A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sustainable lean concrete mixes containing wastes originating from roads and industries
https://orcid.org/0000-0002-3993-739X
Graphical abstract Display Omitted
Highlights Use of RAP for Dry Lean Concrete mixes is a sustainable approach. SCM when included in absence of cement reduced the properties of RAP-DLC mixes. SCM when included in excess of cement enhanced the properties of RAP-DLC mixes. RAP mix with 50% extra cement achieved the recommended strength for DLC subbase. RAP mix with 30% extra cement & 20% flyash is economical and feasible for subbase.
Abstract Scarcity of natural aggregates and illegal dumping of wastes originating from roads and industries are the major challenges for a developing country. The present study is an effort to provide a sustainable solution to the aforementioned challenges by utilizing these wastes for production of subbase course of concrete pavements. In the study, the optimum proportion of reclaimed asphalt pavement (RAP) along with the optimum proportion of the various supplementary cementitious admixtures (SCM) such as flyash (FA), silica fume (SF) and sugarcane bagasse ash (BA) have been evaluated for productions of dry lean concrete (DLC) mixes. The effect of the higher amount of Portland cement on the properties of RAP inclusive DLC mixes was also investigated. It was observed that the hardened properties of DLC containing RAP are mostly depended upon the maximum dry density of the fresh mixtures. Inclusions of considered industrial waste, as part replacement of Portland cement, were found to have an insignificant effect, whereas, when included in excess of cement, enhanced the properties of RAP-DLC blends significantly. The results of the study depicted that the suitability of RAP aggregates for DLC subbase may be increased by increasing the cement content by about 50%, whereas, for achieving the comparable performance to that of DLC containing natural aggregates, the quantity of cement shall be doubled. Based on the results of different parts of the study, it is recommended to include at least 30% extra cement content with either of 10% SF or 20% FA for sustainable DLC mixtures containing 75% coarse RAP aggregates.
Sustainable lean concrete mixes containing wastes originating from roads and industries
https://orcid.org/0000-0002-3993-739X
Graphical abstract Display Omitted
Highlights Use of RAP for Dry Lean Concrete mixes is a sustainable approach. SCM when included in absence of cement reduced the properties of RAP-DLC mixes. SCM when included in excess of cement enhanced the properties of RAP-DLC mixes. RAP mix with 50% extra cement achieved the recommended strength for DLC subbase. RAP mix with 30% extra cement & 20% flyash is economical and feasible for subbase.
Abstract Scarcity of natural aggregates and illegal dumping of wastes originating from roads and industries are the major challenges for a developing country. The present study is an effort to provide a sustainable solution to the aforementioned challenges by utilizing these wastes for production of subbase course of concrete pavements. In the study, the optimum proportion of reclaimed asphalt pavement (RAP) along with the optimum proportion of the various supplementary cementitious admixtures (SCM) such as flyash (FA), silica fume (SF) and sugarcane bagasse ash (BA) have been evaluated for productions of dry lean concrete (DLC) mixes. The effect of the higher amount of Portland cement on the properties of RAP inclusive DLC mixes was also investigated. It was observed that the hardened properties of DLC containing RAP are mostly depended upon the maximum dry density of the fresh mixtures. Inclusions of considered industrial waste, as part replacement of Portland cement, were found to have an insignificant effect, whereas, when included in excess of cement, enhanced the properties of RAP-DLC blends significantly. The results of the study depicted that the suitability of RAP aggregates for DLC subbase may be increased by increasing the cement content by about 50%, whereas, for achieving the comparable performance to that of DLC containing natural aggregates, the quantity of cement shall be doubled. Based on the results of different parts of the study, it is recommended to include at least 30% extra cement content with either of 10% SF or 20% FA for sustainable DLC mixtures containing 75% coarse RAP aggregates.
