Abstract
Abstract Soil as a mortar aggregate may improve the physical-mechanical compatibility between the coating system and earth-wall substrate, as well as present greater durability when stabilised with cement. Based on these concepts, the physical-mechanical behaviour of mortars comprising soil, cement, lime and admixture was analysed to be used as coating for earth constructions. Cement-soil mortars using the ratio of sandy soil equal to or less than 1:6 in the cement:soil dosage shows a potential for an application as earth wall coating. However, to improve its workability in the fresh state, it is necessary to add hydrated lime or chemical admixture at a limited proportion so it does not damage the physical performance of the mortar. To qualify the cement-soil mortars for earth building coating, the minimum requirements for volumetric shrinkage, tensile bond strength and compressive strength must be met simultaneously and the following criteria are indicated: minimum compressive strength of 4 MPa; zero volumetric shrinkage index and minimum tensile bond strength of 0.20 MPa.
Highlights
IntroductionEven though cement-soil use as a construction material has increased, there are few technical specifications and standards regarding its use, especially concerning its dimensions, compositions, dosage or for the different techniques of applications such as blocks, bricks or rammed earth walls, let alone for bonding, coating and the recovery of mortars
Searching for buildings that develop concepts of sustainability and energy efficiency, as well as cement-stabilised earth based construction has been highlighted (KARIYAWASAM; JAYASINGHE, 2016; CORREIA et al, 2016).Even though cement-soil use as a construction material has increased, there are few technical specifications and standards regarding its use, especially concerning its dimensions, compositions, dosage or for the different techniques of applications such as blocks, bricks or rammed earth walls, let alone for bonding, coating and the recovery of mortars
Cement-soil mortar is a suitable alternative for earth wall coating to achieve durability and conservation of earth buildings, as there is mechanical compatibility between the components of the system
Summary
Even though cement-soil use as a construction material has increased, there are few technical specifications and standards regarding its use, especially concerning its dimensions, compositions, dosage or for the different techniques of applications such as blocks, bricks or rammed earth walls, let alone for bonding, coating and the recovery of mortars. Mateus, Veiga and Brito (2015) defined some important characteristics that mortars must have to rehabilitate constructions made of soil as it is common to use lime-soil-sand composites to protect rammed earth walls in Portugal. The small proportion of lime in the mortars might cause the presence of powdery materials, of different natures that have a clayey base, that justify the higher water absorption and lower durability of the earth wall
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