Modified water-cement ratio law for compressive strength of rice husk ash concrete

The purpose of this paper is to discuss the influence of mineral additives i.e. metakaolin, silica fume, rice ash and fly ash incorporating with nanocarbontubes mortar composites. The effects on compressive strength at 28 days were also discussed and presented. Cement content of 500 kg/m3, water/cement ratio of 0.6 and aggregate/cement ratio of 2.75 were adopted for the mix propotion. 1%, 3% and 5% of nanocarbontubes in mortar were combined with 15% of mineral additives. The results show that mixtures of nanocarbontubes with 15% of metakaolin produce better strength compared to normal mortar. Meanwhile with addition of fly ash and rice husk ash the strength were decreased. The electrical resistance for all mixes at 28 days were also discussed and presented. The higher percentages of nanocarbon with addition of all mineral additives resulted in lower electrical resistance properties

Download Full-text

Effect of Rice Husk Ash and Water-Cement Ratio on Strength of Concrete

Civil Engineering Journal ◽

10.28991/cej-03091166 ◽

2018 ◽

Vol 4 (10) ◽

pp. 2373 ◽

Cited By ~ 11

Author(s):

Naraindas Bheel ◽

Shanker Lal Meghwar ◽

Suhail Ahmed Abbasi ◽

Lal Chand Marwari ◽

Jabbar Ahmed Mugeri ◽

...

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Research Work ◽

Testing Machine ◽

The Body ◽

Mineral Admixture ◽

Partial Replacement ◽

Cement Ratio ◽

Water Cement Ratio ◽

Splitting Test

In present status quo, number of researcher are working on waste materials as potential supplement for any of the constituent of concrete to cope with sustainable development. As, the ingredients which constitute the body and give strength to concrete are natural available limited material and has to deplete one day. Thus, there is desperately need of alternate that may replace the limited natural resources. In this regard, this study focuses the rice husk ash (waste stuff) as partial replacement of cement and its possible impact on strength of concrete. In addition, this research work also this research work is conducted to investigate the effect of water-cement ratio on the strength of concrete at 10% partially replacement of Rice husk ash (RHA) by the weight of cement. RHA is a mineral admixture obtained by burning husk at certain temperature. Since as per pervious researches, the physical and chemical properties of RHA are very reactive Pozzolans and possess binding properties so can be used as cement supplement. Therefore, for laboratory experimental work, total 144 cubical and 72 cylindrical. In this research, number of concrete specimens were cast and tested at 1:2:4 mix ratio with various w/c ratios i.e. 0.45, 0.50 and 0.60. Further, at each specified water-cement ratio, two mechanical properties (compressive and splitting tensile strength) were determined in Universal Testing Machine (UTM). These physical properties of concrete were investigated at 7, 14, 28 and 56 days curing period. The experimental results show that the compressive strength gets increased up to 14.51% and tensile splitting test strength increased up to 10.71% at the w/c ratio of 0.45. The workability of plain fresh concrete at all w/c ratios is slightly greater than the workability of concrete blended with 10% RHA. Thus, RHA improves the properties of concrete when used in specific amount. As a result, it can reduce the overall cost of construction and it will reduce the adverse environmental effect.

Download Full-text

Use of Nondestructive Testing of Ultrasound and Artificial Neural Networks to Estimate Compressive Strength of Concrete

Buildings ◽

10.3390/buildings11020044 ◽

2021 ◽

Vol 11 (2) ◽

pp. 44

Author(s):

Fernando A. N. Silva ◽

João M. P. Q. Delgado ◽

Rosely S. Cavalcanti ◽

António C. Azevedo ◽

Ana S. Guimarães ◽

...

Keyword(s):

Neural Networks ◽

Compressive Strength ◽

Artificial Neural Networks ◽

Cross Sections ◽

Influential Factors ◽

Average Error ◽

Ann Model ◽

Cement Ratio ◽

Water Cement Ratio ◽

Artificial Neural

The work presents the results of an experimental campaign carried out on concrete elements in order to investigate the potential of using artificial neural networks (ANNs) to estimate the compressive strength based on relevant parameters, such as the water–cement ratio, aggregate–cement ratio, age of testing, and percentage cement/metakaolin ratios (5% and 10%). We prepared 162 cylindrical concrete specimens with dimensions of 10 cm in diameter and 20 cm in height and 27 prismatic specimens with cross sections measuring 25 and 50 cm in length, with 9 different concrete mixture proportions. A longitudinal transducer with a frequency of 54 kHz was used to measure the ultrasonic velocities. An ANN model was developed, different ANN configurations were tested and compared to identify the best ANN model. Using this model, it was possible to assess the contribution of each input variable to the compressive strength of the tested concretes. The results indicate an excellent performance of the ANN model developed to predict compressive strength from the input parameters studied, with an average error less than 5%. Together, the water–cement ratio and the percentage of metakaolin were shown to be the most influential factors for the compressive strength value predicted by the developed ANN model.

