Addition for producing thermally conductive mortars and structural concrete

Abstract

The invention relates to an addition for producing thermally conductive mortars and structural concrete, said addition being a specific powdery formulation in each case, which, when added as an addition to a conventional concrete or mortar, allows the production of a structural concrete or mortar with improved thermal characteristics (thermal conductivity ). If the addition is added to a conventional concrete in a plant, a structural concrete with increased thermal conductivities is produced, which can adapt to the thermal requirements of the building, thereby being highly suitable for the heat activation of structures or the geothermal activation of foundations. The concrete containing the addition takes on special rheological characteristics which, inter alia, allows a self-compacting concrete to be produced. If the addition is added to a conventional mortar in a mixer, a mortar is produced with very high thermal conductivities which make it highly suitable for geothermal probes.

Claims

1. An addition for thermally conductive structural concretes and conductive mortars, characterized in that it contains the following components: 80% of calcareous fine aggregate with respect to total weight, with particle sizes less than or equal to 4 mm Polycarboxylate ether based super plasticizer powder additive or derivatives thereof in a proportion of 1.9% of total weight Cellulose ether based viscosity modulator or derivatives thereof in a proportion of 0.1% of total weight powdered graphite in a proportion of 5% of total weight, with size less than 1 mm and with carbon content >80%.

2. A method for obtaining greater or lesser conductivity of concrete or mortar the method comprising: adding a thermal addition, including the following components: 80% of calcareous fine with respect to total weight, with particle sizes less than or equal to 4 mm Polycarboxylate ether based super plasticizer powder additive or derivatives thereof in a proportion of 1.9% of total weight Cellulose ether based viscosity modulator or derivatives thereof in a proportion of 0.1% of total weight powdered graphite in a proportion of 5% of total weight, with size less than 1 mm and with carbon content >80% modifying the proportions of the components, or adding a greater or lesser amount of thermal addition to the concrete or mortar to obtain thermally conductive structural concretes and thermally conductive mortars.

Description

PREFERRED EMBODIMENT OF THE INVENTION

(1) Although the possible total dosages may be very high depending on needs, particularly those relating to mechanical resistances and conductivities, a preferred embodiment would be that concrete for the foundations of a building with geothermia where there is a need to activate said foundations in order to use the geothermia for efficient and renewable climate control, without heavy investment in a probe field to fully supplement climate control and possible sanitary hot water (SHW) needs.

(2) If a conventional concrete typified or designated as HA-30/8/20/IIb is that used, it is advisable for the cement used to be of the cement type; if using other type cement, preliminary verifications must be made to avoid possible unexpected interactions.

(3) In conventional concrete, it is not necessary to modify the dosage of the cement, the usual worksite additives (plasticizers), coarse aggregates and fine aggregates. But the amount of water or w/c (water/cement) ratio is possible to make an adjustment as a consequence of mixing with the thermal addition.

(4) For each m.sup.3 of conventional concrete indicated (2,500 kg/m.sup.3), in this preferred embodiment 50 kg of addition are added per m.sup.3 of conventional concrete.

(5) The addition containing (5 constituents): 80% of calcareous fine aggregates 1.9% of superplasticizer additive 0.1% of viscosity modulator additive 5% of finely powdered conductive graphite

(6) When added to the described concrete, a structural concrete with a w/c ratio of 0.57 was obtained, with average resistances greater than 55 MPa, very dense and self-compacting. The thermal conductivity of approximately 3.5 W/(K.Math.m) is very convenient for a granite terrain, such as that of the preferred embodiment.