X. HUANG et al.: PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE
175–180
PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN
COLD PATCHING MIXTURE
PRIPRAVA IN RAZISKAVA EPOKSIDNE ME[ANICE
MODIFICIRANE S POLIURETANSKIM PREDPOLIMEROM ZA
HLADNO KRPANJE LUKENJ
Xiaofeng Huang
1
, Junhui Luo
1
, Pengfei Tang
2*
, Cheng Xie
1
, Jiangcai Chen
1
1
Guangxi Beitou Transportation Maintenance Technology Group Co., Ltd., Nanning, China
2
Guangxi Communications Design Group Co., Ltd., Nanning, China
Prejem rokopisa – received: 2023-01-16; sprejem za objavo – accepted for publication: 2023-02-21
doi:10.17222/mit.2023.748
Focusing on the problems of low strength and insufficient water stability of the cold patch mixture for asphalt pavement,
a polyether polyurethane prepolymer with high activity was prepared in this experiment, and then the epoxy resin was modified
with the prepolymer to prepare a kind of epoxy-resin-mixture pothole-repair material with high strength and high toughness.
The content of polyurethane prepolymer was optimized using a low-temperature tensile test and a normal-environment-condi-
tion mechanical test, and the mechanical properties and road performance of the PU-modified epoxy-resin mixture were studied
with a rutting test, bending test, Cantabro scattering and a splitting test. The results show that PU prepolymer-modified epoxy
resin can effectively increase the toughness and strength of the binder, and that the toughness and mechanical properties of
20 phr PU prepolymer are the best. The road performance of the PU-modified epoxy-resin cold patch mixture is excellent. There
is little difference between the immersion scattering loss rate and the standard loss rate, and both are less than 4 %, indicating
that the mixture has excellent anti-scattering and water-loss performance. It is very suitable as a cold patch material for pave-
ment pits. Due to its comprehensive road performance and reasonable price, the use of the PU-modified epoxy resin binder con-
tent of4%isrecommended.
Keywords: asphalt pavement, pothole repair, polyurethane prepolymer, epoxy resin, road performance
V ~lanku je opisano re{evanje problemov, ki se nana{ajo na slabo trnost in nezadovoljivo odpornost proti vodi oz. slabo
stabilnost me{anic za krpanje lukenj v asfaltiranih plo~nikih in cestah. V ta namen so pripravili poliuretanski predpolimer (PU)
z visoko aktivnostjo. Epoksidno smolo so modificirali s poliuretanskim predpolimerom z namenom pridobitve materiala
z visoko trdnostjo in `ilavostjo, primernega za krpanje lukenj na asfaltiranih cestah in plo~nikih. Vsebnost poliuretanskega
predpolimera so optimizirali s pomo~jo eksperimentalnih preizkusov dolo~evanja natezne trdnosti pri nizkih in normalnih
temperaturah okolice, kakor tudi dolo~evanja mehanskih lastnosti povezanih s karakteristikami cesti{~. Epoksidno me{anico
modificirano s poliuretanskim predpolimerom so analizirali s pomo~jo testov izmeni~nega tla~nega in upogibnega obreme-
njevanja, testa abrazivne obrabe (Cantabro test) in cepilnega testa. Rezultati so pokazali, da epoksidna smola modificirana s
poliuretanskim predpolimerom u~inkovito pove~a `ilavost in trdnost veziva. Najbolj{e mehanske lastnosti so dosegli z 20 phr
poliuretanskim predpolimerom. Stabilnost izdelane me{anice za hladno krpanje lukenj na cesti{~u je bila odli~na. Opazili so
rahlo razliko med abrazivnimi izgubami med potaplajanjem in standardnimi izgubami zaradi obrabe (v obeh primerih manj kot
4 %), kar ka`e na to da ima izdelana me{anica dobro odpornost proti izpiranju z vodo. Me{anica je tako zelo primerna tudi za
hladno krpanje lukenj nastalih na asfaltiranih plo~nikih. Tudi cenovno je izdelana me{anica s 4 % veziva sprejemljiva glede na
dose`ene lastnosti popravljenega cesti{~a.
Klju~ne besede: asfaltni plo~nik; popravilo lukenj na cestah; poliuretanski predpolimer; epoksidna smola; lastnosti cesti{~a
1 INTRODUCTION
Asphalt pavement is a common form of pavement.
