Method for rapidly detecting mixing uniformity of cement-solidified soil

Abstract

Specific elements in the cement are used as tracers of the cement and hydration products, the concentration and distribution of the tracer elements in the solidified soil are rapidly measured throughan X-ray fluorescence spectrometer (XRF), and the mixing uniformity of the cement solidified soil is evaluated by utilizing statistical indexes of the concentration of the tracer elements. According to the detection method provided by the invention, the mixing uniformity of the cement-solidified soil can be rapidly evaluated, so that the field construction is guided, and the mixing quality of thecement-solidified soil is ensured.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a method for quickly evaluating the mixing uniformity of cement-solidified soil. Background technique [0002] In recent years, in order to maintain the navigation and flood control capabilities of the river and improve the living environment of the people, the state has strengthened the management of rivers and lakes. Dredging is the preferred treatment method for river courses, but the silt has high moisture content, low strength and is fluid. When dealing with sludge, there are problems such as large volume, difficult stacking, and difficulty in external transportation. At the same time, in the eastern part of my country, ponds, muddy depressions, dark ponds, deep soft foundations, etc. are often encountered during construction, which significantly increases the construction difficulty and construction cost. For the above-mentioned bad foundations, reinforcement metho...

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Problems solved by technology

[0003] Many scholars have found that due to factors such as poor uniformity of on-site mixing and poor curing conditions, the strength of on-site solidified soil is only 30%-50% of that of indoor solidified soil.

In addition, in the cement-soil mixing pile and in-situ solidification project, the uneven mixing of the solidified soil leads to broken piles and discontinuous piles; there are cement-enriched blocks, unreacted cement ash, or weak soil interlayers in the cement-solidified soil. Quality problems lead to insufficient bearing capacity of the foundation, and even cause engineering accidents in severe cases

[0004] At present, strength is used as an evaluation index for the quality of cement-solidified soil in engineering, but the development of strength requires a certain curing age, and it is difficult to find the mixing quality of solidified soil in time, and the result of this index has a lag

If after 7 days or 28 days, the strength of the cement solidified soil does not meet the engineering requirements, it is difficult to rework and waste a lot of human and material resources

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