B) The preparation of mortar mixtures
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B) The preparation of mortar mixtures Three series of synthesis were prepared: A: with binder/aggregate 1:2 binding agents: lime-pozzolana 1:1 (A1), lime-pozzolana-white cement 1:0.8:0.2 (A2) lime-pozzolana-white cement 1:0.6:0.4 (A3) B. with binder/ aggregates 1:3

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B) The preparation of mortar mixtures Three series of synthesis were prepared:

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B the preparation of mortar mixtures three series of synthesis were prepared

B) The preparation of mortar mixtures

Three series of synthesis were prepared:

A: with binder/aggregate 1:2

binding agents: lime-pozzolana 1:1 (A1),

lime-pozzolana-white cement 1:0.8:0.2 (A2)

lime-pozzolana-white cement 1:0.6:0.4 (A3)

B. with binder/ aggregates 1:3

binding agents: lime-pozzolana 1:1 (B4),

lime-pozzolana-white cement 1:0.8:0.2 (B5)

lime-pozzolana-white cement 1:0.6:0.4 (B6)

C. with binder/aggregates 1:3

binding agents:

lime – pozzolana –clay 1:0.6:0.4 (C7)

lime-pozzolana-white cement-clay 1:0.4:0.2:0.4 (C8)lime-pozzolana-white cement-clay 1:0.2:0.4:0.4 (C9)


B the preparation of mortar mixtures three series of synthesis were prepared

  • These three main series were repeated by using superplastisizer and air-entraining agents.

  • Therefore, the synthesis

  • AS10, AS11, AS12 / BS13, BS14, BS15 / CS16, CS17, CS18, as well as the

  • AE19, AE20, AE21 / BE22, BE22, BE23 / CE24, CE25, CE26,

  • were also produced to check the effectiveness of admixtures.


B the preparation of mortar mixtures three series of synthesis were prepared

The proportion of the mixtures, are shown in the diagrams, while in the tables, some additional parameters are given (see APPENDIX).

A total number of 243 specimens (4x4x16 cm), was cast for the needs of different tests, which have to be applied.

Plasticity was also measured by using flow table, according to DIN 81555


B the preparation of mortar mixtures three series of synthesis were prepared

Graphics 1-9: Proportions of weight


B the preparation of mortar mixtures three series of synthesis were prepared

  • TESTS

  • The specimens of all mixtures were subjected to the measurement of::

  • Flectural – Compressive strength, at 14-d 28-d age, according to ASTM C 19-81

  • Modulus of Elasticity, at 14-d 28-d age, by using ultrasonic pulse velocity, ASTM C 597-71

  • Porosity at 28-d age, according to RILEM CPC 11.3

  • Capillary Suction (at the age of 28 days), NORMAL 11/85

  • Shrinkage deformation at 14-day age,

  • according to ASTM C 157-80


B the preparation of mortar mixtures three series of synthesis were prepared

  • CORROSION TESTS

  • (according to RILEM recommendations)

  • 28 days after the manufacture of the repair mortars, some corrosion tests took place.

  • Influence of humidity

  • Covering with tube water and weighting after 1-3-5-7-10 days

  • Influence of salts (Na2SO4 10% w.w.)

  • Covering with a dilution of Na2SO4 (10%w.w.) for two hours each day and desiccation in the oven for 24 hours. Weighting of the samples every two days. Each cycle consists of two days.

  • Influence of frost

  • Frost resistance is to be checked in relation with the addition of air-entrancing admixtures


B the preparation of mortar mixtures three series of synthesis were prepared

RESULTS

The results of all these tests are given below, in the form of tables and graphics.

Analytically, the measurements are included in the appendix.

Note: There are results based on the first measurements, since most of the tests are still running.


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