New approach for proportioning of controlled low strength materials

摘要

Controlled Low Strength Material (CLSM) can be a valuable application for the safe and efficient use of recycled and by-product materials. These nonstandard materials affect the mixture properties in less predictable ways, and hence, increase the number of trial batches required to attain the desired CLSM characteristics. In the present study, a laboratory experiment was carried out to explore an efficient methodology for proportioning CLSM mixtures without an extensive trial and error process.In the new methodology, CLSM mixture are proportioned using relative ratios between constituent materials, including the paste volume ratio to the total volume of mixture (PVR), mass ratios of water to cementitious materials (w/cm) and portland cement to cementitiuos materials (pc/cm). These parameters can be adjusted independently, and therefore, the proposed methodology allows for better understanding of the effects of the above parameters on mixture properties.The experimental results showed that the relative ratio parameters can provide adequate control over the relevant CLSM properties in terms of the ability to flow and compressive strength. The PVR parameter had a more significant effect on flowability compared to the w/cm ratio; though, it had little effect on strength development of CLSM mixtures. A mixture design procedure based on the new methodology is provided. (C) 2018 Elsevier Ltd. All rights reserved.