A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
On "Successful Design of Wet-Mix Shotcrete"
As support, test data from more than 130 shotcrete mixtures were provided, comparing 28-day compressive strength for shotcrete produced with and without alkali-free accelerator addition at the nozzle. The accelerator dosage rate (% by mass of cement) was not provided for these mixtures, other than a statement that the dosages were all within the manufacturer's recommended dosage range. There was also no mention of whether the same brand or different brands of accelerator were used. Based on the data, the article concludes: The 28-day compressive strengths of samples produced before the addition of the accelerator tend to be about 500 psi (3.45 MPa) greater than the strengths of samples produced after the addition of the accelerator. While high-performing alkali-free accelerator brands usually achieve the specified strength within the dosage rate range of 4 to 8% of the total cementitious materials content, lower performing accelerators require much higher dosage rate to achieve the same strength development rate at early ages.
On "Successful Design of Wet-Mix Shotcrete"
As support, test data from more than 130 shotcrete mixtures were provided, comparing 28-day compressive strength for shotcrete produced with and without alkali-free accelerator addition at the nozzle. The accelerator dosage rate (% by mass of cement) was not provided for these mixtures, other than a statement that the dosages were all within the manufacturer's recommended dosage range. There was also no mention of whether the same brand or different brands of accelerator were used. Based on the data, the article concludes: The 28-day compressive strengths of samples produced before the addition of the accelerator tend to be about 500 psi (3.45 MPa) greater than the strengths of samples produced after the addition of the accelerator. While high-performing alkali-free accelerator brands usually achieve the specified strength within the dosage rate range of 4 to 8% of the total cementitious materials content, lower performing accelerators require much higher dosage rate to achieve the same strength development rate at early ages.
Successful Design of Wet-Mix Shotcrete
| Online Contents | 2017
Lessons Learned from a Successful Shotcrete Repair
| British Library Conference Proceedings | 2006
Lessons Learned from a Successful Shotcrete Repair
| ASCE | 2006
| British Library Conference Proceedings | 1995