Stabilization of Expansive Soil Using Biomedical Waste Incinerator Ash

Expansive soils undergo high volume change due to cyclic swelling and shrinkage behavior during the wet and dry seasons. Thus, such problematic soils should be completely avoided or properly treated when encountered as subgrade materials. In the present study, the biomedical waste incinerator ash and lime combination was proposed to stabilize expansive soil. Particle size analysis, Atterberg limits, free-swell, compaction, unconfined compression strength, and California bearing ratio tests were conducted on the natural soil and blended with 3%, 5%, 7%, 9%, and 11% biomedical waste incinerator ash (BWIA). The optimum content of BWIA was determined based on the free-swell test results. To further investigate the relative effectiveness of the stabilizer, 2% and 3% lime were also added to the optimum soil-BWIA mixture and UCS and CBR tests were also conducted. In addition, scanning electron microscopy (SEM) tests for representative stabilized samples were also conducted to examine the changes in microfabrics and structural arrangements due to bonding. The addition of BWIA has a promising effect on the index properties and strength of the expansive soil. The strength of the expansive soil significantly increased when it was blended with the optimum content of BWIA amended by 2% and 3% lime.

Study on the Frost Resistance of Concrete Modified with Steel Balls Containing Phase Change Material (PCM)

In order to investigate the effect of phase change materials on the frost resistance of concrete in cold regions, hollow steel balls were used in this paper for the macroscopic encapsulation of the phase change material to replace some of the coarse aggregates in the preparation of phase change concrete. On the premise of ensuring reasonable mechanical properties, concrete mixed with different contents and different surface treatments of grouting steel balls were tested for the compressive strength and splitting tensile strength to determine the optimum content of phase change steel balls and investigate the frost resistance of phase change concrete. At the same time, industrial CT was used to explore the internal pore evolution pattern of concrete during the freeze–thaw period. The test results show that the optimum content of steel balls is 75%; during the freeze–thaw process, the mass loss, relative dynamic elastic modulus loss, and strength loss of phase change concrete are all lower than those of ordinary concrete, and the increase in porosity of phase change concrete is also significantly lower than that of ordinary concrete; the addition of phase change materials can optimise the distribution of the internal pore in concrete, improve its internal pore structure, and enhance its frost resistance.

A Review of the Concrete Performance at Elevated Temperature Mixed with Rice Husk and Polypropylene Fibre

This paper deals with the effect of addition of various proportion of polypropylene (PP) fibre and rice husk on the properties of concrete. A lot of experiments were conducted by different authors to explore the effect of raw rice husk and PP fibre and rice husk on tensile, compressive, flexural strength under different temperature condition. The objective of these experiments was to study the effect of polypropylene fibre and raw rice husk at different varying content and to find the optimum content of such admixtures. Concrete specimens were tested at different curing level to check mechanical properties of concrete. A detailed study was carried out at different high temperature conditions. Result shows polypropylene fibre provide a scape matrix to scape excess vapour pressure developed at higher temperature along with reinforcing properties. Rice husk works as a great insulating agent and also enhances the inert properties of concrete. With the various advantages and disadvantages of PP fibre and RRH, this paper is focusing on how there can be an establishment of a certain proportion which makes concrete thermally insulated maintaining higher strength.

EXPERIMENTAL INVESTIGATION ON M-SAND AND BASALT FIBER IN M25 GRADE CONCRETE

Concrete is the majorly used materials in all type of construction activites. It need a quality sources for obtaining good quality. It can achieve by only proper usage of these at appropriate quantities. Basalt fiber is a fiber when added provides an additional strength. The work carried in this project, replace fine aggregate with M-sand and basalt fiber as an additive to cement in various percentages. The determination of the compressive, flexural and tensile strength of M25 grade concrete is studied. The fine aggregate is completely replaced with M-sand and basalt fiber is added in 0%, 0.5%, 1% and 1.5%. Thus the changes in their compressive, flexural and tensile strength is observed for 14 days and 28 days and results are formulated and the optimum content of basalt fiber to be utilized for production of quality concrete is founded.

The Properties of Cement Mortar Reinforced by Pistachio Shells Fibre

Pistachio shells (PS) are one of the agricultural wastes, that are considered as economic and wide available material. It has some features that encourage using it to produce lightweight concrete and cement mortar. The essential objective of the current investigation is to evaluate the possibility of incorporating PS as a fibre in the cement mortar and the effect on its properties. Four different fibre percentages (0%, 0.5%, 1% and 1.5% by volume of cement) were examined. After curing the samples for 7 and 28 days, the fundamental properties of the cement mortars, including splitting tensile and compressive strengths I addition to the density, were determined and compared. The results revealed that the optimum content of the pistachio shells fibre lies between 0.5% and 1% where the splitting tensile and compressive strengths increased and the mortar’s density reduced at age of 28 days.

The Effect of the Addition of Polypropylene Fibers to Primer on the Pull-Off Strength of Epoxy Resin Coatings

This article describes the effect of adding polypropylene fibers to primer on the pull-off strength of epoxy resin coatings. Investigated primers were laid on substrates made of cement mortar and cement slurry. The primer was made of epoxy resin modified with the addition of 0.5%, 1%, 1.5% and 2% of polypropylene fibers. One reference sample was made without the addition of fibers. Then, an epoxy resin coating was applied to each substrate. Four pull-off strength tests were performed for each material configuration. For this purpose, an automatic device for measuring the pull-off strength of the coatings was used. The results were compared with the results obtained for the reference sample. The optimum content of polypropylene fibers was found to be in the range of 0.5–1.0 wt. % of the mass of the resin. One percent of fibers was optimum for the epoxy resin laid on the cement slurry, while 0.5 wt. % of fibers was optimum for the mortar substrate. The addition of a higher amount of polypropylene fibers resulted in a lower pull-off strength of coatings than for the reference sample.

Effects of Mechanical Properties of Concrete with Tio2 and Ggbs

Concrete is the abundant man made material in the world. The quantity of Co2 emission through the industrialized of OPC is almost one ton. The Co2 emission is approximately 7% of the worlds Co2 emission. In order to decrease the Co2 emission and create the sustainable environment we have to develop greener building material. In this the TiO2and GGBS is use in cement on mixing of concrete. In this TiO2 go about as a self cleaning material and the solid with expansion of TiO2 is 1% by mass of the concrete dependent on the past tasks are finished by the scientists and GGBS with 5%, 10% and 15% by mass of cement was prepared. In this research hardened tests are Compressive, Flexural, Split Tensile strength tests of concrete observations mixed with TiO2 and GGBS for optimum content was considered