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首页> 美国政府科技报告 >Development of a Recommended Practice for Use of Controlled Low-Strength Material in Highway Construction
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Development of a Recommended Practice for Use of Controlled Low-Strength Material in Highway Construction

机译：开发在公路建设中使用受控低强度材料的推荐做法

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This report summarizes the results of a study on the use of controlled low-strength material (CLSM) in backfill, utility bedding, void fill, and bridge approach applications. CLSM, used in lieu of compacted fill in these applications, is a highly flowable material typically composed of water, cement, fine aggregates, and often times, fly ash or other by-product materials. This study, which included substantial laboratory and field components, demonstrated that CLSM is an effective and innovative material that can be used in each of the key target applications, with good short and long-term performance. CLSM, however, must be used in conjunction with a good quality control and quality assurance plan, and users must be aware of the unique properties of the material to avoid improper usage. This study highlighted some of these potential issues of concern and this report provides guidance on how to recognize potential problems and take precautions to avoid them. One area that was evaluated in detail was the issue of excessive long-term strength gain, which can lead to difficulties in future excavation. Through the laboratory and field components, the parameters that impact long-term strength gain were identified, including the effects of materials, mixture proportions, and climatic conditions.

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