Journal of Civil Engineering Research 

About: Journal of Civil Engineering Research is an academic journal published by Scientific and Academic Publishing. The journal publishes majorly in the area(s): Compressive strength & Ultimate tensile strength. It has an ISSN identifier of 2163-2316. It is also open access. Over the lifetime, 184 publications have been published receiving 1146 citations.

Predicting Pavement Condition Index Using International Roughness Index in a Dense Urban Area

Abstract: A number of pavement condition indices are obtained and used to conduct pavement management assessments, two of which are the International Roughness Index (IRI) and Pavement Condition Index (PCI). The IRI is typically obtained using specialized equipment which indicates the smoothness of the roadway segment based on established computer algorithms, while the PCI is based on subjective rating of the number of pavement distresses. The literature suggests that most of these pavement indices are related as a result of which several jurisdictions have developed models to predict one index from the other. This study used 2 years of IRI-PCI data sets to develop models that predict PCI from IRI by functional classification and by pavement type in the District of Columbia. The results of the descriptive statistics, based on the mean IRI and PCI values, suggest that highways have a smoother ride than arterials, followed by collectors and local roads. Similarly, when the data was analyzed by pavement type, the results show that Composite Pavements were smoother than Asphalt Pavements followed by Concrete Pavement. The regression models between the IRI and PCI by functional classification and pavement type were determined to be statistically significant within the margin of error (5% level of significance), with R 2 values between 0.56 and 0.82. The results of the ANOVA tests also showed statistically significant F - statistics (p < 0.05) in addition to statistically significant regression coefficients (from the t-tests, with p < 0.05). The residual plots for all the models also showed randomness about the zero line indicating their viability, in addition to the normal probability plots showing points near a straight line.

A Review Paper on Self Healing Concrete

Abstract: Crack formation is very common phenomenon in concrete structure which allows the water and different type of chemical into the concrete through the cracks and decreases their durability, strength and which also affect the reinforcement when it comes in contact with water, CO2 and other chemicals. For repairing the cracks developed in the concrete, it requires regular maintenance and special type of treatment which will be very expansive. So, to overcome from this problem autonomous self-healing mechanism is introduced in the concrete which helps to repair the cracks by producing calcium carbonate crystals which block the micro cracks and pores in the concrete. The selection of the bacteria was according to their survival in the alkaline environment such as B. pasteurii, Bacillus subtilis and B. spharicus which are mainly used for the experiments by different researchers for their study. The condition of growth is different for different types of bacteria. For the growth, bacteria were put in a medium containing different chemical at a particular temperature and for a particular time period. Bactria improves the structural properties such as tensile strength, water permeability, durability and compressive strength of the normal concrete which was found by the performing different type of experiment on too many specimens had varying sizes used by different researchers for their study of bacterial concrete in comparison with the conventional concrete and from the experiment it was also found that use of light weight aggregate along with bacteria helps in self healing property of concrete. For gaining the best result a mathematical model was also introduced to study the stress-strain behavior of bacteria which was used to improve the strength of concrete.

Evaluation of Modulus of Elasticity and Modulus of Subgrade Reaction of Soils Using CBR Test

Abstract: This paper presents the procedure of evaluation of the modulus of elasticity (E) and the modulus of subgrade reaction (ks) value based on the California Bearing Ratio (CBR) tests and FEM analysis. The pressure-displacement response of the soil in the CBR mould is simulated using Cosmosworks FEM model where the soil, the load plunger, and the steel mould of CBR are represented. The correlation of Modulus of Elasticity (E) with California Bearing Ratio (CBR) is developed based on the elastic properties of the soil sample. Furthermore, the correlation between E and CBR is proposed. Using the E values, modulus of subgrade reaction can be calculated and vice versa as well. Thus CBR test is expected to simplify the effort in determination of the modulus of subgrade reaction which is used in Foundation design, soil structure interaction, design of highway formations etc.

Back Analysis of Slope Failure Using Finite Element with Point Estimate Method (FEM-PEM)

Abstract: This paper investigates the slope failure in Precinct 9, Putrajaya, Malaysia by using numerical back analysis method. The catastrophic slope failure was triggered by a cumulative rainfall of 210 mm that occurred 2 days before the occurrence of slope failure. Site investigation that includes borehole sampling was immediately conducted to obtain representative information for the study area. The slope can be divided into 3 layers namely gravelly silt, silt and bedrock. Due to the uncertainty about the actual cause of failure initiation, back analyses have been performed via finite element shear strength reduction method for considering various probable mechanisms. In order to deal with the uncertainty and variability of the soil parameters, the Point Estimate Method (PEM) approach that assumed a normal and uncorrelated distribution was adopted in this study. Analysis results show that the slope failure is mainly influenced by the shear strength of the silt layer where the cohesion and friction angle at failure were 11 kPa and 20° respectively. Besides, the modeled circular slip surface also agrees well with the observed one.

Strength and Durability Properties of Granite Powder Concrete

Abstract: The most commonly used fine aggregate across world is river sand. River sand is expensive due to excessive cost of transportation from natural sources. Also large scale depletion of the source creates environmental problems. As environmental, transportation and other constraints make the availability and use of river sand less attractive. A substitute or replacement product for concrete industry needs to be found. The main parameter investigated in this study is M30 grade concrete with replacement of sand by granite powder by 0, 25 and 50% and cement was partial replacement with silica fume, fly ash, slag and super plasticizer. This paper presents a detailed experimental study on compressive strength, split tensile strength 28, 56 and 90 days. Durability study on chloride attack was also studied and percentage of weight loss is compared with normal concrete. Test results indicate that use of granite powder and admixtures in concrete has improved the performance of concrete in strength as well as in durability aspect.