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EVERDURE CALTITE

Properties of EVERDURE CALTITE

Link to: Australian State Government Research document

University of Liverpool

A storage barn for road de-icing salt near Nottingham, U.K. was constructed using prestressed concrete panels incorporating EVERDURE CALTITE in all but two controls. The University of Liverpool is monitoring the concrete's performance.

Strengths of over 80 N/mm² were achieved at 28 days for both concrete. In spite of the obvious quality of the control, Figure 1 shows that concrete containing EVERDURE CALTITE (HPI) was far less permeable to both air and water and had a higher electrical resistivity. Fig.1

Queen's University

Queen's University of Belfast examined concretes modified with 10% and 20% silica fume and EVERDURE CALTITE using various in-situ test procedures. The results for concretes with a water/cementitious ratio of 0.4 are given in Figure 2.

EVERDURE CALTITE was found to be more effective in reducing surface abrasion and permeability than silica fume, the latter by a factor of ten compared with the control. EVERDURE CALTITE gave comparable compressive strength to the control while somewhat improving tensile strength. Fig.2

University of Surrey

A time-to-corrosion study was conducted in the Department of Civil Engineering on concretes with and without EVERDURE CALTITE.

The specimens were cast with reinforcing bars at 10mm, 25mm and 40mm covers and cured for 7 days. These were subjected to one week ponding with 5% sodium chloride solution followed by one week drying, before reponding with salt solution and so on for 17 cycles.

Potentials were measured with a "Saturated Calomel Electrode" (SCE). Results for 10mm covers are given in Figure 3. Reinforcement at 10mm and 25mm covers in the control were depassivated after 8 and 14 to 16 cycles respectively. The reinforcement in the EVERDURE CALTITE specimen, on the other hand, remained passive throughout the test. This indicating that chlorides had not been able to penetrate the cover thickness during the test period. Fig.3

National University of Singapore

Experiments were conducted at the National University of Singapore comparing penetrability characteristics of concrete with a water/cementitious ratio of 0.4 containing a wide range of admixtures and additives from four separate suppliers.

Figure 4 summarises the pressure penetration and absorption results for silica fume, polypropylene fibre and hydrophobic concretes compared with those for the reference concretes.

EVERDURE CALTITE concrete was found to have, by far, the lowest pressure penetration value obtained. The absorption tests showed only EVERDURE CALTITE profoundly reduces absorption compared with the reference concretes. Fig.4

University of Liverpool A storage barn for road de-icing salt near Nottingham, U.K. was constructed using prestressed concrete panels incorporating EVERDURE CALTITE in all but two controls. The University of Liverpool is monitoring the concrete's performance. Strengths of over 80 N/mm² were achieved at 28 days for both concrete. In spite of the obvious quality of the control, Figure 1 shows that concrete containing EVERDURE CALTITE (HPI) was far less permeable to both air and water and had a higher electrical resistivity.		Fig.1
Queen's University Queen's University of Belfast examined concretes modified with 10% and 20% silica fume and EVERDURE CALTITE using various in-situ test procedures. The results for concretes with a water/cementitious ratio of 0.4 are given in Figure 2. EVERDURE CALTITE was found to be more effective in reducing surface abrasion and permeability than silica fume, the latter by a factor of ten compared with the control. EVERDURE CALTITE gave comparable compressive strength to the control while somewhat improving tensile strength.		Fig.2
University of Surrey A time-to-corrosion study was conducted in the Department of Civil Engineering on concretes with and without EVERDURE CALTITE. The specimens were cast with reinforcing bars at 10mm, 25mm and 40mm covers and cured for 7 days. These were subjected to one week ponding with 5% sodium chloride solution followed by one week drying, before reponding with salt solution and so on for 17 cycles. Potentials were measured with a "Saturated Calomel Electrode" (SCE). Results for 10mm covers are given in Figure 3. Reinforcement at 10mm and 25mm covers in the control were depassivated after 8 and 14 to 16 cycles respectively. The reinforcement in the EVERDURE CALTITE specimen, on the other hand, remained passive throughout the test. This indicating that chlorides had not been able to penetrate the cover thickness during the test period.		Fig.3
National University of Singapore Experiments were conducted at the National University of Singapore comparing penetrability characteristics of concrete with a water/cementitious ratio of 0.4 containing a wide range of admixtures and additives from four separate suppliers. Figure 4 summarises the pressure penetration and absorption results for silica fume, polypropylene fibre and hydrophobic concretes compared with those for the reference concretes. EVERDURE CALTITE concrete was found to have, by far, the lowest pressure penetration value obtained. The absorption tests showed only EVERDURE CALTITE profoundly reduces absorption compared with the reference concretes.		Fig.4