工程中普遍应用的其它品牌膨胀剂的本质区别在于:普通膨胀剂虽然在一定的龄期内有膨胀效果,但超过某龄期就会回缩,即所谓的“倒缩或落差”。新型减缩膨胀剂中含有一定的减缩成分,不仅膨胀效能高而且能阻止混凝土倒缩,基本不产生落差。不同品牌的普通膨胀剂其“落差”大小各异,同一品牌的膨胀剂掺量不同,落差也不同。本文论述了新型减缩膨胀剂(以下简称KL-Ⅱ)用于解放军某部办公楼地下室超长混凝土结构裂缝的控制与施工,各项技术指标达到了设计要求,取得了良好效果。
New shrinkage expansion agent is the recent research and development achievements of China Building Materials Academy. The essential difference between this expander and other brand expanders commonly used in engineering at present is that although ordinary expanders have an expansion effect in a certain age, they will be deflated beyond a certain age, so called “ Shrink or fall ”. The new shrinkage expansion agent contains some reduction components, not only high expansion efficiency but also to prevent concrete shrinkage, the basic does not produce a drop. Different brands of common expanders its “gap ” different sizes, the same brand of expander dosage, the gap is also different. This article discusses the control and construction of the new type of expansion and contraction agent (hereinafter referred to as KL-Ⅱ) used in the crack of the ultra-long concrete structure in the basement of an office building of the People’s Liberation Army. All the technical indexes have met the design requirements and achieved good results.