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| Preparation of Waste Paper Sludge Ash and Its Effect on Properties of Cement Mortar |
| Received:March 31, 2023 |
| DOI：10.11980/j.issn.0254-508X.2023.12.012 |
| Key Words:waste paper sludge ash calcination temperature fluidity setting time compressive strength cement mortar |
| Fund Project:河南省科技攻关计划项目（222102320262）。 |
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| Abstract:In order to improve the resource utilization efficiency of waste paper sludge， waste paper sludge ash was prepared at a calcination temperature of 650 ℃. The fluidity， setting time and compressive strength of cement mortar mixed with waste paper sludge ash of 0， 5%， 10%， 15%， and 20% were studied. The results showed that the incorporation of sludge ash would reduce the fluidity of cement mortar. When the sludge ash content increased from 0 to 5%， the initial fluidity loss was about 14.2%， and when the sludge ash content increased to 20%， the initial fluidity loss was about 29.6%. The incorporation of sludge ash would shorten the setting time of cement mortar. When the sludge ash content was 15%， the setting time was obviously shortened， the initial setting time of mortar was shortened by about 53 min， and the final setting time was shortened by about 37 min. Adding sludge ash was beneficial to improve the compressive strength of cement mortar. When the sludge ash content increased from 0 to 5%， the compressive strength of cement mortar increased greatly. The 3 d compressive strength increased by about 12.5%， and the 28 d compressive strength increased by about 8.7%. |
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