Abstract

Flexible pavements are chosen specially in the high temperature gradient for construction of roads. However, increased volume of traffic, overloading and world climatic changes, have caused widespread problems with the performance of these pavements. On the other hand, the huge amount of polymer is being produced causing menace to the environment. Recycling the waste polymers and using it in road construction have also considerable environmental benefits, such as reduced need for landfill, less pollution of both air and water. The present study was carried out on recycled and virgin polymers with two different sizes (granulate and flour); polyethylene low density (LDPER & V), highdensity polyethylene (HDPER & V), ethylene-vinyl acetate (EVAR & V) were used for modification of pristine bitumen (VG- 30). The outcome of the laboratory standard tests (conventional characterization, storage stability, dynamic viscosity, and resilience) were used in order to choose best-recycled polymer materials and their production. After comprehensive investigations, it has been found that optimum dosage of modified binder with virgin and recycled EVA and LDPE are 3% and 5% by weight, respectively. In case of recycled HDPE, the 3% was determined as an optimum dosage of modifier while for virgin HDPE it is 5%.

Abstract

The present study is an attempt to find out the most important factors that affect the time overrun in marine construction projects. Based on the literature review and expert opinion, 18 critical factors that affect the time overrun are identified. An analysis was done using Relative Importance Index (RII) method to find out the ranks of all these factors. Poor project monitoring and lack of defined project management plan are identified as the most critical factors based on RII. Further these 18 factors were categorized into three parts, i.e. planning related, execution related, and general factors and it was found out that planning related factors are more critical, followed by execution and general factors based on average scores using descriptive analysis. However, one way ANOVA results indicated that all three factors are equally important for delay in projects and respondents do not differentiate a great deal between them.

The entire dataset was further investigated to see, if client, contractor and consultant differentiate between planning, execution and general factors. The findings indicate that all three stakeholders consider these factors equally important and do not differentiate between them.

Abstract

The current study focus on the performance of Azadirachtaindica (Neem) as a bio-adsorbent used for the removal of lead from polluted water, among various pollutants lead is the major pollutant in water. Conventionally theremoval of lead is carried out using chemical treatments. In the present research work the main aim is to remove Pb (lead) from polluted water using Neem powder. After literature review, we have selected Azadirachtaindica (Neem) which can be effectively used for the removal of lead from polluted water. Study was carried out with variation in contact time, variation in dosage and variation in concentration of bio- adsorbent. The sample of polluted water were tested using atomic adsorption spectroscopy (AAS-7000) for initial concentration of lead varied from 0.5-2 ppm, optimum results were obtained with 210 minutes contact time for dose of 50 mg/lit gives maximum removal efficiency of 97.80%. Similarvalues wereobtained for 0.5, 1, 1.5 and 2 ppm initial concentration of lead with removal efficiency 97.80 %,81.20%, 76.50 %, and 74.10% for 210 minutes contact time.

Abstract

In this experimental work, a series of test bricks were fabricated for the various percentage proportionate like a combination of 92% lateraite soil + 3% cement + 5% fly ash, 90% lateraite soil + 5% cement + 5% fly ash, 88% lateraite soil + 7% cement + 5% fly ash, bricks were compacted with a hydraulic press paver block using brick making machine and cured for 7, 14, 21 and 28 days, tested as per IS specification in both required dry and wet condition. Results of dry compressive strength, wet compressive strength and water absorption were tabulated. Test results show that the maximum compressive strength of laterite soil bricks are more than conventional red clay burnt bricks at below 7% cement stabilizer with fly ash. In comparison, of obtaining test results minimum of 3% cement + 5% fly ash binding material is sufficient in order to achieve required compressive strength.

Abstract

An earthquake is a natural disaster that occurs on earth, due to which the loss of life and property is at a greatest extent. One of its direct effects is on masonry structures. The masonry being brittle in nature tends to fail easily under lateral loads. In this paper, an attempt is made to increase the ductility of masonry by using geogrids as reinforcement. Geogrids are the high tensile geosynthetics which have high flexibility and durability. The stress strain behaviour is one of the most important characteristics of the material, which focuses on the behaviour of material under loading. A comparison study is made with and without geogrid reinforcement. The modulus of elasticity is found by constructing stack bond prisms using stabilized mud blocks.

Abstract

Cement was partially replaced by sugarcane bagasse ash at 0%, 5%, 10%, 15%, & 20% and the properties of concrete in both wet and hardened states are investigated experimentally and the results are compared. M25 grade design mix concrete (1:1.9:3.55) with 0.5 water cement ratio was used for this experimental research. Workability, compressive strength, split tensile strength, flexural strength, bond strength, and sulphate resistance tests were conducted to investigate the feasibility of sugarcane bagasse ash as a cement replacement material in concrete. Based on the results of the present experimental investigation, it is suggested that sugarcane bagasse ash without treatment/heating can be used to replace up to 10% cement in concrete.