Mechanical-strength-growth law and predictive model for cement-stabilized macadam

Cement-Modified Loess Base for Intercity Railways: Mechanical Strength and Influencing Factors Based on the Vertical Vibration Compaction Method

“…Moreover, as the hydration reaction proceeds, the cement clinker is gradually consumed such that the growth of mechanical strength gradually becomes slow. When the cement clinker is exhausted, the mechanical strength no longer increases, i.e., the ultimate strength ( R ∞ ) arising from the physical and physico-chemical action among the cement, water, and loess is obtained [ 21 ]. Based on the CML strength growth curve and law established above, this study assumes that a meaningful strength prediction equation meets the following three boundary conditions: when T = 0, R T = R 0 ; when T = ∞, R T = R ∞ ; R 0 < R ∞ , where T is the CML curing time, day; R T is the CML mechanical strength at curing time T , MPa; R 0 is the initial mechanical strength of CML, MPa; and R ∞ is the ultimate mechanical strength of CML, MPa.…”

“…Equation (4) [ 21 ] is the mechanical strength prediction equation established by the above boundary conditions: …”

“…The VVTE parameters are the most important VVCM information ( Figure 1 ) [ 18 , 21 , 22 , 23 , 26 , 27 , 28 ]. Its working parameters include a vibration frequency of 35 Hz, nominal amplitude of 1.2 mm, vibration force of 7.6 kN, and upper- and lower-system weights of 120 and 180 kg, respectively.…”

“…The optimal moisture content determined by the HCTM is too large, and the maximum dry density too small; the correlation between the strength of specimens formed by SPCM and the actual core strength of the road surface is less than 70% [18]. To solve these problems, Jiang et al studied the effects of compaction method on the mechanical properties of inorganic binder-stabilized materials [18][19][20][21][22][23]. They verified the reliability of VVCM in the compaction of cement-stabilized materials in the laboratory by optimizing the working parameters of the vertical vibration test equipment (VVTE).…”

Performance of Stone Mastic Asphalt Mixtures Fabricated by Different Compaction Methods

“…Road workers in France, Switzerland and other countries have studied the effect of vibration molding by subjecting test specimens to lateral vibrations under a vertical load [16]. Thus far, VVTM has proven successful in designing road surface materials such as dense-graded asphalt mixtures and recycled emulsified asphalt mixtures [17][18][19][20][21], and road base materials such as cement stabilized macadam [22][23][24][25]. All of these materials achieve high road performance.…”