Key parameters for strength control of rammed sand–cement mixtures: Influence of types of portland cement

• Published in: Construction & building materials Vol. 49; pp. 591 - 597
• Main Authors: Consoli, Nilo Cesar, Festugato, Lucas, da Rocha, Cecília Gravina, Cruz, Rodrigo Caberlon
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2013; Elsevier B.V
• Subjects: Analysis; Cement; Cement type; Chemical properties; Compressive strength; Concrete; Mechanical properties; Porosity; Porosity/cement ratio; Rammed earth-cement wall; United States; Compressive strength; Porosity/cement ratio; Porosity; Rammed earth-cement wall; Cement type
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2013.08.062

•Key parameters for dosage of rammed earth–Portland cement walls.•Unique relationships achieved linking strength of rammed earth–cement blends with porosity/cement ratio and curing periods.•Normalization allows predicting effect on strength of varying cement content and porosity with given cement and curing time. The present research aims to quantify the influence of distinct types of Portland cement, amounts of cement, porosity, curing time period and porosity/cement ratio in the assessment of unconfined compressive strength (qu) of rammed sand–cement mixtures. A program of unconfined compression tests considering distinct types of Portland cement (types I, III and IV), porosities (η), cement contents (C) and curing time periods (t) was carried out in the present study. It was found that a ratio between porosity and cement [(η/Civ)−1.5] applies to all equations that control the strength of blends (for the curing periods and cement types studied here). The qu values of the specimens moulded for each cement type and curing period were also normalize (i.e. divided by the qu attained by a specimen with porosity/cement ratio equals to 20). It was found that a single power function adapts well to the normalized values for all the cement type and curing period studied. From a practical viewpoint, this means that carrying out only one (1) compression test with a specimen moulded with a specific cement time and cured for a given time period, allows the equation that controls the strength for distinct porosity and cement content to be determined.