scholarly journals Some Properties of Concrete Containing Waste Brick As Partial Replacement Of Coarse Aggregate And Addition Of Nano Brick Powder

2022 ◽  
Vol 961 (1) ◽  
pp. 012093
Author(s):  
Duaa Jabbar Abdullah ◽  
Zena K Abbas ◽  
Suhair Kadhem Abed
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Coarse Aggregate ◽  
Cementitious Materials ◽  
Construction And Demolition Waste ◽  
Nano Particles ◽  
Partial Replacement ◽  
Slight Improvement ◽  
Demolition Waste ◽  
Brick Powder

Abstract The accumulation of construction and demolition waste is one of the major problems in modern construction. Hence, this research investigates the use of waste brick in concrete. Seven different concrete mixes were investigated in this study: a control concrete mix, three mixes with volumetric replacement (10, 20, and 30)% of natural aggregate with brick aggregate, and two mixes with the addition of nano brick powder at a percentage level of 5– 10% by weight of cementitious materials. And the last one was mixed with 10% nano brick and 10% coarse brick aggregate. The experimental results for the additive of nano brick powder showed an enhancement in mechanical properties (compressive, flexural, and tensile strength) compared to the control mix for all ages, while the mixes with 10% coarse brick replacement also showed a slight improvement in the mechanical properties up to 5.33%, 2.79%, and 2.38% for compressive, splitting tensile, and flexural strength, respectively, at 28 days. The nano particles modified the mechanical properties of the CBA concrete when mixed with 10% nano brick and 10% coarse brick aggregate, up to 11.54%, 8.56%, and 3.3% for compressive, flexural, and tensile strength, respectively, at 150 days.

scholarly journals Behavior of Steel Slag Concrete Subjected to Elevated Temperature

2020 ◽  
Vol 9 (4) ◽  
pp. 1165-1170
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
High Temperatures ◽  
Elevated Temperatures ◽  
Coarse Aggregate ◽  
Steel Slag ◽  
Partial Replacement ◽  
High Porosity ◽  
Residual Mechanical Properties

Recycling of materials has become a major interest for engineers. At present, the amount of slag deposited in storage yard adds up to millions of tons/year leading to the occupation of farm land and serious pollution to the environment, as a result of the rapid growth in the steel industry. Steel slag is made at 1500- 1650°C having a honey comp shape with high porosity. Using steel slag as the natural aggregate with a lower waste material cost can be considered as a good alternative for sustainable constructions. The objective of this study is to evaluate the performance of residual mechanical properties of concrete with steel slag as coarse aggregate partial replacement after exposing to high temperatures .This study investigates the behavior of using granulated slag as partial or fully coarse aggregate replacement with different percentages of 0%, 15%, 30%, 50% and 100% in concrete when subjected to elevated temperatures. Six groups of concrete mixes were prepared using various replacement percentages of slag exposed to different temperatures of 400 °C, 600 °C and 800 °C for different durations of 1hr, 1.5hr and 2hr. Evaluation tests were compressive strength, tensile strength, and bond strength. The steel slag concrete mixes showed week workability lower than control mix. A systematic increasing of almost up to 21.7% in compressive strength, and 66.2% in tensile strength with increasing the percentage of steel slag replacement to 50%. And the results showed improvement on concrete residual mechanical properties after subjected to elevated temperatures with the increase of steel slag content. The findings of this study give an overview of the effect of steel slag coarse aggregate replacement on concrete after exposed to high temperatures.

scholarly journals Feasible and Experimental Study on Partial Replacement of Fine Aggregate using Construction Debris

2020 ◽  
Vol 13 (2) ◽  
pp. 47-53
Author(s):  
Arivalagan. S ◽  
Dinesh Kumar K S A ◽  
Sudhakar R
Keyword(s):  
Construction Industry ◽  
Coarse Aggregate ◽  
Construction Material ◽  
Construction And Demolition Waste ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
River Sand ◽  
Conventional Concrete ◽  
Suitable Alternative

