Cold region covers over 50% all the world. As an indispensable part of project, concrete is greatly affected by temperature during curing process. In this paper, through orthogonal experiment design, we studied mixing temperature, steel fiber, and water reducing agent dosage on mixture slump; influence agent, accelerating content compressive strength concrete; final microstructure scanning elec...

This study assessed the usefulness of replacement coarse aggregate partially with electronic waste (e-waste) plastic in lightweight concrete since developing countries have been challenged management e-waste as well high cost aggregates for production. Coarse were replaced at 5%, 10%, 15%, and 20% a class C20. The particle size distribution was determined slump, compressive strength, water abso...

In the rapidly developing modern society, many raw materials, such as crushed limestone and river sand, which are limited, are consumed by the concrete industry. Naturally, the usage of waste materials in concrete have become an interesting research area in recent years, which is used to reduce the negative influence of concrete on the environment. Hence, this paper presents the development of ...

OBJECTIVES To investigate the validity over time of the fingertip-to-floor test (FTF) and the straight leg raising test (SLR) using the Roland Morris Disability Questionnaire (RMDQ) and correlation coefficient (r), and to assess the predictive value of factors related to the change in RMDQ over 12 months using multivariate regression analysis. DESIGN Longitudinal study. SETTING Outpatient p...

Abstract Anti-mud agents could improve the efficiency of action water reducers in concrete by preferentially. The anti-mud agent was preferentially adsorbed on clay surface, which reduces ineffective adsorption reducing to paste, thereby improving reduction efficiency. However, its application high-sediment content coal gangue gypsum backfill materials had not been reported. In this paper, comp...