Scrutinizing the Effect of Water Temperature on the Compressive Strength of Recycled Concrete

Dadang Iskandar, Ida Hadijah, Sigit P. Hadiwardoyo, Novia Lumintu Wati, Septyanto Kurniawan

Research output: Contribution to journalArticlepeer-review


After demolishing rigid roads and old buildings, concrete is often rendered worthless and thrashed as waste. Currently, sustainable concrete construction is very popular, and the goal of the industry is to protect the population’s well-being by reducing CO2 emissions and encouraging the effective use of natural resources. One of the causes of decreased quality of recycled products is the adherence of cement paste to concrete demolition. Therefore, this study aims to examine the effect of water temperature on the compressive strength of recycled concrete. This is carried out with the hope that water temperature can impact the disintegration of the cement paste in the demolition concrete, thereby strengthening the bond between aggregates. The water temperature applied in this study was 25oC, 60oC, and 100oC, while the levels of recycled concrete aggregate (RCA) used were 25%, 50%, and 80%. The results showed that the highest compressive strength was obtained with an average of 26.23 MPa at a water temperature of 25oC and 25% RCA. However, this value is still below the composition of the natural aggregate, which is 28.6 MPa. Due to the rapid hydration caused by the high-water temperature, the process of forming concrete on the surface is accelerated while the interior remains weak. This situation affects the weakening of the compressive strength of concrete. Furthermore, this study shows that high water temperatures are beneficial for the cement paste decay process in recycled aggregates, but it is best to use a normal temperature of 25oC when mixing the water.

Original languageEnglish
Pages (from-to)1668-1678
Number of pages11
JournalCivil Engineering and Architecture
Issue number4
Publication statusPublished - Jul 2023


  • Compressive Strength
  • Recycled Concrete
  • Sustainability
  • Water Temperature


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