Particle size, compaction characteristic and tablet strength of spray-dried fermented jackfruit pulp - microcrystalline cellulose binary powder mixture

The tableting properties for fermented spray dried jackfruit (FJP) and microcrystalline cellulose (MCC) powders were studied. 25% FJP + 75% MCC, 50% FJP + 50% MCC and 75% FJP + 25% MCC binary powder mixtures were compacted into tablet form at various compaction pressures ranging from 15.1 to 73.8 MPa. The properties were compared to pure FJP and MCC tablets. The addition of MCC resulted in a higher particle size and the increased in the plastic work of the tablet. The best ratio of FJP-MCC binary tablet was found to be at 25% FJP + 75% MCC where the tablet showed the highest tensile strength. In conclusion, the addition of MCC to FJP improved the compaction characteristics and the tablet mechanical strength.

Stabilisation of Clayey Soil with Shredded Tyre using Lime

This research work has been done mainly on the compaction characteristic (OMC-MDD, UCS) and strength properties (CBR Values) of expensive soils such as clayey soil. The engineering strength properties of expensive soils (clayey soil) such as compaction characteristics and bearing capacity can be improved by stabilization process of the soil. These properties can be improved by controlled compaction using the mechanical equipment’s or by addition of suitable admixtures like cement, fly ash, lime or by reinforcing the soil with shredded tyre, crumb rubber, plastic waste etc. But in recent years, tyre chips and lime are used very widely for stabilizing the soil, because these are economical than the other admixtures and are abundantly available in the market, so in this work lime treated shredded tyre has been used to improve the various strength properties of natural soil. Lime has been used as a binding material and also used for the treatment of the shredded tyre to make the tyre surface rougher. The objective of this work is to investigate the strength properties of natural clayey soil reinforced with different percentages of lime treated shredded tyre taken by the weight of natural soil and fixed percentage of lime as a binding material. A series of Standard Proctor Tests, Unconfined Compressive strength (UCS) tests and California Bearing Ratio (CBR) tests are being conducted on both the natural soil and reinforced soil with varying percentages of lime treated shredded Tyre (4%, 8%, 12% and 16%) by weight of natural soil and fixed percentage of Lime (10%).The value of MDD increases from 1.75g/cc to 1.93g/cc at 12% of tyre and 10% of lime , the value of UCS also increases from 3.35kg/cm2 to 5.63kg/cm2 at 12% of tyre and 10% of lime and the CBR value will also increase from 3.89% to 10.65% at 12% of shredded tyre and 10% of lime.

Compaction Characteristic of Lime Modified Expansive Soil

Through compaction test discussed about the compaction characteristics of expansive soil by lime modified in middle of Shandong province. The results show that the optimum moisture content is lower when the expansive soil is cured by dry compaction method, and the maximum dry density is higher. Compaction curve appeared the phenomenon of two peaks when expansive soil is cured by wet compaction method.Lime content of lime improved expansive soil, particle size composition, age and compaction function have influence on compaction curve.With the increase of the quantity of lime, the optimum moisture content increases, the maximum dry density decreases. With the age growth, the optimum moisture content increase slightly,the maximum dry density decreases slightly. The bigger the compaction work, the smaller moisture content is, the larger the maximum dry density is.

SGC Tests for Influence of Material Composition on Compaction Characteristic of Asphalt Mixtures

Compaction characteristic of the surface layer asphalt mixture (13-type gradation mixture) was studied using Superpave gyratory compactor (SGC) simulative compaction tests. Based on analysis of densification curve of gyratory compaction, influence rules of the contents of mineral aggregates of all sizes and asphalt on compaction characteristic of asphalt mixtures were obtained. SGC Tests show that, for the mixture with a bigger content of asphalt, its density increases faster, that there is an optimal amount of fine aggregates for optimal compaction and that an appropriate amount of mineral powder will improve workability of mixtures, but overmuch mineral powder will make mixtures dry and hard. Conclusions based on SGC tests can provide basis for how to adjust material composition for improving compaction performance of asphalt mixtures, and for the designed asphalt mixture, its compaction performance can be predicted through these conclusions, which also contributes to the choice of compaction schemes.

Bentonite Composite and Fibre

Composite soils have been widely used in civil engineering applications, especially in slopes, embankment dam and landfills. This paper aims to investigate effect of fiber inclusion on compaction characteristic of composite soil (i.e. clay composite). A series of laboratory tests carried out to evaluate fiber effect on optimum water content and maximum dry unit weight of composite soils. Clay was selected as soil part of the composite and natural fiber was used as reinforcement. The fiber parameters differed from one test to another, as fiber length varied from 10 mm to 20mm and fiber content were selected as 0.1% and 0.25%. For each test, compaction curved derived and the results were compared. The results proved that inclusion of fiber affected compaction behaviour of samples so that increasing in fiber content and length caused increasing in Optimum Moisture Content (OMC) and slightly decreased maximum dry unit weight.