However, the temperature stability of asphalt is poor, and
asphalt pavement is susceptible to cracks, potholes and
ruts due to the influence of external environment. Pot-
hole is typical damage of asphalt pavement with a great
influence on the pavement performance and driving
safety. Once a pothole is formed, it must be repaired in
time.
1,2
Asphalt pavement potholes are one of the most com-
mon and difficult problems of daily maintenance. Espe-
cially in the low-temperature and rainy season, conven-
tional hot mixes cannot repair potholes in a timely and
effective manner,
3
so the repair material used is still
mainly cold patch material. However, in practical appli-
cations, it is found that the potholes repaired with a cold
patch mixture have low forming strength under traffic
load, insufficient durability, and are prone to loosening
again, thus often requiring new repairs.
4,5
Therefore, a
high-performance pothole repair material is urgently
needed in the field of road engineering.
Epoxy resin materials exhibit advantages such as
good chemical stability, strong viscosity, high mechani-
cal strength and low shrinkage due to their unique
three-dimensional network structure and special func-
tional groups.
6,7
However, a cured epoxy resin adhesive
has insufficient toughness and poor impact resistance,
which limit the application of epoxy resin in road con-
Materiali in tehnologije / Materials and technology 57 (2023) 2, 175–180 175
UDK 625.765 ISSN 1580-2949
Original scientific article/Izvirni znanstveni ~lanek MTAEC9, 57(2)175(2023)
*Corresponding author's e-mail:
xiaophenix@163.com (Pengfei Tang)

crete.
8
Therefore, a toughening modification of epoxy
resin is an important way of improving its comprehen-
siveness and expand its application. Polyurethane materi-
als are widely used in road engineering due to their ex-
cellent physical and chemical properties.
9,10
Polyurethane
also has a unique three-dimensional network structure of
a polymer. Because of this special structure polyurethane
can have a toughening effect due to the absorption and
dispersion of energy,
11,12
while polyurethane and epoxy
resin exhibit compatibility so that their mixture can mod-
ify and improve the toughness of a cured epoxy resin ad-
hesive.
13
M. Liu et al.
14
prepared a PU prepolymer-modi-
fied epoxy polymer with the microcapsule technology
and polymer reinforcement technology. It was found that
the cold patch material had a good repair effect in winter
and rainy seasons, and could allow rapid repair of pits
under low temperatures and humid conditions. There-
fore, PU prepolymer-modified epoxy resin can be con-
sidered as a cold patch raw material for research.
In this research, a polyether polyurethane prepolymer
with high activity was first prepared with the blending
method, and then the epoxy resin was modified with the
prepolymer to obtain a modified epoxy resin with a poly-
urethane branched-chain structure. At the same time, ap-
propriate curing agents, a diluent and toughening agents
were selected to obtain a kind of asphalt-mixture pothole
repair material with high strength and high toughness.
The mechanical properties and road performance of the
PU(polyurethane)-modified epoxy resin mixture were
studied with a rutting test, bending test, Cantabro test,
and splitting test. This material has an important engi-
neering practical value and broad application prospects,
promoting the development of the asphalt pavement
maintenance technology, improving pavement perfor-
mance, extending pavement service life, and reducing
pavement maintenance costs.
2 RAW MATERIALS AND TESTING
2.1 Preparation of PU-prepolymer
First, a certain amount of polyether polyols was
weighed, heated in an oil bath to 100 °C, and stirred for
1 h at a stirring rate of 80 min
–1
; then methylene diphenyl
diisocyanate (MDI) was added under the protection of
nitrogen, and after cooling down to room temperature the
mixture was kept for1hataconstant temperature; fi-
nally, a certain amount of chain extender butanediol and
crosslinking agent trimethylolpropane were added and
stirred evenly to prepare the thermoplastic PU-prepoly-
mer.
2.2 Preparation of the PU-modified epoxy resin binder
In accordance with the specific ratio, a certain
amount of epoxy resin E-51 was weighed, PU prepoly-
mer was added, and PU-modified epoxy resin was pre-
pared by heating the mixture at 80 °C for 2 h. Then the
butyl glycidyl ether active diluent, polythiol curing
agent, and catalyst DMP-30 were added, and the
PU-modified epoxy resin binder was prepared by stir-
ring. The obtained binder was PU-modified epoxy resin
binder.
