The Effect of MIRHA and Fly Ash on Mechanical Strength and Chloride Penetration Depth of DSCC

2014 ◽  
Vol 567 ◽  
pp. 522-528
Author(s):  
Muhd Fadhil Nuruddin ◽  
Kok Yung Chang ◽  
Norzaireen Mohd Azmee
Keyword(s):  
Fly Ash ◽  
Mechanical Strength ◽  
Penetration Depth ◽  
Rice Husk Ash ◽  
Chloride Penetration ◽  
Advanced Materials ◽  
Ternary Blends ◽  
Self Compacting Concrete ◽  
Chloride Permeability ◽  
Positive Effects

Ductile self-compacting concrete (DSCC) is one of the advanced materials which combines self-compacting abilities and ductility to address the current industry problems. As the fly ash and microwave incinerated rice husk ash (MIRHA) are beneficial to the properties of concrete, it has led to a research on the effects of ternary blends of MIRHA, fly ash and cement in DSCC. Up to 20% of cement in DSCC was replaced with MIRHA and fly ash with 10% by weight respectively whilst maintaining satisfactory self-compacting abilities. The effects of MIRHA and fly ash on mechanical strength and chloride penetration depth of DSCC were determined. The control DSCC mix was compared with the DSCC mix with MIRHA and fly ash. The results shown that substitution of MIRHA and fly ash into DSCC gave positive effects, it improved the mechanical properties and chloride permeability.

scholarly journals Preliminary Study on the Utilization of RHA as a Performance Enhancer for Rubber Mortar

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3216
Author(s):  
Jin Li ◽  
Peiyuan Chen ◽  
Haibing Cai ◽  
Ying Xu ◽  
Chunchao Li
Keyword(s):  
Compressive Strength ◽  
Mechanical Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Capillary Absorption ◽  
Optimal Dosage ◽  
Positive Effects ◽  
Waste Rubber ◽  
Chloride Resistance ◽  
Preliminary Study

In this study, rice husk ash (RHA) was explored as a strength enhancer for mortars containing waste rubber. The effects of RHA on the flow, mechanical strength, chloride resistance, and capillary absorption of rubber mortar were investigated by substituting up to 20% cement with RHA. The experimental results showed that the incorporation of rubber into mortar could be safely achieved by adding RHA as a cement substitute by up to 20% without compromising the compressive strength of mortar. Moreover, the RHA also exerted positive effects on the enhancement of the chloride resistance as well as the capillary absorption of rubber mortars, for which 15% RHA was found to be the optimal dosage.

scholarly journals Rheodynamic Concrete as a Progressive Viability in the field of Concrete Technology

2020 ◽  
Vol 9 (3) ◽  
pp. 319-327
Keyword(s):  
Fly Ash ◽  
Rice Husk Ash ◽  
Construction Material ◽  
Working Environment ◽  
Construction Work ◽  
Self Compacting Concrete ◽  
Concrete Technology ◽  
The World ◽  
By Products ◽  
Safe Working

The most important material which is used for the construction of any concrete structure is concrete itself. It is considered to be as a versatile construction material as its properties can be changed by various means, with the help of different elements and as and when required. Rheodynamic Concrete or Self-Compacting Concrete is a special form of concrete which can easily flow into any kind of formwork uniformly, without facing the problem of bleeding and segregation, gives a better finish, has a great characteristic of placement, requires no vibration, and thus gives a safe working environment. Due to a number of merits, this type of concrete had becoming popular in the construction work. Simultaneously, the big industries across the world are producing the by products such as fly ash, rice husk ash, etc. Thus, this paper represents a review, which is done to incorporate these wastes by – products in Self-Compacting Concrete and observe, how the different properties of the same has been modified effectively and efficiently.

