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Abstract  

The properties of hydraulic mortars were studied by means of simultaneous thermal analysis (STA), according to a procedure proposed in the literature. Hydraulic limes, cement and/or slaked lime were mixed using different proportions of both inert and reactive aggregates, in order to test the effectiveness of such procedure in distinguishing the different degree of hydraulicity of such samples. The use of the normalized coordinates suggested in the literature results in overlapping of the clusters of different kinds of mortars. Modified coordinates are proposed, which give promising results in view of outlining a ‘master curve’ of hydraulicity.

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Abstract  

A high speed method of thermal analysis was developed to allow the carbonation profile of lime mortars to be followed within a convenient time-frame. The loss in mass on heating, up to 700C, of lime/sand mixtures of different proportions was related to the known quantity of lime in each mixture. It was shown that a heating rate of 50C min–1 produced data which had a very high correlation with known quantities of Ca(OH)2. Thismethod can be used to measure the extent of carbonation at varying depths through a limemortar. This can be repeated at intervals to give an insight into the shape and extent of the carbonation front as it develops over time.

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study and are represented in Table 3 . Lime mortars have been classified as having CO 2 /H 2 O ratio >10, while hydraulic lime mortars have CO 2 /H 2 O values between 4 and 10 and pozzolanic mortars have values <3 [ 3 , 22 ]. According to Cardiano et

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Abstract  

DTA/TG/DTG thermoanalytical investigation and X-ray diffractometry were carried out on hydraulic lime pastes obtained by mixtures of thermally activated red earth with lime. Hydration reactions proceed properly mostly due to the high silica and alumina content. In a long period of curing the paste presents calcium silicates hydrate in high quantities while there are moderate quantities of calcium monocarboaluminate hydrate, ettringite and gehelenite hydrated. In presence of chloride, pastes lead, after few days, a sensible acceleration of the hydration with the formation of calcium silicate hydrate and calcium chloroaluminate hydrate. The total amount of neo-formed hydrate products in the hardened paste, indicate a development of the solidifying/stabilizing capacity of the hydraulic binder.

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. Hanley S. Pavia S 2008 A study of the workability of natural hydraulic lime mortars and its influence on strength Materials and Structures

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of the Byzantine mortars which were mainly based on hydraulic lime or hydrated lime and pozzolanic materials as brick dust and pozzolana were well chosen by the size dimension of the aggregates according to the dimension of the joint, so that in the

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