scholarly journals The influence of cement-based composite materials on the performance of bridges: modification and optimization by nano-SiO2 material

2020 ◽  
Vol 15 (3) ◽  
pp. 409-413
Author(s):  
Cheng Zhu
Keyword(s):  
Compressive Strength ◽  
Composite Materials ◽  
Flexural Strength ◽  
Building Materials ◽  
Complex Environments ◽  
Nano Sio2 ◽  
Bending Resistance ◽  
Cement Based Materials ◽  
Different Content ◽  
Compression Resistance

Abstract Cement-based materials have been widely used in bridge construction. In order to further improve their performance, this study analyzed the modification and optimization functions of nano-SiO2 materials, designed test specimens with different content of nano-SiO2 and conducted experiments on their flow performance, compression resistance, bending resistance and impermeability. The results showed that the flow performance of the materials decreased and the impermeability decreased with the increase of nano-SiO2 content. The compressive strength and flexural strength are the best when the content of nano-SiO2 is 1%. On the whole, the best content of nano-SiO2 is 1%; when the content of nano-SiO2 is 1%, all the properties of the specimens are good, which is more conducive to the construction of bridges in various complex environments. The research in this paper has made some contributions to the further application of nano-SiO2 in the optimization of building materials, which is conducive to the better development of building materials.

scholarly journals Flow Mechanism and Strength Characteristics of Textile Reinforced Concrete Mixed with Colloidal Nano-SiO2

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ping Xu ◽  
Rui Shi ◽  
Chao Wang ◽  
Yuhao Cui ◽  
Minxia Zhang
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
Silica Fume ◽  
Inhibitory Effect ◽  
Equal Mass ◽  
Textile Reinforced Concrete ◽  
Nano Sio2 ◽  
Four Point Bending ◽  
Concrete Filling

In order to develop textile reinforced concrete (TRC) with good flowability and strength, colloidal nano-SiO2 (CNS) is adopted to improve the performance of TRC. The flowability, compressive strength, flexural strength, and four-point bending tests of TRC matrix with CNS are carried out, and the changes of internal micromorphological characteristics of TRC matrix are analyzed by combining with scanning electron microscopy. The results show that the CNS has an inhibitory effect on the flowability of TRC matrix, and the greater the amount of admixture is, the smaller the slump expansion of TRC matrix is. The compressive strength and flexural strength of TRC matrix show a trend of increasing and then decreasing as the amount of CNS increases, and the compressive strength reaches the maximum at each age (7 d, 14 d, 28 d) when CNS and silica fume replace 5% cement by 1 : 4 equal mass. The flexural strength reaches the maximum at each age (7 d, 14 d, 28 d) when 5% cement is replaced by CNS and silica fume with 3 : 7 equal mass. The flexural strength increases with the increase of CNS admixture. It is found by electron microscope scanning that the incorporation of CNS consumes more Ca(OH)2, refines the Ca(OH)2 crystal size, and generates more C-S-H gels. These C-S-H gels are distributed in a net-like pattern inside the concrete, filling the internal pores, effectively densifying the interfacial transition zone between the cementitious material and the aggregates, and optimizing the internal structure.

scholarly journals Effect of nano CaCO3 on durability of concrete

2020 ◽  
Vol 165 ◽  
pp. 03029
Author(s):  
Jiangong Yang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Test Data ◽  
Building Materials ◽  
Strength Test ◽  
Practical Application ◽  
Compressive Strength Test ◽  
Different Content ◽  
Durability Of Concrete

Through comparatively analyzing the impermeability and compressive strength test data of nano CaCO3 concrete with different content, this paper puts forward the method of optimizing the durability of nano CaCO3 concrete, and studies the influence of the content of fly ash on the durability of nano CaCO3 concrete on this basis, so as to provide a reference for improving the durability of concrete, so as to improve the recycling and reusing efficiency of building materials, and accelerate the practical application of nano CaCO3 concrete in engineering.

scholarly journals Crossover Effect in Cement-Based Materials: A Review

2019 ◽  
Vol 9 (14) ◽  
pp. 2776 ◽  
Author(s):  
Sumra Yousuf ◽  
Payam Shafigh ◽  
Zainah Ibrahim ◽  
Huzaifa Hashim ◽  
Mohammad Panjehpour
Keyword(s):  
Compressive Strength ◽  
Construction Industry ◽  
Building Materials ◽  
Cement Hydration ◽  
Curing Temperature ◽  
Future Research ◽  
Hydration Products ◽  
Crossover Effect ◽  
Cement Based Materials ◽  
Mineral Compositions

Cement-based materials (CBMs) such as pastes, mortars and concretes are the most frequently used building materials in the present construction industry. Cement hydration, along with the resulting compressive strength in these materials, is dependent on curing temperature, methods and duration. A concrete subjected to an initial higher curing temperature undergoes accelerated hydration by resulting in non-uniform scattering of the hydration products and consequently creating a great porosity at later ages. This phenomenon is called crossover effect (COE). The COE may occur even at early ages between seven to 10 days for Portland cements with various mineral compositions. Compressive strength and other mechanical properties are important for the long life of concrete structures, so any reduction in these properties is of great concern to engineers. This study aims to review existing information on COE phenomenon in CBMs and provide recommendations for future research.

