Innovation-ecofriendly employment of waste paper for producing lightweight aggregate for concrete

Lightweight concrete mentions to any concrete produced to an oven-dry density less than 2000 kg/m3. This can reached by replacement of natural aggregates with lightweight aggregate, no fine aggregate and or adding foamed agent to the concrete. This research usage of recycled paper as an aggregate replacement in producing a lightweight concrete for construction purpose. It was used two type of production of paper aggregate (The paper aggregate treatment with cement and paper aggregate treatment with wood glue) and then replacement with natural aggregate. The results shown increasing of replacement natural aggregate (gravel) with paper aggregate will leads to decreasing in density of concrete. The paper aggregate treatment with cement give a significant compressive strength than the concrete made with paper aggregate treatment with wood glue. Paper aggregate treatment with wood glue give a significant reduction in density than the concrete made with the paper aggregate treatment with cement. The large decreasing in splitting strength due to presence of paper when the replacement is 100% from the natural aggregate (gravel). However, the percentage of replacement 50% of paper aggregate given better splitting strength than the replacement of 100%

Mechanical Behavior of Modified Reactive Powder Concrete with Waste Materials Powder Replacement

Across the world, a huge amount of waste materials is deposited from different industrial or construction activities. Out of this massive waste quantity, a petite is recycled and remaining is dumped in vulnerable lands. This paper deals with the potential utilization of solid waste in reactive powder concrete, practically powdered glass originating from waste glass bottles and powdered ceramics tile from waste of construction process. First, the optimum ratio of waste pozzolanic material (ceramics to glass ratio) was obtained by pozzolinic activity test. Then, the optimal waste pozzolanic material was incorporated in reactive powder concrete at several substitution levels. The waste pozzolanic material in 5 %, 10 %, 15 %, 20 %, and 25 % were added in the reactive powder concrete mixes as fractional supplement of silica fume. Strength and water absorption of the modified reactive powder concrete were evaluated. A significant enhancement was observed in mechanical behavior of modified reactive powder concrete containing 15 % waste pozzolanic material. Results directed irrelevant raise in water absorption as increasing the waste replacement material. &nbsp

Accuracy of concrete strength prediction behavior in simulating punching shear behavior of flat slab using finite element approach in Abaqus

This study investigates the accuracy of prediction normal concrete behavior in simulating punching shear strength of flat slab using finite element modelling in Abaqus. The Eurocode and FIB standards were adopted to predict concrete curves for compressive and tensile stresses, in addition to two models adopted in this study based on preview expereimental stuies. Then punching shear strength of two selected flat slab specimens (with and without studs) were simulated in Abaqus to validate punching shear force vs vertical midspan displacement for the adopted experimental work. Simulation results have shown very good results in comparison to the finite element analysis (FEA) curves. Also, the test results have showed that a comparable result with various codes models (ACI-318, BS-8110, EC2, and CEB FIB model code 90)

Sustainable utilization of polyethylene terephthalate in producing local precast flooring concrete slabs

A polyethylene terephthalate plastic material is widely used in Iraq for packages manufacturing, especially for the mineral water bottles. They turn out to be waste very rapidly due to their particular short period of use. Furthermore, the recycling amount of polyethylene terephthalate bottles is considerably fewer than the sales of virgin polyethylene terephthalate manufacture for public consumptions. In the current research, the results of rupture load, water absorption and density tests implemented on precast flooring concrete slabs reinforced by fibers prepared from waste polyethylene terephthalate bottles are reported. The fibers were prepared by the simple cutting way to the bottles of carbonated beverage, and then the fibers are incorporated in the ordinary concrete mix in different volume fraction and aspect ratio. The outcomes of the rupture load and water absorption of the plastics fibers reinforced precast flooring concrete slabs exhibited apparent increase when compared with the plain precast flooring concrete slabs. This can offer the potential and practical use of the waste plastic in the development of the production of precast flooring concrete slabs