New and Economical Mixing Method of Cement-Admixed Clay for DMM Application

Abstract

The results of unconfined compression and oedometer compression tests confirmed the existence of optimum mixing clay water content for economical and efficient mixing of cement and clay for deep mixing method (DMM) application. A concept supporting the existence of optimum mixing clay water content is presented, and a schematic diagram idealizing the clay-water-air-cement interactions is illustrated. The optimum mixing clay water content (Cw,opt) is defined as the total clay water content of the clay-water-cement mixture that would yield the highest possible improvement in strength of cured cement-admixed clay. Based on the test results presented, the Cw,opt would fall near the liquid limit of the base clay. Significantly, at this optimum mixing water content, only 10% cement by weight is needed instead of the corresponding 17 % in the conventional method of mixing, with consequent 40 % reduction of cement content and cost.

Study on the Effect of Amorphous Silica from Waste Granite Powder on the Strength Development of Cement-Treated Clay for Soft Ground Improvement

“…In extreme conditions of high water contents, a high after-curing void ratio occurs, while in extreme conditions of low water contents, uneven mixing occurs. Lorenzo et al confirmed the existence of an optimum moisture content for mixing clay: about 1.10 times base clay's LL [49]. However, the addition of cement to cement-treated clay leads to an increase in the LL of the clay.…”

Effect Factors on Unconfined Compressive Strength of Soil-Cement Columns: The Case Study of Ba Ria, Vung Tau, Vietnam

“…Portland Cement (PC) is created in a controlled chemical process with the combination of aluminum, calcium, iron, silicon, and other compounds. In order to construct Blended Portland Cement (BPC), an amount of gypsum, and several minerals are mixed with PC or clinker in the hydraulic adhesive process [3,4].…”

“…In these terminologies, the Deep Soil Mixing (DSM) has certain advantages such as: rapid stabilization, accelerated construction in site, higher soil strength at lower cost. Authors in [3][4][5] showed that DSM is suitable for application in some problematic soils, especially expansive soils. Typical DSM has been applied in reclaimed and soft native soils in the transportation sector in Japan [6].…”