scholarly journals Evaluating parameter of fine aggregate content and grading on rheological properties of fresh mortar.

1985 ◽  
Vol 34 (376) ◽  
pp. 1-7
Author(s):  
Hiroyuki MIZUGUCHI
Keyword(s):  
Rheological Properties ◽  
Fine Aggregate ◽  
Aggregate Content

scholarly journals Effect of Waste Glass Addition as a Replacement for Fine Aggregate on Properties of Mortar

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3189 ◽  
Author(s):  
Marcin Małek ◽  
Waldemar Łasica ◽  
Mateusz Jackowski ◽  
Marta Kadela
Keyword(s):  
Mechanical Properties ◽  
Waste Glass ◽  
Fine Aggregate ◽  
Low Carbon ◽  
Glass Cullet ◽  
Split Tensile Strength ◽  
Glass Waste ◽  
Aggregate Content ◽  
Glass Aggregate ◽  
Glass Sand

A responsible approach towards sustainable development requires the use of environmentally friendly, low-carbon, and energy-intensive materials. One positive way is to use glass waste as a replacement for fine natural aggregate. For this purpose, the effects of adding glass cullet to the mechanical properties of mortar were carried out. The glass aggregate made from recycled post-consumer waste glass (food, medicine, and cosmetics packaging, including mostly bottles), were used. This experimental work included four different contents of fine glass cullet (5, 10, 15, and 20 wt.% of fine aggregate). The compressive, flexural, and split tensile strengths were evaluated. Moreover, the modulus of elasticity and Poisson coefficient were determined. The addition of glass sand aggregate increases the mechanical properties of mortar. When comparing the strength, the obtained improvement in split tensile strength was the least affected. The obtained effect for the increased analysed properties of the glass sand aggregate content has been rarely reported. Moreover, it was determined that by increasing the recycled glass sand aggregate content, the density of mortar decreased. In addition, the relationships between the properties for mortar containing glass sand aggregate were observed.

scholarly journals Influence of polymer fibers on rheological properties of cement mortars

2017 ◽  
Vol 7 (1) ◽  
pp. 228-236 ◽  
Author(s):  
Dorota Malaszkiewicz
Keyword(s):  
Rheological Properties ◽  
Volume Fraction ◽  
Fiber Type ◽  
Cementitious Materials ◽  
Plastic Viscosity ◽  
Synthetic Fiber ◽  
Rheological Parameters ◽  
Model Parameters ◽  
Fine Aggregate ◽  
Bingham Model

AbstractThe reinforcing effect of fibers in cement composites often results in the improvement of the brittle nature of cementitious materials. But the decrease in the workability of fresh concrete is often the disadvantage of fibers addition. Conventional single-point workability tests cannot characterize workability of concrete in terms of fundamental rheological parameters. To this end, this paper describes an investigation of the influence of synthetic fiber additions (fiber length in the range 12–50 mm and volume fraction in the range 0–4%) on the rheological properties of fiber reinforced fresh mortar (FRFM) and development of these properties over time. The rheometer Viskomat XL was used in this study. Within the limitations of the instrument and testing procedure it is shown that FRFMs conform to the Bingham model. Natural postglacial sand 0/4 mm was used as a fine aggregate and cement CEMI 42.5 R was used as a binder. Three commercial synthetic fibers were selected for these examinations. Rheological properties were expressed in terms of Bingham model parameters g (yield value ) and h (plastic viscosity). Based on the test results it was found out that the fiber type and volume fraction affected both the yield stress and plastic viscosity.

scholarly journals Study on Pervious Concrete by Partial Replacement of Silica Fume and GGBS with Cement and Addition of Glass Fibers

2020 ◽  
pp. 66-71
Author(s):  
V Venkatadurga Raju and V Bhargavi Y Priyanka,
Keyword(s):  
Compressive Strength ◽  
Ground Water ◽  
Silica Fume ◽  
Water Table ◽  
Glass Fibers ◽  
Pervious Concrete ◽  
Fine Aggregate ◽  
Ground Water Table ◽  
Aggregate Content ◽  
Pozzolanic Materials