Concrete is the most widely used construction material today. The constituents of concrete are coarse aggregate, fine aggregate, coarse aggregate and water. Concrete plays a major role in the construction industry and a large quantum of concrete is being utilized. River sand, which isone of the constituent used in the production of conventional concrete, has become expensive and also a scarce material. In view of this,the utilization of demolished aggregate which isa waste material has been accepted as building material in many countries for the past three decades. The demand of natural sand in the construction industry has increased a lot resulting in the reduction of sources and an increase in price. Thus an increased need to identify a suitable alternative material from industrial waste in place of river sand, that is eco-friendly and inexpensive construction debris i.e fresh concrete being extensively used as an alternative to the sand in the production of concrete. There is an increase in need to find new alternative materials to replace river sand so that excess river erosion is prevented and high strength concrete is obtained at lower cost. One such material is building construction debris: a by-product obtained during construction and demolition waste. An experimental investigation is carried out on M 25 concrete containing debris during construction in the different range of 20%, 30% & 40% by weight of sand. Material was produced, tested and compared with conventional concrete in terms of workability and strength. These tests were carried out on standard cube of 150×150×150 mm and beam of 700×150×150 mm for 28 days to determine the mechanical properties of concrete.

scholarly journals A review of the effect and optimization of use of nano-TiO2 in cementitious composites

2022 ◽  
Author(s):  
Mahmud Sami Döndüren ◽  
◽  
Mohammed Gamal Al-Hagri ◽  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Setting Time ◽  
Cementitious Materials ◽  
Partial Replacement ◽  
Cementitious Composites ◽  
Nano Materials ◽  
Microstructural Properties ◽  
Nano Tio2 ◽  
Cement Based Materials

There are some problems and weaknesses related to cement-based materials, such as their very low tensile strength, low chemical resistance and the huge contribution of cement production to industrial CO2 emissions. One possible method to reduce the impacts of such problems is the partial replacement of cement in cementitious materials with nano materials. This work provides a detailed review of incorporation of one of the most widely used nano materials, namely nano-titanium dioxide, and its effect on the properties of cementitious composites. Different properties have been considered in the current study, such as fresh properties, mechanical properties (compressive strength, split tensile strength and flexural strength), durability (permeability, ultrasonic pulse velocity (UPV), electrical resistivity, carbonation resistance, freeze and thaw resistance and sulfate attack resistance) and microstructural properties. This paper also investigates the optimum content of nano-TiO2 in cement-based materials. Moreover, the cost effectiveness of use on nano-titania in cementitious composites has been discussed. Nano titania reduces the workability and setting time of cement-based materials. It can be very effective in improving the mechanical properties, durability and microstructural properties of cementitious composites.

scholarly journals Performance of Self Compacting Concrete with Partial Replacement of Coarse Aggregate with Recycled Coarse Aggregate

2019 ◽  
Vol 8 (9) ◽  
pp. 1773-1777
Keyword(s):  
Coarse Aggregate ◽  
Cement Mortar ◽  
Construction And Demolition Waste ◽  
Partial Replacement ◽  
Concrete Technology ◽  
Demolition Waste ◽  
Recycled Coarse Aggregate ◽  
Slump Flow ◽  
Mix Proportion ◽  
Fresh State

Self Compacted Concrete (SCC) is an advanced approach for the purpose of placing of concrete.It is a concrete which does not require any external force,vibration or compaction and which is highly flowable, formwork is filled without any compaction and resistance to segregation. Workability tests for SCCin fresh state are Slump-flow, L-Box, JBox,V-Box are carried out.By using recommended EFNARC guidelines the mix proportion of concrete was prepared for M40 grade concrete is 1:1.75:1.87.Water cement ratio of 0.35 is constant.In this paper Natural Coarse Aggregate(NCA) is partially replaced upto 50% with 10% interval by Recycled Coarse Aggregate(RCA).RCA is prepared by crushing of cubes which are taken from concrete technology lab. Construction and Demolition waste is also used as RCA. RCA is submerged in water for 24 hours before using for the concrete mix,this is because RCA absorbs more waterdue to adhered cement mortar to aggregate. The various tests and their results are shown in this paper.

