Preparation of C-S-H/APC Nanoseed and Its Effect on the Early Strength of Set Cement
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摘要: 水合硅酸钙/聚羧酸纳米晶种（C-S-H/PCE）是一种纳米复合材料，具有成核效应可加速水泥水化反应，提高水泥石早期强度，但常规阴离子型聚羧酸分散剂具有较强的缓凝作用。首先引入甲基丙烯酰氧乙基三甲基氯化铵阳离子单体合成了强分散、弱缓凝的两性离子型聚羧酸分散剂（APC），接着用APC制备了一种高早强性能的水合硅酸钙/两性离子聚羧酸纳米晶种（C-S-H/APC），并对其结构进行了表征。当晶种加量为1%，20 ℃养护时间为6 h、12 h、24 h时，C-S-H/APC水泥石抗压强度较C-S-H/PCE水泥石抗压强度分别高10.8%、8.2%、8.9%。C-S-H/APC晶种水泥石的XRD图中Ca(OH)2衍射峰明显强于空白组，C2S、C3S的衍射峰较空白组低，且有水化产物AFt的衍射峰。水泥石的SEM图显示，空白水泥石水化程度很低，结构疏松，相同养护龄期的纳米C-S-H/APC水泥石结构更加致密，水泥水化程度更高，说明纳米C-S-H/APC提高了水泥水化速率，加快了水化产物空间网络结构的形成，从而提高了水泥石的早期强度。该低温早强剂水泥浆体系性能良好，已在长庆油田鄂尔多斯盆地长6层低温井中得到成功应用。Abstract: Hydrated calcium silicate/polycarboxylic acid nanocrystalline species (C-S-H/PCE) is a kind of nanocomposites with nucleation effect can accelerate the hydration reaction of cement and improve the early strength of cement stone, but the conventional anionic polycarboxylic acid dispersant has strong retarding effect. In this paper, a strongly dispersing and weakly retarding amphoteric polycarboxylic acid dispersant (APC) was firstly synthesized by introducing methacryloyloxyethyltrimethylammonium chloride cationic monomer, and then a hydrated calcium silicate/amphoteric polycarboxylic acid nanocrystalline seed (C-S-H/APC) with high early-strength performance was prepared from the APC, and the structure of the crystal seed was characterized. The compressive strength of C-S-H/APC cementite was 10.8%, 8.2% and 8.9% higher than that of C-S-H/PCE cementite when the addition amount of the crystalline seed was 1%, and the curing time at 20 ℃ was 6 h, 12 h and 24 h. The XRD patterns of C-S-H/APC cementite showed that the Ca(OH)2 diffraction peaks were obviously stronger than that of the blank group, while those of C2S and C3S were lower than that of the blank group, and there were some water-induced and water-soluble peaks in the XRD patterns of the cementite. C2S, C3S, and the diffraction peaks of hydration product AFt were lower than those of the blank group. The SEM image of cement stone shows that the hydration degree of the blank cement stone is very low and the structure is loose, and the structure of the nanometer C-S-H/APC cement stone with the same age of maintenance is denser and the hydration degree of the cement is higher, which indicates that the nanometer C-S-H/APC improves the hydration rate of the cement and accelerates the formation of the spatial network structure of the hydration products, so as to improve the early strength of the cement stone, and the performance of this low-temperature early-strengthening agent slurry system is stable, and it has been used in Changqing Oil Industry. The low-temperature early strength cement slurry performs well and has been successfully applied in the low-temperature wells in the long 6 layers of Ordos Basin of Changqing Oilfield.
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