Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of Dry Lime Sludge on the Physico-mechanical and Microstructural Properties of Low Carbon Cementitious Composites Exposed at Elevated Temperature
Although cement mortar is a non-combustible material, but high temperatures exhibit negative effects on the mechanical properties of mortar. The aim of the presented study is to investigate the impact of the range of elevated temperature exposure (from 200 °C ± 15 °C to 800 °C ± 15 °C) on the physico-mechanical and microstructural properties of chemically activated lime sludge (CALS) mortar. The primary raw materials to prepare CALS mortar, were a few industrial waste such as—dry lime sludge powder waste, fly ash along with 6 mm coarse aggregates, river sand as fine aggregates, chemical activator (sodium hydroxide and hydrogen peroxide), and chemical admixture. CALS mortar specimens were cast, cured at ambient temperature at 27 °C ± 3 °C, and tested at a curing age of 28 days. To determine a fixed optimized water-cement (w/c) ratio, a workability test of CALS mortar was conducted using flow table test for all twenty mix-proportions. The test samples were subjected to the exposure of an elevated temperature of 45 °C ± 3 °C, 200 °C ± 5 °C, 400 °C ± 5 °C, 600 °C ± 5 °C, and 800 °C ± 5 °C consecutively at a heating rate of 8 °C/min, for a time duration of four hours in the programmable high-temperature furnace. The results showed that the temperature does not affect the mechanical property of mortar up to 45 °C. But as the temperature was reached at 200 °C ± 5 °C or more, 28 days compressive strength of all the mortar specimens was decreased. Bulk dry density and weight were decreased by 25 and 30%, respectively. The porosity and water absorption were increased by 20 and 22%, respectively, after heated the specimen at 800 °C ± 5 °C. Field emission-scanning electron microscope (FE-SEM) study revealed that the CALS mortar matrix was denser as compared to the control specimen, i.e. without replacement of fine aggregate with lime sludge. The use of lime sludge as replacement of fine aggregate will not only contribute to sustainable development goals but also cost reduction of lime sludge incorporated cementitious composites such as mortar and concrete will provide the solution for low-cost housing in the infrastructural development.
Influence of Dry Lime Sludge on the Physico-mechanical and Microstructural Properties of Low Carbon Cementitious Composites Exposed at Elevated Temperature
Although cement mortar is a non-combustible material, but high temperatures exhibit negative effects on the mechanical properties of mortar. The aim of the presented study is to investigate the impact of the range of elevated temperature exposure (from 200 °C ± 15 °C to 800 °C ± 15 °C) on the physico-mechanical and microstructural properties of chemically activated lime sludge (CALS) mortar. The primary raw materials to prepare CALS mortar, were a few industrial waste such as—dry lime sludge powder waste, fly ash along with 6 mm coarse aggregates, river sand as fine aggregates, chemical activator (sodium hydroxide and hydrogen peroxide), and chemical admixture. CALS mortar specimens were cast, cured at ambient temperature at 27 °C ± 3 °C, and tested at a curing age of 28 days. To determine a fixed optimized water-cement (w/c) ratio, a workability test of CALS mortar was conducted using flow table test for all twenty mix-proportions. The test samples were subjected to the exposure of an elevated temperature of 45 °C ± 3 °C, 200 °C ± 5 °C, 400 °C ± 5 °C, 600 °C ± 5 °C, and 800 °C ± 5 °C consecutively at a heating rate of 8 °C/min, for a time duration of four hours in the programmable high-temperature furnace. The results showed that the temperature does not affect the mechanical property of mortar up to 45 °C. But as the temperature was reached at 200 °C ± 5 °C or more, 28 days compressive strength of all the mortar specimens was decreased. Bulk dry density and weight were decreased by 25 and 30%, respectively. The porosity and water absorption were increased by 20 and 22%, respectively, after heated the specimen at 800 °C ± 5 °C. Field emission-scanning electron microscope (FE-SEM) study revealed that the CALS mortar matrix was denser as compared to the control specimen, i.e. without replacement of fine aggregate with lime sludge. The use of lime sludge as replacement of fine aggregate will not only contribute to sustainable development goals but also cost reduction of lime sludge incorporated cementitious composites such as mortar and concrete will provide the solution for low-cost housing in the infrastructural development.
Influence of Dry Lime Sludge on the Physico-mechanical and Microstructural Properties of Low Carbon Cementitious Composites Exposed at Elevated Temperature
Lecture Notes in Civil Engineering
Saha, Suman (Herausgeber:in) / Sajith, A. S. (Herausgeber:in) / Sahoo, Dipti Ranjan (Herausgeber:in) / Sarkar, Pradip (Herausgeber:in) / Sharma, Chandra Shekhar (Autor:in) / Kumar, Rajesh (Autor:in)
05.10.2022
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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