1,720,991 research outputs found
Natural fiber as a fibrous reinforced in polymer modified mortar : a review / Azamuddin Husin, Mahyuddin Ramli and Cheah Chee Ban
Full text linkThe disadvantages of cement based material are due to its brittleness, thus perform low tensile strength and poor fracture toughness. This poor performance can be improved by using fiber as reinforcement. Fiber such as carbon fiber, glass fiber is widely used to enhance the properties of the cement-based material, especially in the form of thin sheet/plates. While global scenario has intensively moved towards green buildings, it is possible to use our local resources. It is to innovate local green building materials such as using natural fiber from agricultural waste such as oil palm fiber, coir fiber, kenaf and wood fiber. Therefore, this paper highlights the review of the literature regarding the use of natural fiber in polymer-modified mortar
Mechanical properties of hybrid fibres reinforced polymer modified mortar in promoting sustainable materials in construction / Azamuddin Husin, Mahyuddin Ramli and Cheah Chee Ban
Full text linkFibre reinforced polymer modified mortar (PMM) was widely accepted for multipurpose application in construction industry. However the use of natural fibre in cementitious material in terms of durability performance was not encouraging. This paper aims to investigate the mechanical properties of the hybrid fibre namely kenaf, polypropylene and bar chip in polymer modified mortar with a low water-cement ratio. The results concluded that the hybridisation of 0.4% kenaf, 0.6% polypropylene and 0.6% bar chip (G sample) exhibited the significant increment of compressive and flexural strength for both curing regimes
Durability properties of ternary blended flowable high performance concrete containing ground granulated blast furnace slag and pulverized fuel ash
No full textThe use of ordinary Portland cement as the primary binder in concrete
production resulted in the high carbon footprint of the concrete material which
cause a great deal of environmental impacts over the years. The consumption
of OPC is especially significant for high strength concrete, which require a very
high cement content (more than 450 kg/m3). Hence, supplementary
cementitious materials such as ground granulated blast furnace slag (GGBS) and
pulverized fuel ash (PFA) were chosen as partial replacement materials of OPC
for concrete production in the research due to their ease of availability from the
steelmaking manufacturing sectors and coal-fired electricity power stations in
the country. As the sustainability of concrete is also our main concern, the
durability performance of flowable high performance concrete containing high
volume of GGBS and PFA (50-80% replacement of OPC) has been studied in this
research. Therefore, the durability properties of flowable high performance
concrete had been assessed in term of air permeability, porosity, water
absorption and capillary action. From the results of assessment, all ternary
blended concrete mixes exhibited better durability performances than control
OPC concrete at later ages due to formation of denser microstructure by
pozzolanic reaction of GGBS and PFA. It is concluded that the mix proportion of
flowable high performance concrete production with 60% replacement of OPC
by GGBS and PFA has the optimum durability performances than OPC concret
The effect of Isoprenyl Ether polymer molecular structure on cementitious composites
No full textIn order to minimize the rapid flow loss issue from the hot weather or during lengthy periods and long-distance transport, the synthesis of the isoprenyl oxy polyethylene ether (T-PEG) was introduced. However, there were scarce amount of reported literature on the influence of main and side chain densities on the fresh and hardened properties of concrete containing T-PEG polymers. This study was conducted to investigate fresh and mechanical properties of cementitious composites containing T-PEG polymers with different main and side chain densities. These T-PEG polymers were comprised of the density ratio of side chain to main chain of 1:1, 1:1.5, 1:2, 1:2.5 and 1:3.5, respectively. The laboratory tests conducted were marsh cone funnel test, standard consistency, flow retention, flexural strength and compressive strength test. The results obtained showed that the increased density ratio of side chain to main chain of T-PEG improves the fluidity of the cement paste and the flow retention ability of the cement mortar. Consequently, the mortar with T2 polymer proved a better performance on mechanical strength tests. In conclusion, the increasing main to side chain densities ratio of T-PEG polymer imposes a significant influence on the fresh and hardened properties of the concrete material produced
The mechanical strength and drying shrinkage behavior of high performance concrete with blended mineral admixture
No full textWith the fast in population development, there are a higher demand in housing and infrastructure such as high-rise buildings and long-span bridges. Therefore, high performance concrete (HPC) is used massively due to its technical and economical advantages to fulfil people demands towards the concrete usage. Optimum mineral blended admixture replacement ratio with the addition of superplasticizer are the main component which contributed to the formation of HPC in terms of high workability, high strength and high durability. Hence, the optimal cement to blended mineral admixture ratio with the optimum addition of PCE type superplasticizer to achieve the targeted mechanical strength performance of G60 and reduce the drying shrinkage behavior which will results in crack of the ternary blended concrete is highlighted in this report. The influence of the addition of two mineral blended admixture, ground granulated blast furnace slag (GGBS) and pulverized fly ash (PFA) with the ordinary Portland cement (OPC) in different ratio on engineering performance and its drying shrinkage behavior in the age of 7 days, 28 days and 90 days based on different mineral blended admixture replacement level in 50%, 60%, 70% and 80% which GGBS to PFA ratio are controlled in 4:1 and the water to cement ratio was kept in 0.35 is studied. There are two types of PCE type superplasticizer (SP) was added to enhance the workability of the fresh concrete and act as slump retainer. Ternary blended concrete results in low early age (7 days) strength but the performance at later age (28 days and beyond) was encouraging. Results revealed that 80% replacement level have the remarkable result in terms of mechanical strength and drying shrinkage behavior. The study showed that, presence of mineral additives with superplasticizer will produce a similar or enhance the concrete strength properties with the inclusion of GGBS and PFA at the ratio of 4:1 up to 80% as cement replacement
INNOVATION IN GREEN TECHNOLOGY - USM CONTINUES TO DRIVE SUSTAINABILITY
Full text linkSUNGAI PETANI, KEDAH, 1 February 2017 – Being a sustainability-led university, Universiti Sains
Malaysia (USM) continues its drive for excellence in sustainable practices by introducing the
cementless concrete with a low carbon footprint, which is ready for commercialisation. It is the
research outcome using green technology by a lecturer from USM School of Housing, Building and
Planning (HBP), Dr. Cheah Chee Ban
INOVASI TEKNOLOGI HIJAU - USM TERUS PACU KECEMERLANGAN KELESTARIAN
Full text linkSUNGAI PETANI, KEDAH, 1 Februari 2017 - Universiti memimpin Kelestarian, Universiti Sains Malaysia
(USM) terus memacu kecemerlangan dalam bidang kelestarian apabila produk penyelidikan
menggunakan teknologi hijau oleh pensyarah dari Pusat Pengajian Perumahan Bangunan dan
Perancangan (HBP), Dr. Cheah Chee Ban iaitu konkrit tanpa simen rendah jejak karbon sedia untuk
dikomersialkan
The geopolymerization hydration kinetics governing the solidification of coal and wood biomass ash cementless Concrete.
No full textThe activation of the Class F coal fly ash using the rubber wood ash is anticipated to produce a stable geopolymer binder matrix which is dimensionally and mechanically stable for used a primary binder of concrete.The reaction mechanism of the hydrated rubber wood ash-coal fly ash paste was examined using FTIR, TGA and SEM-EDX assessment
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