Download Full-text

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

Materials ◽

10.3390/ma14123216 ◽

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.

Download Full-text

Study on Preparation of Solid Concrete Brick with Recycled Aggregate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.648.108 ◽

2013 ◽

Vol 648 ◽

pp. 108-111

Author(s):

Qi Jin Li ◽

Guo Zhong Li

Keyword(s):

Compressive Strength ◽

Mass Fraction ◽

Recycled Aggregate ◽

Preparation Process ◽

Mass Ratio ◽

Construction Waste ◽

Cement Ratio ◽

Water Cement Ratio ◽

Optimal Value

The construction waste was processed into recycled aggregate to produce solid construction waste brick with grade of MU20. The preparation process of recycled aggregate and the optimal value of mass ratio of water to cement (water cement ratio) and mass ratio of recycled aggregate to cement was studied. The results shows that when the water cement ratio is 0.86 and the mass ratio of recycled aggregate to cement is 5.5 and the dosage of activator is 0.25% (mass fraction with recycled aggregate), the compressive strength of sample is 22.5MPa and can be satisfied with the requirement of MU20 solid concrete brick.

Download Full-text

Physical Properties of Cement Mortar Containing Waste Ash

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.804.129 ◽

2015 ◽

Vol 804 ◽

pp. 129-132

Author(s):

Sumrerng Rukzon ◽

Prinya Chindaprasirt

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Rice Husk ◽

Rice Husk Ash ◽

Cement Mortar ◽

Ash Content ◽

Water Requirement ◽

Test Results ◽

Pozzolanic Material ◽

Materials Used

This research studies the potential for using waste ash from industrial and agricultural by-products as a pozzolanic material. Classified fly ash (FA) and ground rice husk ash (RA) were the materials used. Water requirement, compressive strength and porosity of cement mortar were investigated. Test results indicated that FA and RA (waste ash) have a high potential to be used as a good pozzolanic material. The water requirement of mortar mix decreases with the increases in fly ash content. For ground rice husk ash (RA), the water requirement of mortar mix increases with the increases in rice husk ash content. In addition, the reduction in porosity was associated with the increase in compressive strength.

Download Full-text

Influence of Aggregate Gradation on the Engineering Properties of Lightweight Aggregate Concrete

Applied Sciences ◽

10.3390/app8081324 ◽

2018 ◽

Vol 8 (8) ◽

pp. 1324 ◽

Cited By ~ 3

Author(s):

How-Ji Chen ◽

Chung-Hao Wu

Keyword(s):

Compressive Strength ◽

Lightweight Aggregate ◽

Normal Weight ◽

Engineering Properties ◽

Lightweight Aggregate Concrete ◽

Aggregate Gradation ◽

Aggregate Concrete ◽

Cement Ratio ◽

Water Cement Ratio ◽

Expanded Shale

Expanded shale lightweight aggregates, as the coarse aggregates, were used to produce lightweight aggregate concrete (LWAC) in this research. At the fixed water-cement ratio, paste quantity, and aggregate volume, the effects of various aggregate gradations on the engineering properties of LWAC were investigated. Comparisons to normal-weight concrete (NWC) made under the same conditions were carried out. From the experimental results, using normal weight aggregates that follow the specification requirements (standard gradation) obtained similar NWC compressive strength to that using uniform-sized aggregates. However, the compressive strength of LWAC made using small uniform-sized aggregates was superior to that made from standard-grade aggregates. This is especially conspicuous under the low water-cement ratio. Even though the workability was affected, this problem could be overcome with developed chemical additive technology. The durability properties of concrete were approximately equal. Therefore, it is suggested that the aggregate gradation requirement of LWAC should be distinct from that of NWC. In high strength LWAC proportioning, following the standard gradation suggested by American Society for Testing and Materials (ASTM) is optional.