2.3 Preparation of the PU-modified epoxy resin cold
patch mixture
The gradation design (AC-13) shown in Figure 1 was
adopted. The coarse and fine aggregates were limestone,
and the mineral powder was a ground limestone powder,
which was stirred evenly to prepare a gravel mixture.
Then the prepared PU-modified epoxy resin binder and
gravel mixture were stirred for 6 min, and finally the
PU-modified epoxy resin mixture was obtained.
2.4 Preparation of the PU-prepolymer
Dumbbell tensile specimens were prepared according
to T 2567-2008. The prepared PU-modified epoxy resin
binder was slowly poured into a mould coated with a re-
lease agent, and demoulded after curing. The tensile test
was carried out with a universal testing machine at a
temperature of –10 °C and a tensile speed of 5 mm/min.
Three parallel specimens were used in each group, and
the test results were averaged.
2.5 Uniaxial compression and oblique shear tests
According to T 0713-2000, a cylindrical specimen
with a diameter of 100 mm and a height of 100 mm was
formed with the static pressure method. After forming,
the demoulded specimen was kept in an environmental
box at 25 °C until it was completely cured. Then the
specimen was placed in a constant-temperature water
tank at 15 °C for 4 h. Finally, a uniaxial compression test
was carried out using the universal testing machine. The
loading rate was 2 mm/min and the test temperature was
X. HUANG et al.: PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE
176 Materiali in tehnologije / Materials and technology 57 (2023) 2, 175–180
Figure 1: Mixture gradation curve

15 °C. Three parallel specimens were used in each
group, and the test results were averaged.
The oblique shear test was used to cut an asphalt con-
crete rut plate specimen into (50 × 50 × 50) mm cube
specimens. The roll-formed surfaces of two cube speci-
mens were spliced, and a 5-mm crack was kept in the
middle so that the PU-modified epoxy resin binder was
poured into it. After the binder was completely cured,
the specimen was placed in the environmental box at
25 °C for 4 h. The 45 ° oblique shear test was used to
test the interfacial shear-bonding performance. The test
temperature was 25 °C and the loading rate was
10 mm/min.
2.6 Rutting test
According to T 0719-2011, another rut-plate speci-
men (300 × 300 × 50) mm was formed and cured in the
25 °C environmental box for 28 d. The test temperature
was 60 °C, the wheel pressure was 0.7 MPa, and the dy-
namic stability of the mixture specimen was calculated
after the rutting deformation formed in 45 min and
60 min.
2.7 Low-temperature bending test
According to T 0715-2011, rutting-plate specimens
were formed and cured at 25 °C for 28 days. After a rut-
ting plate was demoulded, it was cut into (250 × 30 ×
35) mm trabecular specimens and kept at –10 °C for 4 h.
The test temperature was –10 °C and the loading rate
was 50 mm/min.
2.8 Splitting test
Standard Marshall specimens were prepared accord-
ing to T 0716-2011. They were compacted 50 times on
both sides. The diameter of the specimens was
 101.6 ± 0.2 mm and the height was 63.5 mm ± 1.3 mm.
A Marshall test block was immersed in water for1hand
then split by the universal testing machine.
2.9 Cantabro test
According to T 0733-2011, the Marshall specimens
were immersed in the constant-temperature water tank at
20 °C for 20 h. During a standard scattering test, the
specimens were immersed in the constant-temperature
water tank at 60 °C for 48 h, and then kept at room tem-
perature for 24 h. The Los Angeles wear test was used to
test the standard-scattering loss rate and immersion-scat-
tering loss rate. The Los Angeles testing machine made
300 revolutions at a speed of 32 min
–1
.
2.10 Construction process
The construction process for the prepared pothole
cold filling mixture is shown in Figure 2.
3 RESULT AND DISCUSSION
3.1 Determination of PU Content
According to the previous experiments of the re-
search team, the amount of epoxy resin was determined
to be 100 phr, the amount of the curing agent was 50 phr,
the amount of the diluent was 60 phr, and the amount of
the accelerator was 4 phr. Considering the tensile
strength and elongation at break at –10 °C (Figure 3)
and the compressive strength and oblique shear bond
strength at 25 °C (Figure 4), the amount of PU was opti-
mized.
