# Alkali-silica Reaction Elimination Potential of High-Performance Concrete Containing Glass Powder
## 3 Results
### Alkali-silica Reaction Process
Figure 1: Samples surfaces after ASR testing process according to ASTM C1260 (2020/2021): (**a**) REF HPC; (**b**) GPP HPC 50%; (**c**) GPP HPC 100%; (**d**) CWG HPC 50%; (**e**) CWG HPC 100%; (**f**) SGP HPC 50%; (**g**) SGP HPC 100%; (**h**) SGJ HPC 50%; (**i**) SGJ HPC 100%. Figure 2: _Cont._  
Figure 2: Dependence of the alkali-silica reaction process on time according to ASTMC1260 and TP137: (**a**) CWG HPC; (**b**) GPP HPC; (**c**) SGP HPC; (**d**) SGJ HPC. The CWG HPC mixtures had similar results according to both standards. All the outputs met the condition to be considered ASR innocuous materials. After 14 days, according to ASTMC1260, samples that were made from the mixture CWG HPC 50 were below 0.01%, while the values of the CWG HPC 100 mixture were around 0.02%. The results according to TP137 were measured similarly on all samples of both mixtures, around 0.05%. In all cases, after this obligation, the expansion process was stabilized, and the samples no longer showed signs of expansion. The results with the replacement of silica flour with photovoltaic glass powder differed slightly and did not confirm 100% agreement in the results. Although both mixtures were tested according to TP137 and GPP HPC 50 was tested according to ASTM C1260 showed fairly similar results, GPP HPC 100 tested according to ASTMC1260 differed and after 21 days there was a sharp increase in the expansion instead of the expected stabilization. The increased value ended up at 0.168% and pointed out the requirement of further testing. The other outputs varied from 0.068% to 0.082% and were almost stable after 14 days. The highest increasing tendency was almost identical until the 14 th day. The most diverse course was recorded in the testing of SGP HPC-type mixtures. The expansion took place in a nonstandard and diverse manner in the three measured data. Although the samples were measured according to ASTM C1260, both recorded an unusual fluctuation at 21 days and a subsequent comparison at 28 days and TP137 recorded an almost continuous increase but in diametrically different values. While SGP HPC 50 according to TP137 stabilized after only 14 days and remained almost unchanged at 0.08% until the 28 th day, SGP HPC 100 experienced a sharp increase already between the 9 th and 11 th day and increased dramatically above the safe zone. There was a stabilization at the value of 0.22%; however, after the 21 st day, growth began to appear again and continued exponentially up to the value of 0.278%. However, no cracks were still visually evident. The mixture with a 50% replacement of quartz flour according to both standards showed that the limit of 0.1% was met after 14 days; however, due to the following outputs (between 14 and 28 days), it is advisable to consider long-term tests at the same time as repeating the ones that were already carried out. In all respects, the SGJ HPC samples had very balanced and stable results (especially compared to those of the aforementioned SGP HPC). According to TP137, there was no noticeable fluctuation during the entire test period; both tested mixtures (50% and 100% replacement) remained around the value of 0.04% until the 28 th day, when the test was completed. The results were very similar for all samples of both mixtures. The test according to ASTM C1260 had a slightly more varied result but was correlated with the results according to TP137. During the testing, SGJ HPC 50 was around 0.005-0.028% with stabilization at around 0.02%, while SGJ HPC 100 was around 0.054-0.083% and due to continued moderate growth, we cannot talk about a specific stabilization value.