scholarly journals The effects of waste glass cullets and nanosilica on the long-term properties of cement mortars

2018 ◽  
Vol 49 ◽  
pp. 00102 ◽  
Author(s):  
Katarzyna Skoczylas ◽  
Teresa Rucińska
Keyword(s):  
Mechanical Properties ◽  
Beneficial Effect ◽  
Construction Industry ◽  
Adhesive Strength ◽  
Drying Shrinkage ◽  
Waste Glass ◽  
Curing Conditions ◽  
Freeze Thaw ◽  
Cement Mortars

This study presents experimental results on the effects of nanosilica and waste glass cullets on the long-term mechanical properties and durability of cement mortars. Three groups of cement mortars were prepared, where natural aggregate was replaced in 0% (R), 50% (RWG) and 100% (WG) with waste glass cullets by volume. Each group was modified with the nanosilica admixture by 0%, 1% and 3% by the weight of cement. Furthermore, superplasticizer was incorporated in order to improve the workability of mortars. Subsequently to the preparation and curing of specimens, mechanical properties after 7, 28 and 365 days, freeze-thaw resistance, adhesive strength, abrasion resistance, and drying shrinkage (in two types of curing conditions) were evaluated. The results confirmed the applicability of waste glass in the construction industry as well as the beneficial effect of nanosilica on the mechanical properties of mortars.

Study on Strength, Shrinkage and Creep of Concrete Containing Ultrafine Fly Ash Composites

2012 ◽  
Vol 450-451 ◽  
pp. 162-167
Author(s):  
Bao Ju Liu ◽  
You Jun Xie
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Drying Shrinkage ◽  
Experimental Results ◽  
Steam Curing ◽  
Curing Conditions ◽  
Shrinkage And Creep

At steam curing and moist curing conditions, the mechanical properties of concrete with different fineness and different proportions ultrafine fly ash-slag composite were studied. The experimental results indicated that the addition of ultrafine fly ash-slag composite had improved the long term mechanical properties of steam-cured concrete. The concrete with ultrafine fly ash-slag composite has lower drying shrinkage and creep compared to that of control concrete.

scholarly journals Mechanical Properties and Drying Shrinkage Investigation of Alkali-Activated Mortar Using Waste Glass Powder

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Jianqing Gong ◽  
Zhigang Qu
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Bp Neural Network ◽  
Glass Powder ◽  
Drying Shrinkage ◽  
Waste Glass ◽  
Waste Glass Powder ◽  
Glass Recycling ◽  
Recycled Waste ◽  
Alkali Activated

Alkali-activated mortar (AAM) is one of the products of waste glass recycling that exhibits promising potential for wide engineering applications such as the construction industry. In this study, recycled waste glass powder-based additives, namely, Silica Fume (SF) and Nano-SiO2 (NS), were investigated for their potential to enhance the mechanical properties (strength) and drying-shrinkage resistance of AAM. The results indicated that 5.0% and 1.5% were the optimum SF and NS dosages, respectively, for optimizing AAM performance in terms of the compressive strength, flexural strength, and drying-shrinkage resistance. A prediction model, based on backpropagation (BP) neural network analysis, was also satisfactorily formulated and preliminarily validated for predicting the drying shrinkage of AAM containing SF or NS.

scholarly journals Long-Term Physical and Mechanical Properties and Microstructures of Fly-Ash-Based Geopolymer Composite Incorporating Carbide Slag

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6692
Author(s):  
Xianhui Zhao ◽  
Haoyu Wang ◽  
Linlin Jiang ◽  
Lingchao Meng ◽  
Boyu Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Room Temperature ◽  
Physical And Mechanical Properties ◽  
Drying Shrinkage ◽  
Fine Aggregate ◽  
Property Development ◽  
Industrial Solid Waste ◽  
Carbide Slag

The long-term property development of fly ash (FA)-based geopolymer (FA−GEO) incorporating industrial solid waste carbide slag (CS) for up to 360 d is still unclear. The objective of this study was to investigate the fresh, physical, and mechanical properties and microstructures of FA−GEO composites with CS and to evaluate the effects of CS when the composites were cured for 360 d. FA−GEO composites with CS were manufactured using FA (as an aluminosilicate precursor), CS (as a calcium additive), NaOH solution (as an alkali activator), and standard sand (as a fine aggregate). The fresh property and long-term physical properties were measured, including fluidity, bulk density, porosity, and drying shrinkage. The flexural and compressive strengths at 60 d and 360 d were tested. Furthermore, the microstructures and gel products were characterized by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). The results show that the additional 20.0% CS reduces the fluidity and increases the conductivity of FA−GEO composites. Bulk densities were decreased, porosities were increased, and drying shrinkages were decreased as the CS content was increased from 0.0% to 20.0% at 360 d. Room temperature is a better curing condition to obtain a higher long-term mechanical strength. The addition of 20.0% CS is more beneficial to the improvement of long-term flexural strength and toughness at room temperature. The gel products in CS−FA−GEO with 20.0% CS are mainly determined as the mixtures of sodium aluminosilicate (N−A−S−H) gel and calcium silicate hydration (C−S−H) gel, besides the surficial pan-alkali. The research results provide an experimental basis for the reuse of CS in various scenarios.