It can be seen from Figure 3 that with an increase in
the polyurethane prepolymer content, the tensile strength
X. HUANG et al.: PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE
Materiali in tehnologije / Materials and technology 57 (2023) 2, 175–180 177
Figure 3: Tensile strength and elongation at break at –10 °C
Figure 2: Construction of PU-modified epoxy resin cold patch mixture

of the binder increases first and then decreases. When
the amount of polyurethane prepolymer is 20 %, the ten-
sile strength peaks at 45.68 MPa. The elongation at break
increases with the content of polyurethane prepolymer,
but when the content of polyurethane prepolymer ex-
ceeds 20 phr, the elongation at break increases slightly.
After adding polyurethane prepolymer-modified epoxy
resin, the tensile strength and elongation at break of the
binder are greatly improved. Obviously, the unmodified
epoxy resin binder shows that the use of polyurethane
prepolymer-modified epoxy resin can greatly enhance
the toughness of the epoxy resin binder. However, the
toughness improvement of adhesive materials should not
be at the expense of other mechanical properties. In this
research, in order to explore whether the addition of
polyurethane prepolymer will reduce the mechanical
properties and bonding properties of the binder, the com-
pressive strength and oblique shear bonding strength are
used for the analysis.
From Figure 4, it can be seen that the compressive
strength of the cured product of the unmodified epoxy
resin is relatively the lowest, which is 60.5 MPa. After
adding polyurethane prepolymer, the compressive
strength of the modified epoxy resin is higher than
67 MPa, and the compressive strength increases with the
increase in the amount of polyurethane. It first increases
and then decreases, reaching a maximum of 76 MPa
when the amount of PU is 20 phr. It can also be seen
from Figure 4 that the oblique shear bond strength of the
unmodified epoxy resin is 1.98 MPa, which is less than
the bond strength of the other samples. At the same time,
with the increase in the PU prepolymer content, the
oblique shear bond strength of the modified epoxy resin
also shows a trend of first increasing and then decreas-
ing, reaching a maximum value of 3.02 MPa when the
PU prepolymer content is 20 %. That is, with the im-
provement in the toughness of the epoxy resin adhesive
material, its compressive strength and bond strength are
not affected, but they are improved to varying degrees.
Combining the tensile strength and elongation at
break at –10 °C and the compressive strength and
oblique shear bond strength at 25 °C, it can be seen that
the polyurethane prepolymer-modified epoxy resin can
effectively increase the toughness and strength of the
binder. In addition, the toughness and mechanical prop-
erties of the 20 phr PU polyurethane prepolymer are the
best, so 20 phr polyurethane is used in this research.
Finally, the epoxy resin : PU prepolymer : diluent : cur-
ing agent : accelerator ratio of 100 : 20 : 60 : 50:4is
used.
3.2 Road performance of the cold patch mixture
3.2.1 High-temperature stability
In order to study the high-temperature performance
of the PU-modified epoxy resin cold patch mixture, a
60 °C rutting test was used. The PU-modified epoxy
resin binder was 3.0 %, 3.5 %, 4.0 %, 4.5 % and 5.0 %.
The test results are shown in Table 1.
It can be seen from Table 1 that within the range of
the binder content selected for the test, the deformation
of the mixture specimen decreases with the increase in
the binder content, and the dynamic stability gradually
increases. This is because the increase in the binder im-
proves the overall density of the mixture, while the bind-
ing effect of the binder gradually increases. However,
when the content exceeds 4 %, the increase in the binder
content has no significant effect on the high-temperature
performance of the mixture. When the binder content is
3 %, the dynamic stability is 25850 times/mm, which is
much larger than the requirement that the dynamic sta-
bility of the modified SMA mixture is not less than 3000
times/mm, as specified in the Technical Specification for
the Construction of Highway Asphalt Pavement (JTG
F40-2004).
It can be seen from the above data that, compared
with the asphalt mixture, the PU-modified epoxy resin
cold patch mixture exhibits a large dynamic stability and
small deformation under high-temperature and load, and
X. HUANG et al.: PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE
178 Materiali in tehnologije / Materials and technology 57 (2023) 2, 175–180
Figure 4: Compressive strength and oblique shear bond strength
Table 1: Rutting test results for PU-modified epoxy resin cold patch mixture
Binder content (%) 3.0 3.5 4.0 4.5 5.0
45 min deformation (mm) 0.521 0.326 0.235 0.215 0.213
60 min deformation (mm) 0.546 0.334 0.257 0.220 0.219
Dynamic stability (times/mm) 25850 53750 74500 86500 98000
Specification requirements
(times/mm)
Normal asphalt mixture 1000
Modified SMA asphalt mixture 3000

has excellent high temperature deformation resistance.