Sustainable lean concrete mixes containing wastes originating from roads and industries
https://orcid.org/0000-0002-3993-739X
Graphical abstract Display Omitted
Highlights Use of RAP for Dry Lean Concrete mixes is a sustainable approach. SCM when included in absence of cement reduced the properties of RAP-DLC mixes. SCM when included in excess of cement enhanced the properties of RAP-DLC mixes. RAP mix with 50% extra cement achieved the recommended strength for DLC subbase. RAP mix with 30% extra cement & 20% flyash is economical and feasible for subbase.
Abstract Scarcity of natural aggregates and illegal dumping of wastes originating from roads and industries are the major challenges for a developing country. The present study is an effort to provide a sustainable solution to the aforementioned challenges by utilizing these wastes for production of subbase course of concrete pavements. In the study, the optimum proportion of reclaimed asphalt pavement (RAP) along with the optimum proportion of the various supplementary cementitious admixtures (SCM) such as flyash (FA), silica fume (SF) and sugarcane bagasse ash (BA) have been evaluated for productions of dry lean concrete (DLC) mixes. The effect of the higher amount of Portland cement on the properties of RAP inclusive DLC mixes was also investigated. It was observed that the hardened properties of DLC containing RAP are mostly depended upon the maximum dry density of the fresh mixtures. Inclusions of considered industrial waste, as part replacement of Portland cement, were found to have an insignificant effect, whereas, when included in excess of cement, enhanced the properties of RAP-DLC blends significantly. The results of the study depicted that the suitability of RAP aggregates for DLC subbase may be increased by increasing the cement content by about 50%, whereas, for achieving the comparable performance to that of DLC containing natural aggregates, the quantity of cement shall be doubled. Based on the results of different parts of the study, it is recommended to include at least 30% extra cement content with either of 10% SF or 20% FA for sustainable DLC mixtures containing 75% coarse RAP aggregates.
Sustainable lean concrete mixes containing wastes originating from roads and industries
Singh, Surender (author) / Ransinchung R.N., G.D. (author) / Monu, Kumari (author)
Construction and Building Materials ; 209 ; 619-630
2019-03-11
12 pages
Article (Journal)
Electronic Resource
English
100R , Mix containing 100% Reclaimed Asphalt Pavement , 10BA , Mix containing 10% Bagasse Ash , 10FA , Mix containing 10% Flyash , 10SF , Mix containing 10% Silica Fume , 15BA , Mix containing 15% Bagasse Ash , 15SF , Mix containing 15% Silica Fume , 175C , Mix containing 175 kg/m<sup>3</sup> Cement , 200C , Mix containing 200 kg/m<sup>3</sup> Cement , 20FA , Mix containing 20% Flyash , 225C , Mix containing 225 kg/m<sup>3</sup> Cement , 250C , Mix containing 250 kg/m<sup>3</sup> Cement , 25R , Mix containing 25% RAP , 300C , Mix containing 300 kg/m<sup>3</sup> Cement , 30FA , Mix containing 30% Flyash , 50R , Mix containing 50% Reclaimed Asphalt Pavement , 5BA , Mix containing 5% Bagasse Ash , 5SF , Mix containing 5% Silica Fume , 75R , Mix containing 75% Reclaimed Asphalt Pavement , ASTM , American Society for Testing and Materials , BA , Bagasse Ash , CPWD , Central Public Works Department , DLC , Dry Lean Concrete , FA , Flyash , ITZ , Interfacial Transition Zone , MDD , Maximum Dry Density , NA , Natural Aggregates , NCA , Natural Coarse Aggregates , NFA , Natural Fine Aggregates , NH , National Highway , OMC , Optimum Moisture Content , RAP , Reclaimed Asphalt Pavement , RAP-DLC , Dry Lean Concrete Mix containing Reclaimed Asphalt Pavement , RCC , Roller Compacted Concrete Pavements , SCM , Supplementary Cementitious Mineral Admixtures , SF , Silica Fume , Dry lean concrete , Bagasse ash , Silica fume
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