scholarly journals Strength of Concrete with RHA and Metakaolin

2019 ◽  
Vol 9 (2) ◽  
pp. 4689-4693
Keyword(s):  
Silica Fume ◽  
Rice Husk ◽  
Slow Rate ◽  
Rice Husk Ash ◽  
Interfacial Transition Zone ◽  
Solid Materials ◽  
Pozzolanic Reactivity ◽  
Chemical Admixtures ◽  
Early Strength

HPC can be produced by incorporating fine ground solid materials like Metakaolin and RHA to strengthen the interfacial transition zone and chemical admixtures and also reduces the ratio between water to binder. The pozzolanic reactivity of rice husk ash and Metakaolin are very low at initial ages. So for the production of HPC, along with metakaolin and rice husk ash when silica fume is combined, the slow rate of hydration RHA and metakaolin will be compensated by the silica fume to have a better early strength. Hence, the effect of RHA and Metakaolin is combined together to get the quality of sturdiness attributes of HPC. The fatigue strength of HPC is compared for both the materials.

scholarly journals Pozzolanic Reactivity of Silica Fume and Ground Rice Husk Ash as Reactive Silica in a Cementitious System: A Comparative Study

Materials ◽  
2016 ◽  
Vol 9 (3) ◽  
pp. 146 ◽  
Author(s):  
Weiting Xu ◽  
Tommy Lo ◽  
Weilun Wang ◽  
Dong Ouyang ◽  
Penggang Wang ◽  
...  
Keyword(s):  
Comparative Study ◽  
Silica Fume ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Pozzolanic Reactivity ◽  
System A ◽  
Cementitious System ◽  
Reactive Silica

Development of Ternary Concrete Utilizing Agricultural Waste Material

2022 ◽  
Author(s):  
Sunita Kumari ◽  
Dhirendra Singhal ◽  
Rinku Walia ◽  
Ajay Rathee
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Concrete Mix ◽  
Maize Cob

Abstract The present project proposes to utilize rice husk and maize cob husk ash in the cement to mitigate the adverse impact of cement on environment and to enhance the disposal of waste in a sustainable manner. Ternary concrete / MR concrete was prepared by using rise husk and maize cob ash with cement. For the present project, five concrete mixes MR-0 (Control mix), MR-1 (Rice husk ash 10% and MR-2.5%), MR-2 (Rice husk ash 10% and MR-5%), MR-3 (Rice husk ash 10% and MR-2.5%), MR-4 (Rice husk ash 10% and MR-2.5%) were prepared. M35 concrete mix was designed as per IS 10262:2009 for low slump values 0-25mm. The purpose is to find the optimum replacement level of cement in M35 grade ternary concrete for I – Shaped paver blocks.In order to study the effects of these additions, micro-structural and structural properties test of concretes have been conducted. The crystalline properties of control mix and modified concrete are analyzed by Fourier Transform Infrared Spectroscope (FTIR), Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD). The results indicated that 10% Rice husk ash and 5% maize cob ash replaced with cement produce a desirable quality of ternary concrete mix having good compressive strength. The results of SEM analysis indicated that the morphology of both concrete were different, showing porous structure at 7 days age and become unsymmetrical with the addition of ashes. After 28 day age, the control mix contained more quantity of ettringite and became denser than ternary concrete. XRD analysis revealed the presence of portlandite in large quantity in controlled mix concrete while MR concrete had the partially hydrated particle of alite.

scholarly journals APPLICATION OF COCONUT FIBER AND POLYVINYL-ALCOHOL BLENDS TO IMPROVE THE DURABILITY OF CONCRETE STRUCTURES IN VIETNAM

InterConf ◽  
2021 ◽  
pp. 418-426
Author(s):  
Thi Ngoc Quyen Nguyen
Keyword(s):  
Polyvinyl Alcohol ◽  
Calcium Hydroxide ◽  
Silica Fume ◽  
Rice Husk ◽  
Coarse Aggregate ◽  
Rice Husk Ash ◽  
Coconut Fiber ◽  
Conventional Concrete ◽  
Cement Powder ◽  
Durability Of Concrete

The biggest disadvantage of conventional concrete is brittle and hard, in addition, its durability is not high. The low durability of concrete is due to the presence of calcium hydroxide at the intersection of coarse aggregate particles and hard cement powder. The introduction of coconut fiber and polyvinyl alcohol (PVA) fibers into the concrete to improve the durability and flexibility of the concrete. In addition, the article also considers the effects of other additives such as rice husk ash, silica fume to study the performance of the structure as well as its durability when joining concrete mixes to create flexible concrete movable and more flexible than conventional concrete.

