scholarly journals Machine-Learning-Aided Prediction of Flexural Strength and ASR Expansion for Waste Glass Cementitious Composite

2021 ◽  
Vol 11 (15) ◽  
pp. 6686
Author(s):  
Junbo Sun ◽  
Yufei Wang ◽  
Xupei Yao ◽  
Zhenhua Ren ◽  
Genbao Zhang ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Glass Powder ◽  
Correlation Coefficients ◽  
Waste Glass ◽  
Data Sets ◽  
Activation Effect ◽  
Supplementary Cementitious Material ◽  
Expansion Test ◽  
Essential Properties ◽  
Sensitive Variable

Waste glass (WG) is unsustainable due to its nonbiodegradable property. However, its main ingredient is silicon dioxide, which can be utilised as a supplementary cementitious material. Before reusing WG, the flexural strength (FS) and alkali–silica reaction (ASR) expansion of WG concrete are two essential properties that must be investigated. This study produced mortar containing activated glass powder using mechanical, chemical, and mechanical–chemical (combined) approaches. The results showed that mortar containing 30% WG powder using the combined method was optimal for improving the FS and mitigating the ASR expansion. The microstructure analysis was implemented to explore the activation effect on the glass powder and mortar. Moreover, a random forest (RF) model was proposed with hyperparameters tuned by beetle antennae search (BAS), aiming at predicting FS and ASR expansion precisely. A large database was established from the experimental results based on 549 samples prepared for the FS test and 183 samples produced for the expansion test. The BAS-RF model presented high correlation coefficients for both FS (0.9545) and ASR (0.9416) data sets, showing much higher accuracy than multiple linear regression and logistic regression. Finally, a sensitivity analysis was conducted to rank the variables based on importance. Apart from the curing time, the particle granularity and content of WG were demonstrated to be the most sensitive variable for FS and expansion, respectively.

scholarly journals Fresh, Mechanical Properties and Impact Resistance Behavior of Eco-Friend Self-Compacted Concrete

2019 ◽  
Vol 22 (3) ◽  
pp. 208-212
Author(s):  
Sheelan M. Hama ◽  
Alhareth M. Abdulghafor ◽  
Mohammed Tarrad Nawar
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Polyethylene Terephthalate ◽  
Glass Powder ◽  
Impact Resistance ◽  
Waste Glass ◽  
Slump Flow ◽  
Waste Glass Powder ◽  
Self Compact Concrete

In this work, waste glass powder from broken windows and plastic fibers from waste polyethylene terephthalate bottles are utilized to produce an economical self-compact concrete. Fresh properties (slump flow diameter, slump Flow T50, V. Funnel, L–Box), mechanical properties (Compressive strength and Flexural strength) and impact resistance of self-compact concrete are investigated. 15% waste glass powder as a partial replacement of cement with five percentages of polyethylene terephthalate plastic waste were adopted: 0% (reference), 0.5%, 0.75%, 1%, 1.25% and 1.5% by volume. It seems that the flow ability of self-compact concrete decreases with the increasing of the amount of plastic fibers. The compressive strength was increased slightly with plastic fiber content up to (0.75%), about 4.6% For more than (0.75%) plastic fiber. The compressive strength began to decrease about 15.2%. The results showed an improvement in flexural strength and an impact on the resistance in all tested specimens’ content of the plastic fibers, especially at (1.5%) fibers.

scholarly journals EVALUATION OF THE INFLUENCE OF WASTE GLASS POWDER (WGP) ON THE THERMO-MECHANICAL PERFORMANCE OF FIRED CERAMICS

2020 ◽  
Vol 26 (3) ◽  
pp. 84-94
Author(s):  
Adeolu Adediran ◽  
Abayomi Akinwande ◽  
Oluwatosin Balogun ◽  
Oladele Bello ◽  
Abel Barnabas ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Cooling Rate ◽  
Glass Powder ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Operating Temperature ◽  
Impact Resistance ◽  
Waste Glass ◽  
Waste Glass Powder ◽  
Shock Resistance

Effects of elevated temperature on thermo-mechanical properties of fired ceramic products reinforced with waste glass powder (WGP) were reported. Samples were produced by the addition of WGP to clay in varied amount and oven dried samples were fired in an electric furnace which was operated 1200 oC. Compressive and flexural strength were examined at room temperature and at elevated temperatures of 100, 300, 500, 700, and 900 oC. Results showed that, compressive strength and flexural strength reduced at elevated temperatures. Thermal conductivity, diffusivity, and emissivity were higher with increasing WGP content, while thermal expansivity and specific heat capacity were lower as percentage WGP increased in the samples. Results on thermal shock resistance showed that WGP reduced shock resistance in the samples, while the cooling rate increased with the percentage addition of WGP. Impact resistance was noted to decrease in samples when fast cooled from high temperature as the rapid cooling rate was observed to increase with WGP addition in samples. It was concluded that for fired clay products incorporated with WGP, the operating temperature should not exceed 700 oC. Also, in an environment whereby cooling is done by air or/and water, an operating temperature of ≤ 300 oC was recommended.

