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首页> 外文期刊>Construction and Building Materials >Properties of sulfoaluminate cement-based grouting materials modified with LiAl-layered double hydroxides in the presence of PCE superplasticizer
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Properties of sulfoaluminate cement-based grouting materials modified with LiAl-layered double hydroxides in the presence of PCE superplasticizer

机译：在PCE高效减水剂存在下用LiAl层状双氢氧化物改性的硫铝酸盐水泥基灌浆材料的性能

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摘要

Sulfoaluminate (CSA) cement-based grouting materials (CBGM), due to their fast hydration rate and high early strength, can be used in repair and reinforcement projects. To obtain a high workability, CBGM has often been modified by a polycarboxylate ether (PCE) superplasticizer with a high water to binder ratio (>0.5), which results in a poor compressive strength. Nano LiAl-LDH has been reported to have excellent properties for improving the mechanical behavior of sulfoaluminate (CSA) cement clinkers. In addition to the physicochemical characteristics of the nanomaterials, the admixtures used in CBGM paste can also affect the properties of the nanomaterials. In this paper, the effect of the PCE superplasticizer concentration on the properties of CBGM modified with LiAl-LDH was investigated, and a possible reason is provided. The results show that low PCE superplasticizer concentrations (0.9 wt% and 1.15 wt%) increased and high PCE superplasticizer concentrations (1.38 wt%, 1.76 wt% and 2.13 wt%) decreased the compressive strength of a CBGM paste modified with LiAl-LDH in comparison with that of the control paste. The PCE superplasticizer did not intercalate into the interlayers of the LiAl-LDH, and the interaction between the PCE superplasticizer and LiAl-LDH was limited to surface adsorption. A small quantity of lithium ions was released from the precipitation-dissolution equilibrium of LiAl-LDH in the slurry. Lithium atoms can enter the vacant octahedral sites of montmorillonite, which is one component of the CBGM, via isomorphous substitution, and the interaction decreased the adsorption quantity of the PCE superplasticizer on the bentonite surface, resulting in the high fluidity of the CBGM paste in the presence of a high PCE superplasticizer concentration. (C) 2019 Elsevier Ltd. All rights reserved.
机译：硫铝酸盐（CSA）水泥基灌浆材料（CBGM）由于其快速的水合速率和较高的早期强度，可用于维修和加固项目。为了获得较高的可加工性，CBGM通常已通过水/粘合剂比例高（> 0.5）的聚羧酸醚（PCE）高效减水剂进行了改性，导致压缩强度较差。据报道，纳米LiAl-LDH具有优异的性能，可改善硫铝酸盐（CSA）水泥熟料的机械性能。除了纳米材料的物理化学特性外，CBGM糊剂中使用的混合物也会影响纳米材料的性能。本文研究了PCE高效减水剂浓度对LiAl-LDH改性CBGM性能的影响，并提供了可能的原因。结果表明，低浓度的PCE高效减水剂（0.9 wt％和1.15 wt％）增加，而高浓度的PCE高效减水剂（1.38 wt％，1.76 wt％和2.13 wt％）降低了用LiAl-LDH改性的CBGM浆料的抗压强度。与对照糊的比较。 PCE高效减水剂没有插入LiAl-LDH的中间层，并且PCE高效减水剂和LiAl-LDH之间的相互作用仅限于表面吸附。从浆料中的LiAl-LDH的沉淀-溶解平衡中释放出少量的锂离子。锂原子可以通过同晶取代进入CBGM的一种组分蒙脱石的空八面体位点，并且相互作用降低了膨润土表面PCE高效减水剂的吸附量，导致CBGM糊在CBGM中的高流动性。高PCE减水剂浓度的存在。 （C）2019 Elsevier Ltd.保留所有权利。

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