Application Performance of Aminosulphonic Acid-Based Superplasticizer

2012 ◽  
Vol 268-270 ◽  
pp. 811-817
Author(s):  
Feng Wei He ◽  
Tong Lui ◽  
Ya Qin Zhang
Keyword(s):  
Cement Paste ◽  
Mechanical Performance ◽  
Fresh Concrete ◽  
Low Cost ◽  
Rate Adaptation ◽  
Application Performance ◽  
Reducing Ability ◽  
Highly Effective ◽  
Effective Water

The effects of aminosulphonic acid-based Superplasticizer(ASP)on the fluidity of cement paste and harden perfomance and mechanical performance of fresh concrete are studied.The water reducing rate, adaptation to cements and compatibility with naphthalene-based water reducer of ASP are tested. Teating results indicated that in comparison with naphthalene-based water reducer, ASP has the characteristics of low cost, highly effective water reducing ability and the ability restraining slump loss, and also has excellent adaptation to cements and good compatibility with naphthalene-based water reducer.

Printing ultrathin graphene oxide nanofiltration membranes for water purification

2017 ◽  
Vol 5 (39) ◽  
pp. 20860-20866 ◽  
Author(s):  
Mahdi Fathizadeh ◽  
Huynh Ngoc Tien ◽  
Konstantin Khivantsev ◽  
Jung-Tsai Chen ◽  
Miao Yu
Keyword(s):  
Graphene Oxide ◽  
Water Purification ◽  
Inkjet Printing ◽  
Low Cost ◽  
Nanofiltration Membranes ◽  
Highly Effective ◽  
First Time ◽  
Polymeric Supports ◽  
Effective Water

We demonstrated for the first time that inkjet printing can be a low-cost, easy, fast, and scalable method for depositing ultrathin (7.5–60 nm) uniform graphene oxide (GO) nanofiltration membranes on polymeric supports for highly effective water purification.

scholarly journals Effect of Natural Graphite Fineness on the Performance and Electrical Conductivity of Cement Paste Mixes for Self-Sensing Structures

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5833
Author(s):  
Ioanna Papanikolaou ◽  
Chrysoula Litina ◽  
Amir Zomorodian ◽  
Abir Al-Tabbaa
Keyword(s):  
Electrical Conductivity ◽  
Cement Paste ◽  
Mechanical Performance ◽  
Low Cost ◽  
Construction Materials ◽  
Natural Graphite ◽  
Cement Pastes ◽  
Conductive Additive ◽  
Frequent Monitoring ◽  
Wide Availability

Cementitious composites are the most widely used construction materials; however, their poor durability necessitates frequent monitoring and repairs. The emergence of self-sensing composites could reduce the need for costly and time-consuming structural inspections. Natural graphite, due to its low cost and wide availability, is a promising additive to generate an electrically conductive network which could ultimately lead to a self-sensing mechanism. Despite several studies using natural graphite as a conductive additive, the effect of its fineness on the cementitious composite’s performance has not been explored. This study experimentally investigated the effect of three graphite products of varying fineness on the early age, mechanical, and electrical conductivity performance of cement pastes. The fluidity of the graphite-cement paste reduced significantly with increasing graphite fineness, and graphite did not affect the cement hydration. The finer the graphite, the lower the effect on the mechanical performance, as confirmed by compressive strength testing and micro-indentation. Electrical conductivity testing showed that the percolation threshold depended on the graphite fineness and was found at ~20 wt % for the fine and medium graphite, while it increased to 30–40 wt % for the coarse graphite. This is the first study that has investigated holistically the effect of graphite fineness on the performance of cement pastes and will pave the way for using this material as an additive for self-sensing structures.

scholarly journals Upcycling of Vine Shoots: Production of Fillers for PHBV-Based Biocomposite Applications

2020 ◽  
Author(s):  
Grégoire David ◽  
Laurent Heux ◽  
Stéphanie Pradeau ◽  
Nathalie Gontard ◽  
Hélène Angellier-Coussy
Keyword(s):  
Water Vapor ◽  
Gas Phase ◽  
Mechanical Performance ◽  
Low Cost ◽  
Water Vapor Permeability ◽  
Contact Angles ◽  
Vapor Permeability ◽  
Water Contact ◽  
Median Diameter ◽  
Cost Of Materials

Abstract This paper aims at investigating the potential of vine shoots (ViSh) upcycling as fillers in novel poly(3-hydroxybutyrate-3-hydroxyvalerate) (PHBV) based biocomposites. ViSh particles of around 50 µm (apparent median diameter) were obtained combining dry grinding processes, and mixed with PHBV using melt extrusion. Thermal stability and elongation at break of biocomposites were reduced with increasing contents of ViSh particles (10, 20 and 30 wt%), while Young’s modulus and water vapor permeability were increased. It was shown that a surface gas-phase esterification allowed to significantly increase the hydrophobicity of ViSh particles (increase of water contact angles from 59° to 114°), leading to a reduction of 27% in the water vapor permeability of the biocomposite filled with 30 wt% of ViSh. The overall mechanical performance was not impacted by gas-phase esterification, demonstrating that the interfacial adhesion between the virgin ViSh particles and the PHBV matrix was already good and that such filler surface treatment was not required in that case. It was concluded that ViSh particles can be interestingly used as low cost fillers in PHBV-based biocomposites to decrease the overall cost of materials.

