Journal of Materials and Engineering Structures
Volume 12, Numéro 4, Pages 555-570
2025-12-30

Mechanical And Microstructural Properties Of High Strength Concrete With Manufactured Sand And Recycled Coarse Aggregates



Authors : Kasilingam Senthil . Sharma Rachit .

Abstract

The influence of manufactured sand (M-sand) and Recycled Coarse Aggregates (RCA) on the fresh, mechanical and microstructural properties in the high strength concrete is focused in order to promote sustainable materials in the high strength concrete. Therefore, there are four proposed mixes such as conventional concrete, RCA replaced by 25% coarse aggregate, MS replaced by river sand 100% and combination of MS (100%) and RCA (25%) replaced together are designated as CM, RC, MS and MSRC, respectively. The proposed mixes were evaluated through the mechanical tests such as compression and tension tests as well as the microstructural analysis such as microstructure as well as elements and phase formations through the SEM, XRD and EDX analysis. It was concluded that the inclusion of RCA and M-sand in concrete has reduced the workability because of their higher water absorption capacity. The compressive strength of mix RC and MS was reduced by 12.9 and 8.24%, respectively as compared to CM. Also, the compressive strength of mix MSRC was reduced by 13.3% compared to the control mix. It was observed that the tensile strength of mix RC and MS individually was reduced by 7.7 and 7.17%, whereas the same on mix MSRC was further reduced by 16% as compared to mix CM. The microstructure of the MS was relatively denser as compared to the RC, however the microstructure of mix MSRC was found to be weaker due to untreated silica particles present in the interface of mortar as compared to the control mix CM. The CM mix revealed that the brownmillerite and calcite act as an activator in the early hydration of concrete and as an inert filler. The RC mix mostly showed the presence of quartz and small peaks of hatrurite and the mineral phase on MS mix has strong peaks of quartz and albite, whereas the mineral phases in MSRC show both hatrurite and albite along with quartz are the hydration products of C3S. The presence of higher Sulphur content in a mix of RC, MS and MSRC also indicates lower durability to water penetration and brittle microstructure.

Keywords

High Strength Concrete ; Manufactured Sand ; Recycled Coarse Aggregate ; Microstructure

Les articles similaires

Effect Of Coarse Recycled Concrete Aggregate On The Microstructural And Durability Properties Of Self Compacting Concrete

Kumar Dinesh .  Rao V.v.l. Kanta .  Lakshmy P. . 
pages 155-166.

Parent Concrete Quality Of Recycled Concrete Aggregates On Some Engineering Properties Of Concrete

Benmiloud Houssam Eddine .  Adjoudj M’hamed .  Ezziane Karim .  Kadri El Hadj . 
pages 299-315.

Physical And Mechanical Properties Of Concrete With Partial Replacement Of Coarse Aggregates By Coconut Shells And Reinforced With Coconut Fibre

Mandal Bharat .  Tiwari Sushant .  Ghimire Subid .  Tiwari Aasish . 
pages 227-238.

Aggregate Packing Density Approach For Sustainable Scc Using Un-processed Coarse Recycled Concrete Aggregates

Kumar Dinesh .  Kanta Rao V.v.l .  Lakshmy P. . 
pages 233-244.

Sustainable Development Of High-volume Fly Ash Self-compacting Concrete Incorporating Bottom Ash And Recycled Concrete Aggregates

Meena Amardeep .  Singh Navdeep .  Singh S.p. . 
pages 615-630.

Formats de citation