19 Questions 4 Answers 0 Followers
Questions related from A.C. Pronk
To my surprise, I still see papers/publications in which 4P bending tests on asphaltic beams were used with a controlled haversine deflection. Nothing wrong as long as you are aware of the fact...
01 January 1970 2,669 0 View
Dear All, It is well known that above 10 Hz in 4PB tests mass inertia forces due moving masses between the two inner clamps and the load cell play a role. Some producers of 4PB devices corrected...
01 January 1970 7,158 0 View
Dear friends, I have attached another paper on loading a concrete slab near an edge. This paper might be of interest to those involved in Westergaard and Pasternak models. Regards Ad
01 January 1970 9,827 0 View
Dear colleagues, around 30 years ago I read a paper in which the boundary condition at the edge of a slab was not formulated properly. According to me, the slabs should move away from each other....
01 January 1970 7,568 0 View
In (asphalt) fatigue the fatigue damage is related to tensile strains and stresses. I like to give another point of view. I "believe" that fatigue damage is firstly related to the Dissipated...
01 January 1970 6,566 0 View
Attached are a short note on the ratio of the shear deflection Vs and the deflection Vb due to pure bending. In the back calculation procedure, it is assumed that this ratio is constant and only...
01 January 1970 8,756 0 View
Dear friends, about three decades ago I was next to asphalt research and also involved in foundation models for rigid pavements. There are three commonly used foundations models: 1) Winkler...
01 January 1970 4,870 0 View
Dear colleagues, I have put a new "report" on the 4PB Platform of Jorge Pais dealing with the A(sphalt) C(ondrete) P(avement) - F(fatigue) model. 5 different fatigue life definitions are...
01 January 1970 1,532 0 View
Dear Friends, I have attached a "last" note on the shear deflection in a 4PB test. I should have written it years ago. The contribution of the shear deflection Vs to the total deflection Vt is...
01 January 1970 9,624 0 View
Dear colleagues, Dissipated energy plays an important role in the analysis of 4PB tests. It is well known that the total deflection Vt in a 4PB test has to be split up into 2 parts (Vb, Vs). The...
01 January 1970 4,881 0 View
Dear colleagues, It is commonly accepted that the total deflection Vt in a 4PB bending test consists of two parts: 1) Deflection Vb due to pure bending and 2) Deflection Vs due to shear forces....
01 January 1970 4,895 2 View
Backcalculation in 4PB tests Dear friends, I'm happy to tell you that the Excel program "Bending & Shear" is finally finished and is available on the 4PB platform...
01 January 1970 208 0 View
Dear friends, The Excel program B&S on the 4PB platform (https://www.civil.uminho.pt/4pb/excel.htm) is replaced by a renewed version. The main difference is the calculation of the deflection...
01 January 1970 4,770 0 View
Dear research colleagues, On the 4PB Platform site (http://www.civil.uminho.pt/4pb/acp-f-model.htm) I have placed two new documents on the application of the ACP-F model for 4PB tests. The first...
01 January 1970 8,369 0 View
The Pasternak foundation can be seen as a Winkler foundation in which (shear) forces take care of a horizontal force transfer. The late Prof. Arnold Kerr described it as an elastic shear layer...
Dear colleagues, In many papers, dealing with the VECD model, it is stated that fatigue damage in e.g. 4PB tests are caused by the change in dissipated energy between two repetitions. This in a...
01 January 1970 3,706 0 View
An outlier? Sometimes you get outliers in the data that you don't expect. Checking the data and sources doesn't lead to a satisfying answer. In a 4PB test, I encounter this problem. I have written...
01 January 1970 8,476 3 View
Dear colleagues, Recently I got 4PB data carried out with a (old) IPC UTM 21 V2.01 device. To my surprise, a nasty error occurred in the csv output file. I have attached a short note on this...
01 January 1970 2,398 0 View
Fatigue life Nf,50 & too early stops in 4PB tests Dear colleagues, Some time ago I raised a question about the validity of the traditional fatigue life definition Nf,50. Recently I examined...
01 January 1970 8,597 0 View