scholarly journals Durability of a New Aerogel Cement-Based Rendering System under Distinct Accelerated Aging Conditions

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5413
Author(s):  
Joana Maia ◽  
Marco Pedroso ◽  
Nuno M. M. Ramos ◽  
Inês Flores-Colen ◽  
Pedro F. Pereira ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Liquid Water ◽  
Adhesive Strength ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Accelerated Aging ◽  
Widespread Application ◽  
Freeze Thaw ◽  
The Matrix ◽  
Aging Conditions

The widespread application of innovative thermal enhanced façade solutions requires an adequate durability evaluation. The present work intends to assess the durability of a new aerogel cement-based rendering system through the adaptation of different accelerated aging cycles, such as heating–freezing, freeze–thawing, and heat–cold. Several mechanical properties and also capillary and liquid water absorptions were tested for uncoated and coated specimens. A decrease in the mechanical strength, especially after freeze–thaw cycles, was observed. However, the water action promoted the late hydration of the cement paste contributing to the densification of the matrix and, consequently, the increase of the adhesive strength. Additionally, a decrease in the dynamic modulus of elasticity and an increase in the Poisson’s ratio were observed after aging, which indicates a higher capacity of the render to adapt to substrate movements, contributing to a reduction of cracking.

Fluid Transport Mechanisms in Portland Cement Mortar Modified with PVA and Nano Montmorillonite

2013 ◽  
Vol 687 ◽  
pp. 311-315 ◽  
Author(s):  
Teresa María Piqué ◽  
Luis Fernandez Luco ◽  
Analía Vázquez
Keyword(s):  
Tensile Strength ◽  
Portland Cement ◽  
Construction Industry ◽  
Fluid Transport ◽  
Cement Mortar ◽  
Drying Shrinkage ◽  
Cement Matrix ◽  
Poly Vinyl Alcohol ◽  
Cement Mortars ◽  
Compressive And Flexural Strengths

The development of new materials for specific applications is an increasing field in the construction industry, so is the employment of nanotechnology for this goal. When poly(vinyl alcohol) (PVA) is added to a Portland cement mortar, a film is formed in between the hydration products. This film has low elasticity modulus and high tensile strength and it enhances the mortar’s mechanical properties in the fresh and hardened states. The addition of nano montmorillonites (MMT) gives the polymer a better compatibility with the cement matrix. In this work, the changes in the microstructure of Portland cement mortars modified with PVA and PVA with MMT are assessed by means of transport of fluids capacity as an indicator. The reference is a standard mortar according to EN 196-1. The parameters measured are: weight loss under drying and air permeability. Complementary measures, such as compressive and flexural strengths and drying shrinkage have also been performed. From the obtained results, it can be concluded that the inclusion PVA + MMT to Portland cement mortar doesn’t affect the microstructure, when compared with Portland cement mortar with PVA, and even increase its tensile strength.

scholarly journals Influence of Storage Conditions and Corrosive Environments on the Mechanical Properties of GFRP Rebars

2018 ◽  
Vol 14 (2) ◽  
pp. 86-90
Author(s):  
Andrey Benin ◽  
Ekaterina Bogdanova
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Experimental Studies ◽  
Storage Conditions ◽  
Manufacturing Plants ◽  
Long Term Storage ◽  
Corrosive Environments ◽  
Gfrp Rebars ◽  
Term Storage

AbstractA trend of applying composite reinforcement in construction industry has been growing in Russia recently: hence, new manufacturing plants have appeared and the volume of sales has increased. However there were not enough experimental studies of the polymer reinforcement chemical stability and the influence of various factors (climate, corrosive environments, nonstationary loading, etc.) on the strength of structures reinforced with polymer rebars. The objective of this investigation was to identify the influence of long-term storage conditions and exposure to corrosive environment (i.e. 5 % NaCl solution) produced on the mechanical properties of GFRP rebars.

scholarly journals Effects of resins on mechanical performance of polymer concrete

2021 ◽  
Vol 73 (10) ◽  
pp. 995-1006
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Mechanical Performance ◽  
Unsaturated Polyester ◽  
Polymer Concrete ◽  
Hardened Concrete ◽  
Polyester Resins ◽  
Cement Manufacturing ◽  
Carbon Dioxide Co2

Cement manufacturing is currently responsible for one of the highest levels of carbon dioxide (CO2) emissions and energy consumption in construction industry. Thus, the use of sustainable binder materials instead of cement has become a worldwide issue. Previous studies have shown that polymers are a reliable and sustainable alternative to cement in construction, while polymer concretes (PCs) are seen as the biggest alternative to conventional cement concretes in the long term. In this study, the main objective is to investigate the effects of resins, which are used as binder components in polymer concrete, on the mechanical properties of the PCs. To achieve this, ten different orthophthalic unsaturated polyester resins (OUPR) that are commonly used in construction industry are considered, and fresh concrete tests and hardened concrete tests are performed on deck plates prepared with these resins. Based on the analysis results, each resin is given a performance index. The experimental results indicate that the type of resin has a significant impact on mechanical properties of polymer concrete.

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