Pervious Concrete for the pavements proves to be an effective and along- term solution for the universal problem of abnormal decrease of ground water table. Pervious Concrete has a unique mix design and giving special properties to the concrete which makes the concrete porous , allowing water from precipitation and other sources to pass directly through , there by reducing run off volume and increasing ground water table. Inorder to reduce the damage being caused to the environment by the use of cement , inpervious concrete , cement is replaced with pozzolanic materials such as GGBS , silica fume sand to increase strength and durability , glass fibers in stipulated ratio are added to the concrete mixture. In this study ,the mix designs such as M30 and PC30 are considered . The fine aggregate is replaced with coarseaggregate by different ratios like 0% , 5% , 10% ,15%. by adding different pozzolanic matrals like GGBS, silicafume with glassfibers. To find the effectiveness of the use of pozzolancic and glassfibes, compressive strength conducted. The following Conclusions can be summarized by analyzing tests performed on PC specimens. A significant reduction of workability. And A progressive addition in compressive strength by increasing the percentage of fine aggregates and pozzolanic materials in mix. The conclusion of fine aggregate content in the specimen increases the density and increase the pozzolanic materials addition. And addition of silica fume and GGBS in the mixtures improve strength , compressive strength increases even after adding pozzolanic materials. Due to increase of fine aggregate content. For all replacement levels of PC with other mixes goes on decreasing in strength when compared with parent grade ofM30. While comparing with PC with Pozzolanic materials, For 7 days there is a drastic change for same replacement, and for 28 days itshowssimilar trend for 25% pozzolanic concrete and goes on decreasing for strength for compressive strength. For all replacement levels of PC with pozzolanic goes on decreasing in strength when compared with parent grade of M30. Compressive strength slightly increased by adding glass fibers to the allmixes.

scholarly journals Predicting the drying shrinkage behavior of high strength portland cement mortar under the combined influence of fine aggregate and steel micro fiber

2017 ◽  
Vol 67 (326) ◽  
pp. 119 ◽  
Author(s):  
Zhengqi Li
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Cement Mortar ◽  
Drying Shrinkage ◽  
High Strength ◽  
Fiber Content ◽  
Fine Aggregate ◽  
Aggregate Content ◽  
Normal Strength ◽  
Gardner Model

The workability, 28-day compressive strength and free drying shrinkage of a very high strength (121-142 MPa) steel micro fiber reinforced portland cement mortar were studied under a combined influence of fine aggregate content and fiber content. The test results showed that an increase in the fine aggregate content resulted in decreases in the workability, 28-day compressive strength and drying shrinkage of mortar at a fixed fiber content. An increase in the fiber content resulted in decreases in the workability and drying shrinkage of mortar, but an increase in the 28-day compressive strength of mortar at a fixed fine aggregate content. The modified Gardner model most accurately predicted the drying shrinkage development of the high strength mortars, followed by the Ross model and the ACI 209R-92 model. The Gardner model gave the least accurate prediction for it was developed based on a database of normal strength concrete.

scholarly journals GREEN TECHNOLOGY THROUGH POROUS CONCRETE

2019 ◽  
Vol 1 (2) ◽  
pp. 189-194
Author(s):  
Acep Hidayat ◽  
Muhammad Isradi ◽  
Joewono Prasetijo
Keyword(s):  
Compressive Strength ◽  
Environmental Pollution ◽  
Experimental Method ◽  
Test Object ◽  
Green Technology ◽  
Fine Aggregate ◽  
Test Results ◽  
Normal Concrete ◽  
Porous Concrete ◽  
Aggregate Content