This is because asphalt materials are temperature-sensi-
tive thermoplastic materials, exhibiting a soft flow when
the temperature rises and being prone to high-tempera-
ture rutting damage. The resin material is a thermoset-
ting material, and its curing process is irreversible. Even
in high-temperature conditions, there is no flow phenom-
enon. Therefore, the high temperature stability of the
PU-modified epoxy resin cold patch mixture is good.
3.2.2 Low-temperature crack resistance
Asphalt materials are brittle in winter, and transverse
cracks in asphalt pavement are mostly caused by
low-temperature cracking of asphalt. Therefore, the
pavement pit repair material must have low-temperature
crack resistance to ensure that a repaired pavement has a
certain anti-deformation ability and can avoid low-tem-
perature shrinkage cracks. Therefore, this research uses a
low-temperature bending test to evaluate its low-temper-
ature performance with flexural strength and flexural
strain. The test results are shown in Table 2.
Table 2: Low-temperature bending test results
Binder
content
(%)
Break-
ing load
(kN)
Mid-de-
flection
(mm)
Bending
tensile
strength
(MPa)
Bending
tensile
strain (με)
Stiffness
modulus
(MPa)
3.0 2.917 0.389 23.75 2256 10385
3.5 2.798 0.416 23.01 2455 9850
4.0 2.679 0.452 22.11 2694 8075
4.5 2.501 0.472 21.53 2917 7350
5.0 2.422 0.497 19.89 3018 6780
It can be seen from Table 2 that the low-temperature
flexural tensile strength of the PU-modified epoxy resin
cold patch mixture decreases with the increase in the
binder content, but it is still 19.89 MPa at the 5 % con-
tent. On the one hand, this is due to the high strength of
the PU-modified epoxy resin binder; on the other hand, it
is due to the strong bonding capacity of the PU-modified
epoxy resin binder, and the high bond strength between
the aggregates, resulting in a high overall strength of the
cold patch mixture.
The flexural strain of the mixture increases with the
increase in the binder because the higher the binder con-
tent, the thicker is the binder film formed on the surface
of the mineral. This fully enhances the toughness of the
PU-modified epoxy resin, thereby improving the overall
deformation capacity. When the content of the binder is
3 %, the bending strain is the smallest, which is 2256 με,
but it still meets the requirement of JTG F40-2004 that
the bending strain of an ordinary asphalt mixture in a
cold winter region is not less than 2000 με. When the
binder content is 4.0 %, the flexural strain is 2694 με,
which meets the requirement that the flexural strain of an
ordinary asphalt mixture in a cold winter region is not
less than 2600 με. It can be seen that when the binder
content is 4.0 %, the PU-modified epoxy resin cold patch
mixture is suitable for most areas.
3.2.3 Water stability
Traditional pavement cold patch materials such as
solvent-based cold patch mixtures and emulsion-based
cold patch mixtures use asphalt materials as binders. The
presence of water affects the adhesion between the ag-
gregate and asphalt, and generates hydrodynamic pres-
sure under the repeated action of the vehicle load,
thereby causing water damage. The pavement itself,
when needing to be repaired, is the weakest link in the
pavement structure. If secondary damage occurs due to
water damage, the performance of the pavement is seri-
ously affected. Therefore, the 25 °C splitting strength
and Cantabro scattering loss rate were used to evaluate
the water stability and water damage resistance of the
PU-modified epoxy resin mixture. The test results are
shown in Table 3.
Table 3: Splitting strength and scattering loss rate for different mix-
tures
Binder content
(%)
Splitting
strength (MPa)
Standard scat-
tering loss rate
(%)
Immersion
scattering loss
rate (%)
3.0 0.98 3.94 3.97
3.5 1.27 3.10 3.18
4.0 1.45 2.53 2.56
4.5 1.51 2.32 2.33
5.0 1.56 2.30 2.30
It can be seen from Table 3 that the splitting strength
of the mixtures with different binder contents after being
soaked for 1 h is greater than 0.98 MPa, and the splitting
strength gradually increases with the increase in the
binder content. When the content of the PU prepolymer
is 5 %, the splitting strength of the mixture reaches the
maximum (1.56 MPa). This shows that the higher the
binder content, the higher is the bond strength of the pre-
pared mixture under water.