Brick and Glass Concrete

2021 ◽  
Vol 9 (9) ◽  
pp. 1562-1570
Author(s):  
Er. Tajamul Islam
Keyword(s):  
Compressive Strength ◽  
Glass Powder ◽  
Construction And Demolition Waste ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Demolition Waste ◽  
Recycled Glass ◽  
Fine Aggregates ◽  
Brick Powder ◽  
Crushed Brick

Abstract: Glass is widely used in our lives through manufactured products such as sheet glass, bottles, glassware, and vacuum tubing. Glass is an ideal material for recycling. The use of recycled glass helps in energy saving. The recycled glass has significant contributions to the construction field for concrete production. The application of glass in architectural concrete still needs improvement. Many experiments were conducted to explore the use of waste glass as coarse and fine aggregates for both ASR (Alkali-Silica-Reaction) in concrete. The accumulation and management of construction and demolition waste, which increases along with the continuous spreading of urbanization and industrialization. Construction and demolition waste can be recycled and used as a raw material for new applications. Recycled brick aggregates recovered from demolished masonry structures can be utilized in the manufacture of new concrete mixtures. Hence, partial replacement of fine aggregate by the other compatible material like sintered fly ash, crushed rock dust, quarry dust, glass powder, recycled concrete dust, and others are being researched from the past two decades to conserve the ecological balance. additional plasticizers have been used for this project for improving their workability. In this project experimental studies on the concrete of M20 grade with partial replacement of fine aggregates by crushed brick powder (replacement by 5%, 10%, 15%,20%,30%) and crushed glass powder (replacement by 5%, 10%, 15%). The compressive strength of M20 grades of concrete at different days (3 days 7 days, 28 days) has been determined along with the measurements of workability in the slump test. The trial cubes were cast and tested at different stages. When fine aggregates are replaced by 30% crushed brick powder. The decrease in strength at the end of 28 days was found to be ranging from 22.2% and 9.81%. when fine aggregates are replaced by 20% crushed glass powder, decrease in the targeted strength at the end of 28 days was found to be ranging between 3.0%and 8.6%. The slump value was found to be decreasing in the case of crushed brick powder, while it was found increasing substantially in the case of glass of glass powder. A combination of both alternatives i.e., brick powder (20%) and glass powder (15%) were also studied and it was found that the compressive strength at the end of 28 days for M20 grade of concrete is 96.13%. Keywords: Glass powder, brick powder, workability, fine aggregate; ASR (Alkali-Silica Reaction); Compressive strength

scholarly journals Recycled Aggregate Concrete including Various Contents of Metakaolin: Mechanical Behavior

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Khaleel H. Younis ◽  
Abdulfattah A. Amin ◽  
Hemin G. Ahmed ◽  
Shelan M. Maruf
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Modulus Of Elasticity ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Demolition Waste ◽  
Aggregate Concrete ◽  
Eurocode 2

This experimental research investigates the effect of utilizing metakaolin (MK) on the behavior of recycled aggregate concrete (RAC). The RAC incorporates recycled coarse aggregate (RCA) originated from crushing construction and demolition waste. The investigated parameters were RCA and MK contents. Tests of workability and mechanical properties such as compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity were conducted to evaluate the influence of MK on workability and mechanical behavior of RAC. In total, 19 mixes were prepared. These mixes are divided into four groups. Group zero (G0) includes a reference mix containing normal coarse aggregate (NCA) and 3 mixes made with 35%, 70%, and 100% of RCA. Each one of the other three groups (G1, G2, and G3) was made with one content of the three contents of RCA, and each group includes five mixes made with the contents of 4%, 8%, 12%, 16%, and 20% of MK. Empirical models among the mechanical properties of the RAC mixes were developed and compared with models of standard codes of practice such as ACI 318, BS 8110, and Eurocode 2. It was found that MK reduces the workability of the RAC mixes. Nonetheless, the outcomes reveal that MK can improve the compressive, splitting tensile, and flexural strengths and the elastic modulus of RAC. This strength improvement enhances as the content of MK increases. The proposed models for the mechanical properties of RAC made with MK showed good correlations. The developed model for modulus of elasticity is quite close to the Eurocode 2 model, whereas the models of ACI 318 and BS 8110 underestimate the values of the modulus of elasticity.

scholarly journals The effect of recycled coarse aggregate (RCA) with surface treatment on concrete mechanical properties

2018 ◽  
Vol 195 ◽  
pp. 01017 ◽  
Author(s):  
Anggun Tri Atmajayanti ◽  
Chrisyanto Daniel Saragih G. ◽  
Yanuar Haryanto
Keyword(s):  
Mechanical Properties ◽  
Surface Treatment ◽  
Coarse Aggregate ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Demolition Waste ◽  
Split Tensile Strength ◽  
Recycled Coarse Aggregate ◽  
Concrete Mechanical Properties ◽  
Two Sides