Properties of Alkali-Activated Waste Glass-Cement Cementitious Materials

2018 ◽  
Vol 926 ◽  
pp. 134-139 ◽  
Author(s):  
Wen Juan Yao ◽  
Lei Fan ◽  
Guang Yan Liu
Keyword(s):  
Glass Powder ◽  
Chemical Activation ◽  
Cementitious Materials ◽  
Waste Glass ◽  
Curing Time ◽  
Hydration Products ◽  
Activation Effect ◽  
Engineering Construction ◽  
Pozzolanic Reactivity ◽  
Waste Glass Powder

The hydration products, microstructure and development principle of intensity of cement-glass powder cementitious materials acted in alkali and activation effect of chemical activation on waste glass powder were investigated. The principle of intensity and effect of curing time was analyzed by changing alkali type, content of alkali, incorporation of glass powder, incorporation method of activators and other factor. The result shows that: sodium carbonate and sodium silicate can single stimulate activity of glass powder under a certain condition, the activated effect of combined admixture is superior to the effect on single-doped activator, under the action of an excitation agent, surface hydrolysis of glass powder takes place on the glass body first and the hydration products occurs, The pozzolanic reactivity of glass powder increases gradually and generated a larger amount of hydration products，which has lapped and interlocked growth between each other，and form the compact hardened matrix. In addiation, the shorting of curing time is used by activator, the result may be lead to initial curing and against in engineering construction.

scholarly journals Development of Environment-Friendly Concrete through Partial Addition of Waste Glass Powder (WGP) as Cement Replacement

2020 ◽  
Vol 6 (12) ◽  
pp. 2332-2343
Author(s):  
Fasih Ahmed Khan ◽  
Khan Shahzada ◽  
Qazi Sami Ullah ◽  
Muhammad Fahim ◽  
Sajjad Wali Khan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Glass Powder ◽  
Waste Glass ◽  
Modulus Of Rupture ◽  
Partial Replacement ◽  
Supplementary Cementitious Material ◽  
Beam Elements ◽  
Pozzolanic Material ◽  
Waste Glass Powder ◽  
Study Results

This paper presents the study carried out on the utilization of Waste Glass Powder (WGP) as supplementary cementitious material in concrete. The evaluation of the influence of WGP on the mechanical properties of concrete was carried out by casting and testing of concrete samples as per ASTM standards (cylinders and beam elements). The control samples were designed to represent field conditions with a target compressive strength of 20,000 kPa. The Portland cement in concrete was substituted with WGP in proportions of 0%-35% by weight, in increments of 5%. Two curing domains were adopted in the preparation of the test samples to evaluate the effect of pozzolanic material wherein the tested samples were cured for 28, 56, and 84 days. The study results indicated a reduction in compressive strength of concrete up to 10% with partial replacement of cement with 25% of WGP when standard curing of 28 days was adopted. Furthermore, with the same replacement proportion and prolonged curing for 84 days, the gap in strength reduction was reduced by 5%. However, a significant decrease in workability was noted between the control concrete samples and glass powder infused concrete. Furthermore, the Waste Glass Powder Concrete (WGPC) exhibited an improved flexural strength with the modulus of rupture for WGPC being 2% higher than control concrete at the age of 84 days. Based on the results of this study it was concluded that 25% replacement of cement with WGP provides an optimum replacement ratio. Doi: 10.28991/cej-2020-03091620 Full Text: PDF

scholarly journals Utilization of Waste Glass Powder in Cement Mortar

2021 ◽  
Vol 9 (1) ◽  
pp. 25
Author(s):  
Džigita Nagrockienė ◽  
Kęstutis Barkauskas
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Glass Powder ◽  
Physical And Mechanical Properties ◽  
Cement Industry ◽  
Waste Glass ◽  
Regression Equations ◽  
Test Results ◽  
Waste Glass Powder ◽  
Cement Mortars

Every year, millions of tons of waste glass are generated all over the world and disposed in landfills. Utilization of this waste by substituting a certain share of cement in cement mortars can contribute to the reduction of environmental pollution in two aspects: the utilization of waste and the reduction of the cement content in cement-based mortars. The cement industry is responsible for approximately 6% of global CO2 emissions. Seven different mortar mixes, containing between 0% and 30% of waste glass powder added by weight of cement, were analyzed. The following physical and mechanical properties of the mortar mixes were measured: compressive strength, flexural strength, and density. The test results revealed that waste glass powder can be used in small amounts in cement-based mortars to reduce the amount of cement and to utilize waste glass. A higher performance, modified cement-based mortar can be produced for civil engineering applications by replacing 5% with waste glass powder. The linear regression equations obtained illustrate the relationships between the density and compressive strength, and between density and flexural strength at 28 days.

INVESTIGATION OF USING WASTE GLASS POWDER AS A SUPPLEMENTARY CEMENTITIOUS MATERIAL IN REACTIVE POWDER CONCRETE

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Shatha Hasan ◽  
Doaa Nayyef
Keyword(s):  
Compressive Strength ◽  
Glass Powder ◽  
Waste Glass ◽  
Reactive Powder Concrete ◽  
Concrete Aggregate ◽  
Supplementary Cementitious Material ◽  
Recycled Glass ◽  
Waste Glass Powder ◽  
Reactive Powder ◽  
Direct Tensile

Some mechanical behaviors were tested by investigations of compressive strength, and direct tensile, strength of reactive Powder concrete (RPC) containing recycled glass powder (RGP) as a supplementary, cementitious material. This study goals to survey the pozzolanic activity of recycled glass powder (RGP) up to (30%) silica fume replacement and its effect on the properties of recycled reactive powder concrete (RRPC) that made by waste glass (WG) and recycled fine concrete aggregate, which has not been investigated before. These properties contain compressive strength and direct tensile strength. Glass is principally composed of silica so that when waste glass is grind to micro particle size in RPC as a partial replacement of silica fume could be a substantial step to development of sustainable material. In this study, high strength reactive powder concrete (HSRPC) with mean compressive strength of 118.4 MPa at 28 days slightly decreased when 40% recycled fine concrete aggregate were used then the strength evolve afterward when 20% of waste glass powder WGP was utilized. The strength tests outcomes indicated that waste glass powder gave greater strength compared to ordinary reactive powder concrete.

Sign in / Sign up

Export Citation Format

Share Document