The concrete mix ratio of 1:2:4. was prepared using water/cement of 0.65 with 0%, 25%, 50%, 75% and 100% sawdust as partial replacement for fine sand. The coefficient of uniformity and coefficient of curvature of the sand used in this study was 1.049 and 1.324 respectively which shows that the sand is a well graded sand as it does not exceed the range of 1 and 3 for ; and maximum of 6 for specified by the British standard. The aggregate crushing value (ACV) obtained is 43.75 which is within the specified value of 45 as specified by the British standard (BS 812-110 1992). However, values of 40mm, 9mm and 5mm respectively was obtained for workability at 0%, 25% and 50% addition of sawdust as partial replacement for sand, while 14.15 N/mm 2 , 12.96 N/mm 2 and 11.93 N/mm 2 , were obtained for compressive strength with 25%, 75% and 100% sawdust as partial replacement. The Compressive strength values obtained were found not to conform to the minimum requirement of 17N/mm 2 for light weight concrete. Using sawdust in a proportion greater than 25% replacement of sand is however detrimental to strength and density properties of concrete.
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机译：混凝土配合比为1：2：4。使用0.65的水/水泥制备水泥，用0％，25％，50％，75％和100％的木屑代替细砂。本研究中所用砂的均匀系数和曲率系数分别为1.049和1.324，表明该砂是分级良好的砂，因为它的含量不超过1和3的范围;最高为英国标准指定的6。所获得的总压碎值（ACV）为43.75，在英国标准（BS 812-110 1992）规定的45的规定值内。但是，在分别添加0.5％，25％和50％的木屑作为沙子的部分替代品时，可加工性分别达到40mm，9mm和5mm，而14.15N / mm 2，12.96N / mm 2和11.93N / mm 2用25％，75％和100％的木屑作为部分替代物获得了抗压强度为1μm的粉末。发现获得的抗压强度值不符合轻质混凝土的最低要求17N / mm 2。然而，使用比例大于25％的木屑替代沙子会损害混凝土的强度和密度特性。
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