Holey graphene nanosheets: large-scale rapid preparation and their application toward highly-effective water cleaning

Nanoscale ◽  
2014 ◽  
Vol 6 (20) ◽  
pp. 11659-11663 ◽  
Author(s):  
Zhicai Xing ◽  
Jingqi Tian ◽  
Qian Liu ◽  
Abdullah M. Asiri ◽  
Ping Jiang ◽  
...  
Keyword(s):  
Large Scale ◽  
Graphene Nanosheets ◽  
Rapid Preparation ◽  
Water Cleaning ◽  
Highly Effective ◽  
Effective Water

Highly Effective, Water-Soluble, Hemocompatible 1,3-Propylene Oxide-Based Antimicrobials: Poly[(3,3-quaternary/PEG)-copolyoxetanes]

2011 ◽  
Vol 12 (3) ◽  
pp. 757-769 ◽  
Author(s):  
Souvik Chakrabarty ◽  
Allison King ◽  
Pinar Kurt ◽  
Wei Zhang ◽  
Dennis E. Ohman ◽  
...  
Keyword(s):  
Propylene Oxide ◽  
Water Soluble ◽  
Highly Effective ◽  
Effective Water

scholarly journals 5-fluorouracil modulated by leucovorin, methotrexate and mitomycin: highly effective, low-cost chemotherapy for advanced colorectal cancer

2001 ◽  
Vol 84 (8) ◽  
pp. 1023-1028 ◽  
Author(s):  
A Sobrero ◽  
A Guglielmi ◽  
M Cirillo ◽  
E Recaldin ◽  
G L Frassineti ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Advanced Colorectal Cancer ◽  
Low Cost ◽  
Highly Effective

Potential use of waste from tree pruning and recovered plastic to obtain a building material: Case study of Merida, Mexico

2020 ◽  
Vol 38 (11) ◽  
pp. 1222-1230
Author(s):  
Ricardo Herbé Cruz-Estrada ◽  
Javier Guillén-Mallette ◽  
Carlos Vidal Cupul-Manzano ◽  
Josué Iván Balam-Hernández
Keyword(s):  
Building Material ◽  
Mechanical Performance ◽  
Low Cost ◽  
Weight Ratio ◽  
Plastic Composite ◽  
Trees And Shrubs ◽  
Tree Pruning ◽  
Potential Use ◽  
Better Than

This work presents a study on the use of wood and plastic wastes generated in abundance in Merida, Mexico, to help to reduce them in order to mitigate environmental deterioration. The use of these wastes is proposed to obtain a low-cost building material. So, the escalation process (i.e., extrusion) at the pilot level to obtain a prototype of a wood–plastic composite (WPC) corrugated sheet to evaluate the technical feasibility to make a low-cost product is reported. A corrugated sheet with recycled high-density polyethylene (R-HDPE) was produced. The R-HDPE was collected from Merida’s Separation Plant. The wood came from the trimmings of different varieties of trees and shrubs that are periodically pruned. WPC sheets with virgin HDPE were prepared to assess its effect on the materials’ mechanical performance. The wood/HDPE weight ratio was 40/60. The performance of the WPC sheets was compared with that of commercial products with similar characteristics, namely acrylic and polyester sheets reinforced with fibreglass, and black asphalt-saturated cardboard sheets. Thus, the effect of natural weathering on the maximum tensile tearing force and on the maximum flexural load of the different types of sheets was evaluated. Although the mechanical performance of the WPC sheets was lower than that of the acrylic and polyacrylic sheets, their performance was much better than that of the cheap black asphalt-saturated cardboard sheets. So, they are a good option to be used as low-cost temporary roofing.

scholarly journals Prefabricated Urban Underground Utility Tunnels: A Case Study on Mechanical Behaviour with Strain Monitoring and Numerical Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yonggang Xiao ◽  
Jubing Zhang ◽  
Jie Cao ◽  
Changhong Li
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Low Cost ◽  
Side Wall ◽  
Operating Conditions ◽  
Land Occupation ◽  
Depth Analysis ◽  
Simulation Results

The prefabricated urban utility tunnels (UUTs) have many advantages such as short construction period, low cost, high quality, and small land occupation. However, there is still a lack of in-depth analysis of the mechanical performance of the prefabricated urban utility tunnel (UUT) structure with bolted connections under different working conditions. In this paper, the force performance of a prefabricated UUT in Tongzhou District, Beijing, was studied under different working conditions using two methods: field monitoring and numerical simulation. The multichannel strain monitor was used for monitoring, and the internal wall concrete and bolt strain change data under the two conditions of installation and backfill were obtained. Combined with the construction process of the UUTs, a three-dimensional numerical model was established by COMSOL, where the build-in bolt assembly was used to simulate the longitudinal connection of the tunnel. The simulation results were compared with the measured data to verify the rationality of the computational model. The simulation results showed that the concrete and bolts on the inner wall of the tunnel work well under the two conditions of installation and backfilling; The deformation of the top plate of the prefabricated tunnel was approximately parabolic, with the largest vertical displacement (0.37 mm) in the middle and the most sensitive to the vertical load in the central part of the roof. The central portion of the side wall had the largest displacement (0.17 mm) in the inner concave. The tensile stress of bolt 3 increased the most (30.75 MPa) but was still much smaller than the yield strength of the bolt. The concrete and bolts of the UUT were found to work well through force analysis under operating conditions. In conclusion, analysis of structural forces and deformation failure modes will help design engineers understand the basic mechanisms and select the appropriate UUT structure.

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