Durability of steel reinforced concrete in chloride environments: An overview

Tribology of electroless nickel coatings – A review

A design scheme for self-reinforced cementitious composites to be used for building-scale 3D printing processes is introduced. The design is based on that of engineered cementitious composites, which include dispersed short polymer fibers to generate robust tensile strain-hardening. The mechanical property profile of these printable ECC materials is meant to eliminate the need for steel reinforcement in printed structures, providing more freedom and efficiency for building-scale 3D printing processes. The fresh state rheological properties have been systematically manipulated to allow printability. Effects on fresh state workability of several compositional ingredients and processing parameters are investigated herein. To maintain consistent printing performance with a batch mixing approach, thixotropy in the fresh state is exploited to temporarily decouple hardening behavior from the processing timeline. Minimal workability loss under continued shear agitation is achieved. Mechanical properties of the printable materials are characterized and the printability of the materials is demonstrated.

A self-reinforced cementitious composite for building-scale 3D printing

On the rheology of using geopolymer for grouting: A comparative study with cement-based grout included fly ash and cold bonded fly ash

A scientometric review of geopolymer concrete

The experimental investigation is mainly focused on the development of cost effective high strength concrete containing high volume fly ash. Fly ash is a byproduct of coal fired electric power station. The current annual worldwide production of coal ash is estimated about 700 million tonne. Fly ash is a beneficial mineral admixture for concrete. It influences many properties of concrete in both fresh and hardened state concrete. Utilization of waste materials in cement and concrete industry reduces the environmental problems; also utilization reduces the amount of solid waste, green house gas emissions associated with Portland clinker production and conserves existing natural resources. Due to increase in demand for cement, there is a need of alternate material. Since fly ash is pozzolanic in nature, it can act as partial replacement material for Portland cement. In this study, keeping the binder content as constant and replacing cement with fly ash upto 60%, the mechanical behaviors such as compressive strength, and split tensile strength were studied. Concrete with higher percentage of fly ash (60%) attained compressive strength of 47.08 N/mm 2 and 50.50 N/mm 2 at 28 and 90 days, respectively. Further the Cost analysis was done for all the mixtures. C60 mixture concrete gives 22% savings of cost than conventional concrete.

Sustainable concrete for the construction industry

The incessant population rise entailed for an expeditious construction at competitive prices that steered the customary path to the light weight structural components. This lead to construction of structural components using ferrocement. The load bearing structural cladding, sizing 3200x900x100 mm, is chosen for the study, which, is analyzed using the software ABAQUS 6.14 in accordance with the IS:875-87 Part1, IS:875-87 Part2, ACI 549R-97, ACI 318R-08 and NZS:3101-06 Part1 standards. The Ferrocement claddings (FCs) are fabricated to a scaled dimension of 400x115x38 mm. The light weight-high strength phenomena are corroborated by incorporating Glass Fibre Reinforced Polymer Laminates (GFRPL) of thickness 6mm, engineered with the aid of hand layup (wet layup) technique wielding epoxy resin, followed by curing under room temperature. The epoxy resin is employed for fastening ferrocement cladding with the Glass fiber reinforced polymer laminate, with the contemporary methodology. The compressive load carrying capacity of the amalgamated assembly, both in presence and absence of Glass Fibre Reinforced polymer laminates (GFRPL) on either side of Ferrocement cladding, has been experimented.

https://iopscience.iop.org/article/10.1088/1755-1315/80/1/012034/pdf

A. S. Santhi

Papers

Sustainable concrete for the construction industry

Study and Behaviour of Prefabricated Composite Cladding