This paper discusses the recycling system for concrete needed due to environmental and resource preservation issues. Construction and demolition waste is one problem faced in the construction site. One feasible solution to overcome this problem is by utilizing construction and demolition waste as a recycled coarse aggregate (RCA). This study aims to observe concrete mechanical properties using RCA with surface treatment. Acrylic-based material is used to treat the surface of recycled coarse aggregate (RCA) by spraying it from two sides. It is found that the recycled aggregate with surface treatment may reduce water absorption from 7.96% to 2.96%. In addition, the concrete using RCA with surface treatment may improve the compressive strength, modulus of elasticity and split tensile strength.

scholarly journals Using Eco-Friendly Recycled Powder from CDW to Prepare Strain Hardening Cementitious Composites (SHCC) and Properties Determination

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1143 ◽  
Author(s):  
Wan Wang ◽  
Huixia Wu ◽  
Zhiming Ma ◽  
Ruixue Wu
Keyword(s):  
Mechanical Properties ◽  
Strain Hardening ◽  
Ultimate Load ◽  
Cementitious Materials ◽  
Construction And Demolition Waste ◽  
Cementitious Composites ◽  
Demolition Waste ◽  
Supplementary Cementitious Material ◽  
Pva Fiber ◽  
Ultimate Displacement

Using eco-friendly recycled brick powder (RBP) derived from waste brick to prepare strain hardening cementitious composites (SHCC) provides a new way of recycling the construction and demolition waste (CDW), and the dosage of cement in SHCC can be decreased. This paper investigated the micro-properties and mechanical properties of SHCC containing RBP by a series of experiments. The results showed that RBP had typical characteristics of supplementary cementitious material (SCM). The addition of RBP increased the SiO2 content and decreased the hydration products in cementitious materials; in this case, the mechanical properties of mortar decreased with increasing RBP replacements, and a linear relationship was observed between them. It was noticed that the adverse effect of RBP on the mechanical properties decreased with increasing PVA fiber content in mortar. For SHCC containing various RBP replacements, the ultimate load increased, and the ultimate displacement decreased with increasing curing days. When using RBP to replace cement by weight, the ultimate displacement increased with the addition of RBP. Meanwhile, there was no significant reduction in the ultimate load of SHCC. When using RBP to replace fly ash (FA) by weight, the incorporation of RBP decreased the ultimate displacement of SHCC, whereas the ultimate load was improved. For example, the ultimate load and displacement of SHCC with 54%RBP were 17.6% higher and 16.4% lower, respectively, than those of SHCC with 54% FA.

scholarly journals Consistency and mechanical properties of sustainable concrete blended with brick dust waste cementitious materials

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
S. Y. Amakye ◽  
S. J. Abbey ◽  
A. O. Olubanwo
Keyword(s):  
Tensile Strength ◽  
Fresh Concrete ◽  
Environmental Benefits ◽  
Partial Replacement ◽  
Target Range ◽  
Hardened Concrete ◽  
Index Test ◽  
Demolition Waste ◽  
Concrete Mix ◽  
Brick Dust

AbstractThe reuse of waste materials in civil engineering projects has become the topic for many researchers due to their economic and environmental benefits. In this study, brick dust waste (BDW) derived from cutting of masonry bricks and demolition waste which are normally dumped as land fill is used as partial replacement of cement in a concrete mix at 10%, 20% and 30% respectively, with the aim of achieving high strength in concrete using less cement due to the environmental problems associated with the cement production. To ascertain the effects of BDW on the consistency and mechanical performance of concrete mix, laboratory investigations on the workability of fresh concrete and the strength of hardened concrete were carried out. Slump and compaction index test were carried out on fresh concrete mix and unconfined compressive strength (UCS) test and tensile strength test were conducted on hardened concrete specimen after 7, 14 and 28 days of curing. The results showed high UCS and tensile strength with the addition of 10% BDW to the concrete mix, hence achieving the set target in accordance with the relevant British standards. A gradual reduction in strength was observed as BDW content increases, however, recording good workability as slump and compaction index results fell within the set target range in accordance with relevant British standards. Findings from this study concluded that BDW can partially replace cement in a concrete mix to up to 30% igniting the path to a cleaner production of novel concrete using BDW in construction work.

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