It can also be seen from Table 3 that the mass loss
rate obtained with the Cantabro standard dispersion test
and the immersion dispersion test is less than 4 %, and
the dispersion loss rate decreases with the increase in the
binder content. This is because the greater the amount of
the binder, the thicker is the PU-modified epoxy resin
binder film after the curing crosslinking reaction, en-
hancing the bonding with the aggregate, while water
molecules are difficult to aggregate, causing the peeling
of the binder. On the whole, there is little difference be-
tween the immersion loss rate and the standard loss rate,
especially when the binder content is more than 4 %
when the immersion loss rate is almost equal to the stan-
dard loss rate. This is because the mixture porosity de-
creases with the increase in the binder content, and due
to the high overall density of the mixture, water mole-
cules do not easily enter the interior of the specimen, so
the immersion scattering loss rate is close to the standard
X. HUANG et al.: PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE
Materiali in tehnologije / Materials and technology 57 (2023) 2, 175–180 179

scattering loss rate. Overall, the PU-modified epoxy
resin binder has excellent water stability.
Based on the above results, it can be seen that the
PU-modified epoxy resin mixture exhibits excellent road
performance and good anti-scattering performance. It
can also be used in the rainy season, and it is very suit-
able for cold patching pavement pits. When the content
of the PU-modified epoxy resin binder is 4 %, the perfor-
mance of the mixture is very cost-effective.
4 CONCLUSIONS
In this research, a polyether polyurethane prepolymer
with high activity was prepared, and then epoxy resin
was modified with the prepolymer. At the same time, a
suitable curing agent, diluent, and toughening agent were
selected to prepare an asphalt mixture pothole repair ma-
terial with high strength and toughness. The content of
the polyurethane prepolymer in the binder was optimized
through a low-temperature tensile test and room-temper-
ature mechanical test. The mechanical properties and
road performance of the PU-modified epoxy resin mix-
ture were studied with a rutting test, bending test,
Cantabro scattering and splitting test. The main conclu-
sions are as follows:
(1) Combining the tensile strength and elongation at
break at –10 °C and the compressive strength and
oblique shear bond strength at 25 °C, it can be seen that
the PU prepolymer-modified epoxy resin can effectively
increase the toughness and strength of the binder. In ad-
dition, the toughness and mechanical properties of the
20 phr content of PU prepolymer are the best. The ratio
of the components of the PU-modified epoxy resin
binder including epoxy resin : PU prepolymer : diluent :
curing agent : accelerator is 100 : 20 : 60 : 50 : 4.
(2) The high-temperature stability of the PU-modi-
fied epoxy resin cold patch mixture is better with an in-
crease in the binder content, but when the content ex-
ceeds 4 %, the increase has no significant effect on the
high-temperature performance of the mixture. The
low-temperature flexural tensile strength of the mixture
decreases with the increase in the binder content, but it is
still 19.89 MPa at the 5 % content. The bending strain in-
creases when the binder content is more than 4 %, so the
PU-modified epoxy resin cold patch mixture is suitable
for most areas. With the increase in the binder content,
the immersion splitting strength of the mixture increases
gradually. The Cantabro standard scattering loss and im-
mersion scattering loss decrease with the increase in the
binder content. On the whole, there is little difference be-
tween the immersion scattering loss rate and standard
scattering loss rate, and both are less than 4 %, indicating
that the mixture has excellent resistance to scattering and
water loss.
(3) The road performance of the PU-modified epoxy
resin mixture is excellent, and it also exhibits good
anti-scattering performance. It is very suitable as a cold
patch for pavement potholes. Due to its comprehensive
road performance and reasonable price, we recommend
the PU-modified epoxy resin binder content of 4 %.
Acknowledgements
The authors are grateful for the financial support
from the Key Research and Development Plan – Trans-
portation Infrastructure – Key Special Projects of China
(2022YFB2601900) and Key Technology Projects in
Transportation Industry (2022-ZD4-051).
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