Abstract
The main advantage of the structural composite material known as cement-stabilized rammed earth (CSRE) is that it can be formulated as a sustainable and cost-saving solution. The use of the aggregates collected very close to a construction site allows economizing on transportation costs. Another factor that makes sustainability higher and the costs lower is a small addition of cement to the CSRE in comparison to the regular concrete. However, the low cement content makes the compressive strength of this structural material sensitive to other factors. One of them is the composition of the aggregates. Considering the fact that they are obtained locally, without full laboratory control of their composition, achieving the required compressive strength of CSRE is a challenge. To assess the possibility of achieving a certain compressive strength of CSRE, based on its core properties, the innovative algorithm of designing CSRE is proposed. Based on 582 crash-test of CSRE samples of different composition and compaction levels, along with the use of association analysis, the spreadsheet application is created. Applying the algorithm and the spreadsheet, it is possible to design the composition of CSRE with high confidence of achieving the required compressive strength. The algorithm considers a random character of aggregates locally collected and proposes multiple possible ways of increasing the confidence. They are verified through innovatively applied association analyses in the enclosed spreadsheet.
Highlights
The association analysis applied to the database—thanks to its simple, understandable ratios—allows assessing of construction abilities of soil dug at a given construction site
The random character of the dug-at-site soil made the standards for designing Cement-stabilized rammed earth (CSRE) very conservative
It may happen that the achieved compressive strength is lower than the designed one with 100% confidence
Summary
One way to reduce the ecological impact and costs of construction works is to increase resource efficiency by reducing the transport of materials to the construction site [1]. This helps to ensure that construction is completed efficiently and on schedule. Cement-stabilized rammed earth (CSRE) is a response to the search for construction material with a low construction cost and low-energy demand. The soil used to erect the walls of the building usually comes from the construction site, which allows to significantly reduce the transport of building materials and to minimize the necessary supplies
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