Download Full-text

Strength and Durability Performance of Alkali-Activated Rice Husk Ash Geopolymer Mortar

The Scientific World JOURNAL ◽

10.1155/2014/209584 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 20

Author(s):

Yun Yong Kim ◽

Byung-Jae Lee ◽

Velu Saraswathy ◽

Seung-Jun Kwon

Keyword(s):

Compressive Strength ◽

Rice Husk ◽

Rice Husk Ash ◽

Polymerization Reaction ◽

Strength Development ◽

Geopolymer Concrete ◽

Portland Cement Concrete ◽

Mix Proportion ◽

Strength And Durability ◽

Alkali Activated

This paper describes the experimental investigation carried out to develop the geopolymer concrete based on alkali-activated rice husk ash (RHA) by sodium hydroxide with sodium silicate. Effect on method of curing and concentration of NaOH on compressive strength as well as the optimum mix proportion of geopolymer mortar was investigated. It is possible to achieve compressive strengths of 31 N/mm2and 45 N/mm2, respectively for the 10 M alkali-activated geopolymer mortar after 7 and 28 days of casting when cured for 24 hours at 60°C. Results indicated that the increase in curing period and concentration of alkali activator increased the compressive strength. Durability studies were carried out in acid and sulfate media such as H2SO4, HCl, Na2SO4, and MgSO4environments and found that geopolymer concrete showed very less weight loss when compared to steam-cured mortar specimens. In addition, fluorescent optical microscopy and X-ray diffraction (XRD) studies have shown the formation of new peaks and enhanced the polymerization reaction which is responsible for strength development and hence RHA has great potential as a substitute for ordinary Portland cement concrete.

Download Full-text

Research on Simulation Test of Coal Similar Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.850-851.847 ◽

2013 ◽

Vol 850-851 ◽

pp. 847-850 ◽

Cited By ~ 2

Author(s):

Lin Chao Dai

Keyword(s):

Compressive Strength ◽

Raw Materials ◽

Similarity Theory ◽

Design Method ◽

Uniform Design ◽

Physical And Mechanical Properties ◽

Raw Material ◽

Similar Material ◽

Cement Ratio ◽

Water Cement Ratio

In order to study the coal and gas outburst similar simulation experiment, coal similar material was made up based on the similarity theory. Based on the previous similar material study, the cement, sand, water, activated carbon and coal powder was selected as the raw material of similar material. Meanwhile similar material matching program with 5 factors and 6 levels was designed by using Uniform Design Method. And the physical and mechanical properties of the similar material compressive strength was measured under different proportions circumstances. The relationship between similar material and the raw materials was analyzed. The results show that choosing different materials can compound different similar materials with different requirements. And the water-cement ratio plays a decisive influence on the compressive strength of similar material. The compressive strength of similar material decreases linearly when the water-cement ratio increases.

Download Full-text

Effect of Mound Soil on Concrete Produced with River Sand

JOURNAL OF ADVANCES IN BIOTECHNOLOGY ◽

10.24297/jbt.v2i1.5050 ◽

2014 ◽

Vol 2 (1) ◽

pp. 75-82

Author(s):

Elivs M. Mbadike ◽

N.N Osadebe

Keyword(s):

Compressive Strength ◽

Research Work ◽

Strength Test ◽

Control Test ◽

River Sand ◽

Cement Ratio ◽

Water Cement Ratio ◽

Compressive Strength Test ◽

Average Compressive Strength

In this research work, the effect of mound soil on concrete produced with river sand was investigated. A mixed proportion of 1.1.8:3.7 with water cement ratio of 0.47 were used. The percentage replacement of river sand with mound soil is 0%, 5%, 10%, 20%, 30% and 40%. Concrete cubes of 150mm x 150mm x150mm of river sand/mound soil were cast and cured at 3, 7, 28, 60 and 90 days respectively. At the end of each hydration period, the three cubes for each hydration period were crushed and their average compressive strength recorded. A total of ninety (90) concrete cubes were cast. The result of the compressive strength test for 5- 40% replacement of river sand with mound soil ranges from 24.00 -42.58N/mm2 a against 23.29-36.08N/mm2 for the control test (0% replacement).The workability of concrete produced withÂ 5- 40% replacement of river sand with mound soil ranges from 47- 62mm as against 70mm for the control test.

Download Full-text