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Properties Of Concrete

Plastic solid waste (PSW) of polymers (like: high density polyethylene (HDPE), low density polyethylene (LDPE), Nylon etc.) is creating new challenges, which in today's scenario are major research concerns. A sharp rise has been observed in production of different products based on different plastic material. This huge increase in plastic commodities also increases the waste generation thus creating new challenges. Some researchers have reported work in the field of PSW management with different recycling methods. This paper compiles the different research work done by researchers in this field of recycling and progress in recovery and management of PSW by different methods (i.e. Primary, secondary, tertiary and quaternary) along with the various identification/separation techniques. Further, this paper reviews the effect on properties of virgin and recycled HDPE/LDPE/Nylon PSW with different reinforcements like sand, natural fibre, hemp fibre, metal powder etc.

Recycling of plastic solid waste: A state of art review and future applications

Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers

Annual Book Of Astm Standards

Supplementary cementitious materials: New sources, characterization, and performance insights

Effect of thickness on impact resistance of lightweight aggregate concrete

Nowadays, more infrastructure projects require concrete to have a high durability in addition to high strength. High strength high performance concrete (HSHPC) was developed to solve those problems. The weaknesses of HSHPC are high cost of constituent material such as silica fume which is mostly used as supplementary cementitious material (SCM), high cement content at low w/b, low workability and the need of specific curing regime. This research utilized rice husk ash (RHA) as the local waste material as an alternative to silica fume (SF). Five mixes of OPC concrete, 10%, 15% and 20% partial cement replacement by RHA, and 10% partial cement replacement by SF were chosen. The water/cementitious ratio adopted was 0.25 and the total cementitious materials content was 550 kg/m3. The mixing method adopted was the two-step mixing method. In addition to the development of compressive strength, workability, modulus of elasticity and the residue of compressive strength of concrete experienced immerse in 5% solution of magnesium sulphate were also reported. The specimens were cured and tested at 1, 3, 7, 28 and 56 days. Results show that concrete incorporating rice husk ash as 10% partial cement replacement and crushed granite as coarse aggregate with maximum size of 19 mm can achieve compressive strength as high as 110 MPa at 28 days under water curing regime. The HSHPC incorporating 10% RHA showed better overall performance than the HSHPC containing 10% silica fume and the control OPC.

Mechanical and Durability Properties of High Strength High Performance Concrete Incorporating Rice Husk Ash

The use of waste and by-product materials as aggregate or cement replacement in concrete can provide a solution to reducing the negative impact of the concrete industry. This paper reports an investigation to produce green concrete by using oil palm shell (OPS) as coarse lightweight aggregate as well as ground granulated blast furnace slag (GGBFS) as supplementary cementing material subjected to different curing conditions. Test results show that it is possible to produce green structural lightweight aggregate concrete containing 50% waste materials (by volume of concrete) with 28-day compressive strength of about 33 MPa. Data show that OPS concrete is very sensitive to curing, especially when GGBFS is used as a supplementary cementitious material.

Structural Lightweight Aggregate Concrete Containing High Volume Waste Materials

In this study, the effect of polypropylene (PP) and hybrid (PP and Steel) fibers on the fresh and hardened properties of oil palm shell (OPS) lightweight concrete was investigated. The results indicate that adding the fibers decreased the slump value while they do not affect the density of concrete. It was observed that adding fibers slightly reduced the compressive strength of concrete. However, hybrid fiber significantly improved splitting tensile and flexural strengths. OPS concrete containing PP fiber has lower initial and final water absorptions compared to control mix and OPS concrete containing hybrid fiber. In general, from the test results, it is recommended that a hybrid of PP and steel fiber is used in OPS concrete.

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Influence of Polypropylene Fiber and Hybrid Fiber on Mechanical Properties of Lightweight Concrete

Insulating interior side of external wall and finishing by cement plaster is one of the most appropriate methods of reducing annual energy consumption in available buildings. The aim of this study is to determine the optimum expanded polystyrene (EPS) and cement plaster thickness for bungalow building in Malaysia. The present study evaluates the effect of different thermal insulation and interior cement plaster thicknesses on the annual cooling energy consumption. Furthermore, the optimum thickness of EPS and plaster is estimated based on wall type and building orientation. Two different types of walls made of concrete and brick are considered. EPS and plaster were used in the range of 20 to 100 mm and 0 to 20mm, respectively. The results show that both thermal insulation and plaster thickness have a direct effect on annual cooling energy consumption, however, the influence of wall thermal insulation thickness is more significant than cement plaster thickness. Further, the optimum EPS thickness decreases with the increment in cement plaster thickness for different orientations and wall types. The optimum EPS thickness ranges from 31.5 mm to 53.1 mm based on wall type, orientation and cement plaster thickness. Utilizing optimum EPS and cement plaster thicknesses can thus reduce annual energy consumption by about 6 to 12% in different directions.

Determination of optimum insulation and cement plaster thickness for bungalow buildings through a simulation-statistical approach using response surface methodology

Payam Shafigh

Papers

Effect of thickness on impact resistance of lightweight aggregate concrete

Mechanical and Durability Properties of High Strength High Performance Concrete Incorporating Rice Husk Ash

Structural Lightweight Aggregate Concrete Containing High Volume Waste Materials

Influence of Polypropylene Fiber and Hybrid Fiber on Mechanical Properties of Lightweight Concrete

Determination of optimum insulation and cement plaster thickness for bungalow buildings through a simulation-statistical approach using response surface methodology