2021 ◽  
Vol 7 (1) ◽  
pp. 30-43
Mohammad Idris Rasuli ◽  
Mitsuhiro Shigeishi ◽  
2012 ◽  
Vol 626 ◽  
pp. 776-780
Ahmad Ruslan Mohd Ridzuan ◽  
A.A. Khairulniza ◽  
M.A. Fadhil

ncreasing environmental concerns of the cement industry brings about the requirement to the development of new binders. Polymeric concrete containing no cement provides great potential in reducing the global warming problems caused by CO2emissions in Portland cement production. On the other hand, large amount of waste paper sludge ash produced annually in Malaysia has caused a disposal problem as they require a proper dumping process whereby it is very costly. The study focuses on the utilization of this high calcium Waste paper sludge ash (WPSA) in polymeric concrete containing recycled concrete aggregate (RCA). WPSA is chemically activated by a high-alkaline solution to form paste that binds aggregate in the mixture. Sodium hydroxide and sodium silicate solution are used as alkali activators of silica (Si) and aluminium (Al) in main binders. The polymeric concrete samples were exposed to external ambient condition and tested for compressive strength and shrinkage at 3, 7, 28, 56, and 90 days to identify the strength and deformation of the polymeric concrete. X-Ray Fluorescence (XRF) analysis performed to ascertain the chemical properties of the produced WPSA. The result of polymeric concrete yielded very minimum shrinkage. The measurement compressive strength is up to 7MPa at 90 days. Hence, this new green material will bring benefits to the environment and is of economical value.

2012 ◽  
Vol 626 ◽  
pp. 376-380 ◽  
Siti Shahidah Sharipudin ◽  
Ahmad Ruslan Mohd Ridzuan

In the effort to produce sustainable concrete, considerable attempt has been placed on replacing the main ingredients in concrete mixtures with more sustainable materials with the objective to reduce the carbon footprint. One of the replacement materials is waste paper sludge ash (WPSA), a local industrial by-product generated abundantly by newsprint mills which possesses considerable cementitious properties. Parallel to this, the high amount of construction waste, particularly concrete waste has become a difficult environmental issue to cope with in todays world. For this reason, recycling of concrete waste as a new alternative aggregate is being effectively utilized in concrete production. Thus, this paper reports on a study conducted to evaluate the compressive strength characteristics of the potential of using WPSA as a binder and fine recycled concrete aggregate (FRCA) as a virgin sand replacement in producing foamed concrete. The findings of this study exhibited that the inclusion of WPSA and FRCA for replacement ratios up to 20% and 15% respectively has significantly influenced the strength properties of foamed concrete.

2009 ◽  
Vol 63 (12) ◽  
pp. 1465-1469 ◽  
Yukio Tani

2012 ◽  
Vol 501 ◽  
pp. 34-38 ◽  
Kar Keng Lim ◽  
Roslinda Shamsudin ◽  
Muhammad Azmi Abdul Hamid

In this study, paper sludge ash, a waste from pulp and paper industry was used as a filler in fabricating Plaster of Paris/paper sludge ash composites. Various percentage of paper sludge ash was used, namely 1wt.%, 3wt.%, 5wt.% and 7wt.%. The effect of paper sludge ash on the compressive strength of the Plaster of Paris was studied. The mixed powder of paper sludge ash and Plaster of Paris were form into a 6 mm diameter and 12 mm height cylindrical samples. The composites were characterized theirs density where it shows that the density decreased as the amount of paper sludge ash increased. The compressive strength of the composites also decreased from 11.67 MPa without paper sludge ash addition to 0.50 MPa at 7wt.% paper sludge ash. However, the requirement of strength for Plaster of Paris in industry is between 8.96 MPa to 20.68 MPa. From the SEM observation, sample contain higher percentage of paper sludge ash exhibited more porosity. Therefore with the addition of 1wt.% of paper sludge ash into Plaster of Paris can be a promising construction material.

Shahid Bashir

Abstract: Cement production is one of the sources that emit carbon dioxide, in addition to deforestation and combustion of fossil fuels also leads to ill effects on environment. The global cement industry accounts for 7% of earth’s greenhouse gas emission. To enhance the environmental effects associated with cement manufacturing and to constantly deplore natural resources, we need to develop other binders to make the concrete industry sustainable. This work offers the option to use waste paper sludge ash as a partial replacement of cement for new concrete. In this study cement in partially replaced as 5%, 10%, 15% and 20% by waste paper sludge ash in concrete for M25 mix and tested for compressive strength, tensile strength, water absorption and dry density up to the age of 28days and compared it with conventional concrete, based on the results obtained, it is found that waste paper ash may be used as a cement replacement up to 5% by weight and the particle size is less the 90µm to prevent reduction in workability. Keywords: slump test, Compressive strength, split tensile strength, water absorption test, Waste Paper Sludge Ash Concrete, Workability.

2007 ◽  
Vol 92 (7) ◽  
pp. 1105-1111 ◽  
T. Wajima ◽  
H. Ishimoto ◽  
K. Kuzawa ◽  
K. Ito ◽  
O. Tamada ◽  

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