This research uses stone ash waste from the stone crusher industry to preserve the environment. This material is an ingredient in making normal concrete. The use of stone ash as a substitute for sand is expected to increase the compressive strength in the planned slump and can optimize the use of rock ash waste to reduce environmental pollution that occurs. This study uses an experimental method with a total of 32 pieces of specimens. Each variation consists of 3 samples with a variety of fine aggregate levels of 40%, 44%, and 46%. The test object is a concrete cylinder with a diameter of 15 cm and a height of 30 cm. Test results for compressive strength at seven days for fine aggregate content variations of 40%: 22.25 Mpa; 44%: 24.30 Mpa; 46%: 17.08 MPa. Test results of compressive strength at the age of 14 days for variations in fine aggregate levels of 40%: 26.10 Mpa; 44%: 28.51 Mpa; 46%: 20.04 Mpa. Test results of compressive strength at the age of 21 days for fine aggregate content variations of 40%: 28.18 Mpa; 44%: 30.78 Mpa; 46%: 21.63 MPa. With these results, the Porous concrete produced can be used as preservation and maintain environmental protection. This product very cheap when compared to the original concrete, which calculated 22 U$ per square. The use of porous concrete has an impact on people's behavior that will preserve the environment, especially water content in the soil.

Strong Interlocked Skeleton Dense Gradation for Cement-Fly Ash Stabilized Crushed-Stones

2011 ◽  
Vol 413 ◽  
pp. 507-513 ◽  
Author(s):  
Di Li ◽  
Ying Jun Jiang
Keyword(s):  
Mechanical Property ◽  
Experimental Study ◽  
Fly Ash ◽  
Compression Strength ◽  
Coarse Aggregate ◽  
Material Design ◽  
Fine Aggregate ◽  
Aggregate Gradation ◽  
Aggregate Content ◽  
Numerical Experimentation

In order to optimize the material design for cement-fly ash stabilized crushed-stones, the strong interlocked coarse skeleton gradation was put forward based on the numerical experimentation method. In addition, the vibration method was employed to carry out the experimental study on the mechanical property of the cement-fly ash stabilized crushed-stones. Besides, the influencing regularities of the mixed amount of cement and fly ash on the cement-fly ash stabilized crushed-stones were researched. The result showed that the numerically simulated coarse aggregate gradation had great interlocked power, and the fine aggregate content of 31%±3% had stabilized mechanical property. Then, strong interlocked skeleton dense gradation of the cement-fly ash stabilized crushed-stones was put forward. Furthermore, when the 7d compression strength was used as the research indicator, the best proportion of the cement and fly ash was 1:0.5~1:1, and when the ultimate strength was used as the research indicator, then, the best ratio of the cement and fly ash was 1:1~1:1.5. Therefore, the cement dosage was advised to be 3~4% and the mixture amount of fly ash was 4~5%.

Rheological properties of concretes with fine aggregate

1985 ◽  
Vol 15 (2) ◽  
pp. 253-260 ◽  
Author(s):  
J. Piasta ◽  
W. Grochal ◽  
L. Rudzinski
Keyword(s):  
Rheological Properties ◽  
Fine Aggregate

scholarly journals Assessment on Workability and Strength Properties of SCC using Quarry Rock Dust and different bases of Super Plasticizers & VMA

2020 ◽  
Vol 9 (3) ◽  
pp. 3225-3229
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Main Property ◽  
Strength Properties ◽  
Fine Aggregate ◽  
Modifying Agent ◽  
Aggregate Content ◽  
Concrete Properties ◽  
Powder Content ◽  
Rock Dust

SCC is a concrete which has the ability to flow like liquid. This flowability of concrete is achieved by limiting the size of coarse aggregate content. Also 20% of the coarse aggregate is replaced by utilizing flyash inorder to increase the percentage of powder content..And due to the scarcity and unavailability of sand, an alternate is choosen to measure the rate of workability of SCC using quarry rock dust. The main property and strength of SCC depends on its workability[1] Hence workability tests and its relative compressive strength have been conducted to measure SCC specimens with fine aggregate and quarry rock dust. Fluidity of the paste can be improved by increasing the content of water-powder ratio and by adding super plasticizers. Segregation and blockages can be avoided by reducing the coarse aggregate content. A viscosity modifying agent (VMA) helps to reduce the changes in concrete properties[2]. Thus, relative proportions of ingredients need to be carefully determined to impart self leveling and self compacting properties to SCC in the fresh stage. Thus SCC specimens have been casted with quarry rock dust and fine aggregate using three different bases of superplasticizers(HRWRA) such as polycarboxyl, naphthalene and melamine bases and VMA. And its workability and strength properties have been evaluated by conducting different tests.

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