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Unconfined compressive strength of loose sandy soils grouted with zeolite and cement

机译：沸石和水泥注浆的松散砂土的无侧限抗压强度

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摘要

Cement production requires a lot of energy and is also one of the most important sources of carbon dioxide emissions. Consequently, the replacement of part of the cement with a more environmentally friendly material, such as zeolite, is of great importance. The present research involves the conducting of a series of laboratory tests on loose sand specimens (D-r approximate to 30%) grouted with cementitious materials (cement and zeolite) to investigate the effect of different parameters, such as the size of the sand particles, the ratio of water to cementitious materials (W/CM) and the replacement of a certain percentage of the cement in the grout with zeolite (Z), on the unconfined compressive strength (UCS) of the grouted sand specimens. The results indicate that for all the grout W/CM and sand grain sizes, when Z is increased from zero zeolite (Z(0)), the UCS initially increases. Then, after reaching an optimal amount (Z(30)), it decreases. Moreover, increasing both the size of the sand particles and the W/CM of the grout is seen to reduce the UCS of the grouted specimens. The UCS of the grouted sand specimens increases with the equilibrium of SiO2 and Al2O3 with CaO elements in the grouting suspension. Finally, equations with a high performance are proposed to predict the UCS of sands grouted with zeolite-cement using a multiple regression model (MRM) and a group method of data handling (GMDH)-type neural network. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：水泥生产需要大量能源，也是最重要的二氧化碳排放源之一。因此，用更环保的材料例如沸石代替部分水泥是非常重要的。本研究涉及对用水泥质材料（水泥和沸石）灌浆的疏松砂样（Dr约占30％）进行一系列实验室测试，以研究不同参数（如砂粒的大小，在灌浆砂样品的无侧限抗压强度（UCS）上，水与胶凝材料的比（W / CM）以及用沸石（Z）代替浆液中一定百分比的水泥。结果表明，对于所有水泥浆W / CM和砂粒尺寸，当Z从零沸石（Z（0））开始增加时，UCS最初会增加。然后，在达到最佳量（Z（30））之后，它减小。此外，增加砂粒的尺寸和水泥浆的W / CM可以减少灌浆试样的UCS。灌浆砂样的UCS随灌浆悬浮液中SiO2和Al2O3与CaO元素的平衡而增加。最后，利用多元回归模型（MRM）和数据处理（GMDH）型神经网络的分组方法，提出了一个高性能方程来预测用沸石水泥注浆的砂的UCS。 （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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