玻璃粉和生物炭对砂浆塑性收缩及开裂行为的影响

Effects of Glass Powder and Biochar on Plastic Shrinkage and Cracking Behavior of Mortar

为探究可再生材料对砂浆塑性收缩及开裂的影响,本文选取玻璃粉和生物炭两种可再生材料,采用数字图像相关技术(DIC)定量评估不同掺量(2%、4%、6%,占水泥质量分数)玻璃粉和生物炭对砂浆塑性收缩和开裂行为的影响。结果表明,掺玻璃粉和生物炭组砂浆最大裂缝宽度均小于未添加玻璃粉和生物炭的对照组,因此添加2%~6%玻璃粉或生物炭对砂浆的塑性收缩及开裂均起到积极作用。玻璃粉表面光滑疏水,提高了砂浆的流动性,其填充效应和火山灰活性减缓了塑性收缩。生物炭具有多孔结构和吸水性,降低了砂浆的流动性,有效减缓了塑性收缩。

To investigate the effect of renewable materials on the plastic shrinkage and cracking behavior of mortar,this study selected two renewable materials,glass powder and biochar.Digital image correlation(DIC)technique was employed to quantitatively assess the influence of different dosages(2%,4%,6%by cement mass fraction)of glass powder and biochar on the plastic shrinkage and cracking behavior of mortar.The results indicate that the maximum crack width of mortar with glass powder and biochar is smaller than that of the control group without glass powder and biochar.Therefore,adding 2%~6%of glass powder or biochar has a positive effect on the plastic shrinkage and cracking of mortar.Glass powder,due to its smooth surface and hydrophobic nature,enhances the flowability of mortar,but the filling effect and pozzolanic activity of volcanic ash slow down the plastic shrinkage.Biochar,with its porous structure and water absorption capacity,reduces the flowability of mortar,effectively mitigating plastic shrinkage.