复掺OPC全负温碱矿渣砂浆的性能演化及机理分析

Mechanism Analysis and Performance Evolution of Full Negative Temperature Alkali-Activated Slag Mortar with OPC

摘要:

系统研究了硅酸盐水泥（OPC）掺量对全负温（-10 ℃成型及养护）碱矿渣砂浆（AASM）性能的影响规律及作用机制。结果表明：掺入OPC能够提高全负温碱矿渣砂浆的全龄期抗压强度，OPC的最佳掺量为胶凝材料总量的3%，该掺量下碱矿渣砂浆1、7、28 d抗压强度较未掺OPC时分别提升5.0%、23.5%、17.8%；OPC提升了负温下矿渣的水化反应程度，使水化产物生成量增加和微结构致密化，进而增强全负温碱矿渣砂浆抗压强度。

Abstract:

The influence and mechanisms of ordinary Portland cement （OPC） dosage on the performance of full negative temperature（mold and cure at -10 ℃） alkali-activated slag mortar（AASM） were systematically investigated. The results demonstrate that the incorporation of OPC can enhance the full-age compressive strength of AASM cured at full negative temperature， and the optimal OPC dosage is 3% of the total binder mass. Under this dosage， the 1， 7 and 28 d compressive strength of AASM are 5.0%， 23.5% and 17.8% higher than that without OPC， respectively. OPC promotes the hydration degree of slag at negative temperature， leading to an increase in the hydration product amount and densification of the microstructure， thereby improving the compressive strength of AASM cured entirely at negative temperature.