- 柏秀奎1，林俊豪2，曹德光1，韋炫辰1，歐天安2，潘榮偉2，李乘光3
2022年第5期
摘要
引用本文
摘 ? 要：通過強度、干密度測試以及XRD、FTIR、SEM分析，研究了納米C-S-H對固硫灰蒸壓加氣混凝土性能及水化產物的影響。結果表明：隨著納米C-S-H摻量的增加，蒸壓加氣混凝土的干密度和抗壓強度均呈先增后降的趨勢，且當納米C-S-H摻量為3%時，蒸壓加氣混凝土的抗壓強度最大，較空白組提高了13.2%；在蒸壓養護條件下，納米C-S-H的摻入一方面促進了體系中的Ca(OH)2與固硫灰中的活性SiO2和Al2O3反應，形成了更多的托貝莫來石和C-S-H凝膠，另一方面加速了托貝莫來石和C-S-H凝膠的生長速度，形成了尺寸更大的反應產物；納米C-S-H的摻入降低了蒸壓加氣混凝土中的孔洞率，提高了蒸壓加氣混凝土的密實度和強度；固硫灰中的三種主要物相與Ca(OH)2的蒸壓反應活性大小為薄片疊層狀的黏土礦物熱分解產物最高，帶棱角粒狀的石英顆粒次之，球狀的鋁硅酸鈣物相最低。
Abstract: The effects of nano-C-S-H on properties and hydration products of autoclaved aerated concrete with circulating fluidized bed fly ash were studied by strength, dry density tests and XRD, FTIR and SEM analysis. The results show that the dry density and compressive strength of autoclaved aerated concrete increase first and then decrease with the increase of nano-C-S-H content, and the compressive strength of autoclaved aerated concrete reaches the maximum when the nano-C-S-H content is 3%, which is 13.2% higher than that of blank group. Under the autoclastic curing condition, the addition of nano-C-S-H promotes the reaction of Ca(OH)2 in the system with active SiO2 and Al2O3 in the circulating fluidized bed fly ash, forming more tobermorite and C-S-H gel, and accelerates the growth rate of tobermorite and C-S-H gel, forming reaction products with larger size. The addition of nano-C-S-H reduces the porosity of autoclaved aerated concrete, and improves the density and compressive strength of autoclaved aerated concrete. The autoclaved reaction activity of the three main phases in the circulating fluidized bed fly ash with Ca(OH)2 is that the laminated products of clay are the highest, followed by the angular granular quartz particles, and the spherical phase of calcium aluminosilicate is the lowest.
柏秀奎,林俊豪,曹德光,等.納米C-S-H對固硫灰蒸壓加氣混凝土水化產物形成的影響[J].混凝土與水泥制品,2022(5):72-76.
BAI X K,LIN J H,CAO D G,et al.Effect of Nano-C-S-H on the Formation of Hydration Products of Autoclaved Aerated Concrete with Circulating Fluidized Bed Fly Ash[J].China Concrete and Cement Products,2022(5):72-76.
