อิทธิพลของการใช้กากปูนขาวจากอุตสาหกรรมผลิตเยื่อกระดาษแทนที่ปูนซีเมนต์ปอร์ตแลนด์ต่อสมบัติของคอนกรีตบล็อก
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Abstract
The aim of this research is to study the possibility of lime mud as Portland cement replacement materials for concrete masonry unit production. This study determined the optimal ratio of 20-80% by weight of lime mud waste replacement to compare with the replacement without lime mud with 5 formulas for making cubic blocks. The results showed that 20% by weight of lime mud waste replacement following formula B-CM yielded the maximum average density of 1,973 kg/m3, which was higher than the method without lime mud waste replacement. The next experiment results of density was 1,928 kg/m3 from C-CM formula. However, the compressive test by reducing cross sectional area with 20% and 40% by weight of lime mud waste replacement showed the maximum average compressive strength of 6.60 MPa (B-CM) and 4.02 MPa (C-CM), respectively. It can be concluded that lime mud waste partial replacement can improve the compressive strength of concrete masonry units. The results found that the average density of concrete masonry units with standard size following C-CM formula was 1,314.18 kg/m3, and the maximum average water absorption, saturation coefficient and average compressive strength were 9.4%, 10.3 and 2.27 MPa, respectively. These outcomes were found to meet the industrial standards: TIS 58-2533 for hollow non-load-bearing concrete masonry units.
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