High Strength and Toughness Al2O3 Composite Materials for the Improvement of Ceramic Channel in SRL Hot Dipping System

2010 ◽  
Vol 658 ◽  
pp. 416-419 ◽  
Author(s):  
Hyun Hwi Lee ◽  
Seung Ho Kim ◽  
Bhupendra Joshi ◽  
Sung Hun Cho ◽  
Soo Wohn Lee
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Composite Materials ◽  
Flexural Strength ◽  
Fracture Strength ◽  
Hot Pressing ◽  
High Strength ◽  
Economic Feasibility ◽  
Different Content ◽  
Strength And Toughness

The ceramic channel is very important in SRL hot dipping system. High strength and fracture toughness of ceramic channel materials can improve the quality, productivity and economic feasibility of zinc plated steel. The purpose of this research was to find out the most suitable conditions of the ceramic channel that have best fracture strength and fracture toughness. The hot pressed composite materials was carried out by hot pressing Al2O3 with different content of ZrO2. The composite contained from 0-20 wt.% ZrO2. Hot pressed composite materials were observed for mechanical properties (density, hardness, fracture toughness and flexural strength) and microstructure.

Research on the Strengthening Effect of Phosphorus Slag Powder on Cement-Based Materials

2009 ◽  
Vol 405-406 ◽  
pp. 356-360 ◽  
Author(s):  
Dong Mei Liu ◽  
Kun He Fang ◽  
Hua Shan Yang
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Cement Hydration ◽  
Hydration Product ◽  
Strengthening Effect ◽  
Early Hydration ◽  
Double Excitation ◽  
Slag Powder ◽  
Cement Mortars ◽  
Cement Based Materials

The strengthening effect of phosphorus slag powder (PSP) in cement-based materials was researched by model of strengthening effect of mineral admixes, and the mechanism of strengthening effect of PSP was also studied by SEM. The results indicate that, in early hydration period, the strengthening effect of PSP on strength of cement mortars is zero. At 90 days, strengthening effect has been exerted, and increases with the amount of PSP when that is no more than 40%, but decreases with larger content of PSP. At 180 days, the strengthening effect was further enhanced, the greater the amount of PSP, the greater its effect. For compressive strength of cement mortars, the strengthening effect of PSP is more than that of PSP on flexural strength. The results analyses of SEM show that, strengthening effect of PSP mainly come from its pozzolana reaction. With double excitation of cement hydration product hydroxide and gypsum, the low alkalinity C-S-H was produced.

Effect of Carbon Nanotubes on Mechanical Properties of Cement Composites

2014 ◽  
Vol 915-916 ◽  
pp. 768-771
Author(s):  
Yun Feng Li ◽  
Jing Zhou ◽  
Lei Wen Gao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Brittle Failure ◽  
Cement Composites ◽  
Toughness Index ◽  
Different Content ◽  
Positive Effect

Nanotubes exhibiting great mechanical properties are expected to produce significantly stronger and tougher cement composites. The effects of Carbon Nanotubes to cement based composites are investigated in this paper. The flexural strength and the compressive strength of the CNTs cement composites under different content of are tested and the toughness indexes are analyzed. The results show that CNTs have a positive effect on the brittle failure of cement composites, and that the compressive strength and flexural strength of 0.10% CNTs cement composites are significantly increased. The toughness index of 0.05% CNTs cement composites is relatively higher.

scholarly journals A Study on Mechanical Properties of Conventional Concrete and Coconut Shell Concrete by Replacing Cement with Silica Fume

2018 ◽  
Vol 7 (2.12) ◽  
pp. 437
Author(s):  
V R.Prasath Kumar ◽  
K Gunasekaran ◽  
Sreerag K P
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Silica Fume ◽  
Building Materials ◽  
Coarse Aggregate ◽  
Coconut Shell ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Coconut Shells

