Due to increased construction the use of concrete is also increased. Concrete consists of Ordinary Portland Cement (OPC), aggregates (coarse and fine) and water. To improve the characteristics of concrete, nowadays addition of admixtures to the concrete is widely used. Admixture should be easily available and cost effective. Here in this study, we introduce easily available and cost effective admixture Pulp Black Liquor (PBL), a byproduct from paper industry. The discharge of pulp black liquor to the environment will cause serious environmental issues. So by adding pulp black liquor to concrete as an admixture, can reduce environmental issues and improves the properties of concrete like workability, compressive strength and split tensile strength. In this study the effects of PBL on concrete were studied using two different design mixes.