养护条件对地聚物胶凝材料的力学性能影响

Effect of Maintenance Conditions on the Mechanical Properties of Geopolymer Cementitious Materials

以矿渣、粉煤灰和沸石粉为主要原料,NaOH和水玻璃为碱激发剂,在标准养护和室温养护条件下制备地聚物。采用三个因素三个水平进行正交试验设计,揭示三个因素对地聚物28 d抗压强度的影响并以28 d抗压强度为指标,确定制备地聚物的最佳配合比。试验结果表明:在标准养护和室温养护条件下,水胶比对试件抗压强度有显著影响。标准养护条件制备地聚物最佳配合比组合即矿渣、粉煤灰和沸石粉配合比分别为50%、25%和25%,水胶比为0.35,水玻璃模数为1.4,最高强度为68.4 MPa。室温养护条件制备地聚物最佳配合比组合即矿渣、粉煤灰和沸石粉配合比分别为50%、25%和25%,水胶比为0.40,水玻璃模数为1.4,最高强度为60.35 MPa,可见不同养护条件对抗压强度影响较大。

The geopolymer was prepared by using slag,fly ash and zeolite powder as the main raw materials,NaOH and water glass as alkali exciter,in the standard curing and room temperature curing preparation of ground polymer.An orthogonal experimental design with three factors and three levels was used to reveal the effects of the three factors on the 28 d compressive strength of the geopolymer and to determine the optimal ratio of the geopolymer using the 28 d compressive strength as the index.The test results show that the water-cement ratio has a significant effect on the compressive strength of the specimens under the standard and room temperature curing conditions.The best mix ratio of the combination of the polymer,namely the slag,fly ash and zeolite powder,is 50%,25%and 25%respectively,with water-cement ratio of 0.35 and water-glass modulus of 1.4,and the maximum strength was 68.4 MPa at standard maintenance conditions.The best combination of slag,fly ash and zeolite powder was 50%,25%and 25%,respectively,with water-cement ratio of 0.40 and water-glass modulus of 1.4.The maximum strength was 60.35 MPa with a water-glass modulus of 1.4 at room temperature,it can be seen that different curing conditions have a great impact on the compressive strength.