High standing estimation of building materials utilized for development is a component of incredible concern. Coconut shell as a completely substitution in the place of coarse aggregate may totally effective for designers in construction industry. The coconut shell concrete is a light weight solid which may decrease the self-heap of a structure. The under taken project depends on inspecting attributes of coconut shell concrete when contrasted with conventional concrete. Coconut shells going from 10mm strainer and held on 6.3mm were considered to utilize for this study. For the current study M100 grade concrete is used to cast the specimens. The principle properties considered testing on coconut shell concrete and conventional concrete is compressive strength, split tensile strength and flexural strength. Examples were taken by supplanting coarse aggregate with coconut shells completely and cement is supplanted by silica fume with various extents of 5%, 10%, 15%, 20%, 25% for compressive strength test and tests were done at 3, 7, 28, 56 and 90 days of curing, it is observed that the ideal compressive strength outcomes were obtained at 10% of silica fume. The flexural strength and  split tensile strength of the specimens are calculated with replacement of cement by silica fume with  different extents of 0%, 5%, 10% and 15%, tests were done at 3, 7 and 28 days of curing. The optimum replacement percentage of cement by silica fume is 10% for compressive strength, split tensile and flexural strength. The primary principle is to lessen the utilization of natural aggregate by supplanting them with coconut shells and to decrease the density of concrete which makes concrete for simple dealing.  

scholarly journals COMPOSITE MATERIALS MODIFIERS BASED ON CEMENT

2021 ◽  
Author(s):  
З.З. Аларханова ◽  
Д. К-С. Батаев
Keyword(s):  
Composite Materials ◽  
Mechanism Of Action ◽  
Building Materials ◽  
Melamine Formaldehyde ◽  
Cement Based Materials

В статье рассмотрено одно из основных направлений развития наноинженерии строительных материалов. Модификация композиционных материалов на основе цемента поликарбоксилатами. Рассмотрены особенности механизма действия поликарбоксилатных суперпластификаторов на свойства бетона в сравнении с традиционными пластифицирующими добавками на основе сульфированных нафталини или меламинформальдегидных соединений. Представлены перспективы развития наноинженерии в модификации материалов на основе цемента. The article discusses one of the main directions of development of nanoengineering of building materials. Modification of cement-based composite materials with polycarboxylates. The features of the mechanism of action of polycarboxylate superplasticizers on the properties of concrete are considered in comparison with traditional plasticizing additives based on sulfonated naphthalene- and or melamine-formaldehyde compounds. Prospects for the development of nanoengineering in the modification of cement-based materials are presented.

Researches on Properties of Polymer Modified Rapid Hardening Sulphoaluminate Cement Repair Mortar

2010 ◽  
Vol 168-170 ◽  
pp. 1767-1771
Author(s):  
Wei Zhao ◽  
Dong Xu Li ◽  
Qing Hai Li ◽  
Zhi Xin Wang
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Silica Fume ◽  
Cellulose Ether ◽  
Rubber Powder ◽  
Repair Mortar ◽  
Orthogonal Experiments ◽  
Economical Benefit ◽  
Mixed Mortar ◽  
Different Content

The effects of different content of rubber powder, silica fume, cellulose ether, dihydrate gypsum, water reducing agent , defoamer on the dry-mixed mortar were studied according to orthogonal experiments. The results show that the compressive strength of 1 d is up to 38.4 MPa and the flexural strength to 6.4 MPa. Therefore the super-high mortar studied is mainly used for rush repairing engineering. It has great economical benefit and society benefit.

scholarly journals Mechanical properties of the gypsum composite reinforcement with wooden fibers

2019 ◽  
Vol 10 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Markéta Hošťálková ◽  
Nikola Vavřínová ◽  
Veronika Longauerová
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Shear Strength ◽  
Flexural Strength ◽  
Physical Properties ◽  
Building Materials ◽  
Strength Properties ◽  
Physical Parameters ◽  
Fibrous Materials ◽  
Mechanical And Physical Properties

The gypsum is one of the most often used materials in the civil engineering. Very often it is applied in the form of plasterboards without any reinforcement, for example, cladding boards are unusable as supporting construction. To improve the mechanical properties of plasterboards, fibrous materials such as cellulose or glass fiber are added. Reinforcement of gypsum with fibers improves in particular the flexural and shear strength. The main purpose of the research is to clarify whether natural wooden fibers could be used as the reinforced of composite gypsum building materials. Wooden fibers are used as a blown or board thermal insulation. This article presents the results of tests aimed at determining the mechanical and physical properties of gypsum composite reinforced with wooden fibers. The effect of the reinforcement on the strength properties as a compressive strength, flexural strength was verified on a series of test specimens. The results of the tests have shown that the reinforcing of gypsum composite has an impact on the mechanical-physical parameters.

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