MECHANICAL AND DURABILITY CHARACTERISTICS OF GGBS DOLOMITE GEOPOLYMER CONCRETE

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Aikot Pallikkara Shashikala ◽  
Praveen Nagarajan ◽  
Saranya Parathi
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Setting Time ◽  
Cementitious Materials ◽  
Strength Properties ◽  
Industrial Wastes ◽  
Geopolymer Concrete ◽  
By Products

Production of Portland cement causes global warming due to the emission of greenhouse gases to the environment. The need for reducing the amount of cement is necessary from sustainability point of view. Alkali activated and geopolymeric binders are used as alternative to cement. Industrial by-products such as fly ash, ground granulated blast furnace slag (GGBS), silica fume, rice husk ash etc. are commonly used for the production of geopolymer concrete. This paper focuses on the development of geopolymer concrete from slag (100% GGBS). Effect of different cementitious materials such as lime, fly ash, metakaolin, rice husk ash, silica fume and dolomite on strength properties of slag (GGBS) based geopolymer concrete are also discussed. It is observed that the addition of dolomite (by-products from rock crushing plants) into slag based geopolymer concrete reduces the setting time, enhances durability and improves rapidly the early age strength of geopolymer concrete. Development of geopolymer concrete with industrial by-products is a solution to the disposal of the industrial wastes. The quick setting concrete thus produced can reduce the cost of construction making it sustainable also.

Effect of Milling Process for Rice Husk Ash on Mechanical Strength of Blended Portland Cement Mortars

2014 ◽  
Vol 600 ◽  
pp. 240-249
Author(s):  
Everton Jose da Silva ◽  
Maria Lidiane Marques ◽  
Antonio Rogério B. Vasconcelos ◽  
Jorge L. Akasaki ◽  
Mauro M. Tashima ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Agricultural Waste ◽  
Research Area ◽  
Milling Process ◽  
Low Carbon ◽  
Waste Products ◽  
Pozzolanic Reactivity ◽  
Cement Mortars ◽  
Sugar Cane Bagasse Ash

Nowadays, the reuse of waste products in the construction process is a priority research area. Several industrial and agricultural waste products have been investigated, such as fly ash, sugar cane bagasse ash and rice husk ash. This paper analyzes a very important aspect under intense discussion in the scientific community: the Rice Husk Ash (RHA) grinding process. This paper investigates a low carbon RHA with high pozzolanic reactivity produced under uncontrolled burning conditions. The compressive strength of mortar specimens prepared using both ground and natural RHA were tested for 3-56 days and the capillarity absorption was measured for mortars cured during 28 days. Very promising and interesting results were obtained using natural rice husk ash in the production of blended mortars.

Pozzolanic reactivity of mesoporous amorphous rice husk ash in portlandite solution

2014 ◽  
Vol 59 ◽  
pp. 111-119 ◽  
Author(s):  
Viet-Thien-An Van ◽  
Christiane Rößler ◽  
Danh-Dai Bui ◽  
Horst-Michael Ludwig
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Pozzolanic Reactivity

scholarly journals Stabilization of Earth Block Using Rice Husk Ash as Partial Replacement in Cement

2021 ◽  
pp. 12-22
Author(s):  
S. E. Ubi ◽  
P. O. Nkra ◽  
R. B. Agbor
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Crystalline Silicon ◽  
High Specific Surface Area ◽  
Partial Replacement ◽  
Testing Specimen ◽  
Pozzolanic Reactivity ◽  
Pozzolanic Material ◽  
Compressed Earth Block ◽  
Earth Block

The most outstanding problem militating the production of earth block in Nigeria, is the exorbitant prices of cement, rice ash replaced with cement, stabilized compressed earth block to carry load. The main objective of this study was to investigate the sustainability of earthen construction block with a partial replacement of cement using Rice Husk Ash (RHA). RHA is a bye-product material obtained from the combustion of rice husk which consists of non-crystalline silicon dioxide with high specific surface area and high pozzolanic reactivity using a set of sieves 3.35um - 63um, weigh balance, oven maintained at a temperature of 105°C and 110°C, six meta trays, a bucket, a soap, wire brushes, and a mechanical shaker. It is used as pozzolanic material in earth block. Testing specimen were determined and examine in structural composition by means of unconfined compressive strength hydraulically compressed for crushing the composition of mix with RHA content ranges from 10% to 50% to respectively. The result of the compressed earth block shows a significant resistance of shear strength of 30 to 90 kg/mm2, proving that stabilized earth block can satisfactorily carry load when structurally loaded and can resist tensile and compressive stresses.

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