有机改性硫酸钙晶须在沥青改性中的应用

doi:10.19964/j.issn.1006-4990.2023-0265

Abstract

Abstract:

To obtain the modified asphalt with better mechanical properties and improve the pavement performance of traditional matrix asphalt，the application of organically modified calcium sulfate whiskers（CSW），prepared from phosphogypsum，in asphalt modification were systematically studied.Through the materials preparation，analysis and testing，as well as mixture testing，changes of the three main indexes，apparent viscosity，and high-temperature performance of asphalt before and after modification using phosphogypsum and organically modified CSW were analyzed.Furthermore，the pavement performance of different bitumen mixtures was explored.The results indicated that the organic modifiers were mainly acted on the surface of CSW in the form of chemical adsorption.The whisker materials modified with combined organic modifiers were more compatible with asphalt.The introduction of organically modified CSW enhanced the bonding strength between asphalt and whiskers to a certain extent and improved the high-temperature stability，however，its low-temperature performance had been relatively reduced.The results were confirmed furthermore by the Marshall stability tests，freeze-thaw splitting tests，and wheel tracking tests.The water stability and high-temperature stability of the modified asphalt mixtures by phosphogypsum or organically modified CSW were better than those in matrix asphalt，and the pavement performance of the asphalt modified by organically modified CSW became better.

Key words: phosphogypsum, organically modified CSW, modified asphalt, pavement performance

CLC Number:

TQ132.32

CHEN Feng, FENG Kang, LI Ming, SHEN Haojie, TIAN Chengtao, TANG Yuan, LI Zhili, HE Dongsheng. Application of organically modified calcium sulfate whiskers in asphalt modification[J]. Inorganic Chemicals Industry, 2024, 56(3): 125-130.

Figures/Tables 11

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References 18

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级配	筛孔尺寸/mm
级配	16.00	13.20	9.50	4.75	2.36	1.18	0.60	0.30	0.15	0.075
目标上限	100	100	85	68	50	38	28	20	15	8
目标下限	100	90	68	38	25	15	10	7	5	4
设计级配	100	90	81.7	48.6	26.9	20.7	16.6	10.3	5.2	4

掺量/ %	软化点T/℃	针入度/（10^-1 mm）			15 ℃的延展度/cm	针入度指数PI	针入度温度指数AlgPen	相关系数R²	回归系数K	当量软化点T₈₀₀/℃	当量脆点 T_1，2/℃	塑性温度范围△T/℃
掺量/ %	软化点T/℃	15 ℃	25 ℃	30 ℃	15 ℃的延展度/cm	针入度指数PI	针入度温度指数AlgPen	相关系数R²	回归系数K	当量软化点T₈₀₀/℃	当量脆点 T_1，2/℃	塑性温度范围△T/℃
0	48.30	27.5	71.2	125.1	>100	0.425	0.043 5	0.998 1	0.781 4	48.774	-16.142	64.917
2	49.16	24.2	61.2	105.8	63.5	0.920	0.042 4	0.998 2	0.743 1	50.943	-15.658	66.602
4	50.28	20.2	51.1	85.9	60.8	1.235	0.041 7	0.999 2	0.676 7	53.391	-14.329	67.720
6	51.14	17.0	44.6	70.5	44.5	1.415	0.041 3	0.999 8	0.612 7	55.457	-12.918	68.378
8	52.68	14.7	37.6	59.6	43.0	1.730	0.040 6	1.000 0	0.559 4	57.726	-11.828	69.554
10	53.96	12.4	31.8	49.5	38.3	1.910	0.040 2	0.999 6	0.492 2	29.972	-10.274	70.246

掺量/ %	黏温曲线方程	回归系数m	相关系数R²
0	lglg（η×10³）=57.731-21.125 lg（T+273.15）	21.125	0.973
2	lglg（η×10³）=55.225-20.156 lg（T+273.15）	20.156	0.986
4	lglg（η×10³）=53.267-19.382 lg（T+273.15）	19.382	0.998
6	lglg（η×10³）=53.948-19.634 lg（T+273.15）	19.634	0.997
8	lglg（η×10³）=49.723-18.008 lg（T+273.15）	18.008	0.997
10	lglg（η×10³）=48.175-17.403 lg（T+273.15）	17.403	0.998

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Application of organically modified calcium sulfate whiskers in asphalt modification

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