Effective Utilization of Industrial and Agricultural Waste for Developing Sustainable Self-Compacting Concrete

2022 ◽  
Vol 1048 ◽  
pp. 376-386
Author(s):  
M.S. Riyana ◽  
Dhanya Sathyan ◽  
M.K. Haridharan
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Portland Cement ◽  
Rice Husk ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Cement Content ◽  
Supplementary Cementitious Materials ◽  
Ternary Blend ◽  
Self Compacting Concrete

SCC (Self compacting concrete) can fill formwork and encloses reinforcing bars under gravity and maintains homogeneity without vibration. SCC shortens the period of construction, guarantees compaction in confined zones, moreover terminates noise due to vibration. The wide spread application of SCC is restricted because of the high cost for the production of SCC with high cement content and chemical admixtures. In order to make the production of SCC economical, and to reduce the high cement content the Ordinary Portland Cement in SCC can be blended with pozzolanic materials like rice husk ash and supplementary cementitious materials like fly ash. In this paper the fresh state properties and mechanical properties such as compressive strength, split tensile strength and flexural strength of SCC with ternary blends of rice husk ash (RHA) and fly ash (FA) were studied. For this purpose, different mixes were prepared by replacing Ordinary Portland Cement (OPC) with 5%, 10%, 15% and 20% of rice husk ash (RHA) and the percentage of addition of fly ash (FA) is fixed as 15% for all these mixes. It was observed that the specimen incorporating 10% of rice husk ash (RHA) and 15% of fly ash (FA) as ternary blend exhibits better mechanical properties such as: Compressive, split tensile and flexural strengths at 28 days of age as compared to traditional mix of SCC without RHA (Rice Husk Ash) and FA (Fly Ash). This research demonstrates that the ideal percentage for a mixture of rice husk ash (RHA) and fly ash as ternary blend is 10% and 15% respectively.

scholarly journals Effect of addition JORPHOS to Self-Compacting Concrete for Chloride Penetration

2016 ◽  
Vol 5 (2) ◽  
pp. 1
Author(s):  
Mahmoud B. Alhasanat ◽  
Arabi N. S. Al Qadi ◽  
Loai A. Al Tarabulsi ◽  
Omar A. Al khashman
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Chloride Penetration ◽  
Harsh Environments ◽  
Reinforced Concrete Structures ◽  
Permeability Test ◽  
Self Compacting Concrete ◽  
Chloride Permeability ◽  
Maintenance And Repair ◽  
Repair Costs

<p class="1Body">Reinforced concrete structures are exposed to harsh environments, yet they are often expected to last with little or no repair or maintenance for long periods of time (often 100 years or more). For this reason, a durable structure needs to be produced. In addition, bridge reinforced concrete suffering from attacks of chloride penetration that cause corrosion of the steel in the reinforcement concrete that leads to reduction in strength and serviceability cracking, which cause further repair and rehabilitation for the structure and greater maintenance and repair costs. This research focuses on self-compacting concrete with Jordanian Phosphate (JORPHOS) as a filler. The permeability for different percentages of JORPHOS were tested by using Rapid Chloride Permeability Test (RCPT). It was concluded that the addition of different percentages of JORPHOS minimizes chloride penetration in concrete.</p>

scholarly journals A Comprehensive Study on the Hardening Features and Performance of Self-Compacting Concrete with High-Volume Fly Ash and Slag

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4286
Author(s):  
Zhenghong Yang ◽  
Sijia Liu ◽  
Long Yu ◽  
Linglin Xu
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Free Water ◽  
High Volume ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Main Concern ◽  
Self Compacting Concrete ◽  
Chloride Permeability ◽  
Early Hydration

The main concern of this work is to evaluate the influences of supplementary cementitious materials (fly ash, slag) and a new type of polycarboxylate superplasticizer containing viscosity modifying agents (PCE-VMA) on the performance of self-compacting concrete (SCC). The workability, hydration process, mechanical property, chloride permeability, degree of hydration and pore structure of SCC were investigated. Results indicate that the addition of fly ash and slag slows down early hydration and decreases the hydration degree of SCC, and thus leads to a decline in compressive strengths, especially within the first 7 days. The addition of slag refines pore structure and contributes to lower porosity, and thus the chloride permeability of SCC is decreased during the late hydration stage. Additionally, a new factor of calculated water–binder ratio is put forward, which can directly reflect the free water content of concrete mixture after mixing, and guide the mix proportion design of SCC.

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