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Strength of sandy and clayey soils cemented with single and double fluid jet grouting

机译：单，双流体喷射灌浆固结的沙质黏土的强度

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摘要

Innovations in jet grouting technology have primarily focused on the cutting efficiency of the jets, with the aim of creating larger columns and increasing the productivity of construction sites. Relatively little attention has been paid to the consequences of the grouting system on the mechanical properties of the formed material. This paper investigates this aspect by analysing the results of two field trials carried out in both sandy and clayey soils, where single and double fluid jet grouting were simultaneously performed, with varied grout composition and injection parameters. Parallel uniaxial compressive tests on samples cored from the columns show that the material formed with the double system is systematically lower in strength than the material formed using the single fluid system. The mineralogical composition of samples cored from the columns was analysed by performing parallel Scanning Electron Microscopy (SEM), X-ray diffraction analysis (XRD), Differential Thermal Analysis (DTA) and Thermo-Gravimetric Analyses (TGA) to determine the reasons for this difference. A lower proportion of cementitious products, an accelerated carbonation of portlandite and a less homogeneous distribution of cement hydration products was found on the surface of the soil particles of the double samples than for the single fluid columns. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：喷射灌浆技术的创新主要集中在喷射流的切割效率上，目的是创建更大的立柱并提高建筑工地的生产率。相对很少注意注浆系统对成型材料的机械性能的影响。本文通过分析在沙质和黏性土壤中进行的两个田间试验的结果来研究这一方面，在该试验中，在不同的灌浆成分和注入参数的情况下，同时进行了单次和两次流体喷射注浆。对从色谱柱取芯的样品进行的平行单轴压缩试验表明，采用双系统的材料的强度总体上低于使用单流体系统的材料。通过执行平行扫描电子显微镜（SEM），X射线衍射分析（XRD），差示热分析（DTA）和热重分析（TGA）来分析从色谱柱取芯的样品的矿物学组成，以确定其原因区别。与单液柱相比，在双份样品的土壤颗粒表面上发现了较低比例的胶凝产物，加速的碳酸钙碳化和不均匀的水泥水合分布。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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