The effect of NaOH on dispersing performance of HPEG PCE superplasticizers and early strength was studied in a calcined clay (CC) blended cement (OPC:CC = 70:30 wt./wt.). Activator impact on workability and mechanical properties was investigated on mortar via fluidity and strength tests. The results revealed a time-dependent impact. At early ages (16 h – 3 d), the strength of the NaOH-activated OPC/CC blend exceeds that of OPC, while at longer curing times ( 3 d) it is 30 % below that of OPC. Among the HPEG PCEs tested, the polymer possessing a medium long side chain (n = 50) performed best. Generally, NaOH addition prompted significantly increased PCE dosages. Heat flow calorimetry and in-situ XRD measurements suggest that NaOH promotes initial hydration of both OPC and CC, but later delays OPC reaction. Zeta potential measurements confirmed that NaOH significantly reduces the adsorbed amount of PCE on the binder, thus explaining higher dosage requirement.

中文翻译：

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碱活化煅烧粘土混合水泥：NaOH 活化剂对 HPEG PCE 性能和早期强度的影响


研究了 NaOH 在烧粘土 (CC) 混合水泥（OPC:CC = 70:30 重量/重量）中对 HPEG PCE 超塑化剂分散性能和早期强度的影响。通过流动性和强度测试研究了活化剂对砂浆和易性和机械性能的影响。结果显示出随时间变化的影响。在早期（16 小时 – 3 天），NaOH 激活的 OPC/CC 混合物的强度超过 OPC，而在较长的固化时间（3 天）下，其强度比 OPC 低 30%。在测试的 HPEG PCE 中，具有中长侧链 (n = 50) 的聚合物表现最好。一般来说，NaOH 的添加会显着增加 PCE 的用量。热流量热法和原位 XRD 测量表明，NaOH 促进 OPC 和 CC 的初始水合，但随后延迟 OPC 反应。 Zeta 电位测量证实 NaOH 显着降低了粘合剂上 PCE 的吸附量，从而解释了更高的剂量需求。