Effect on the Resistance of Concrete Acid Corrosion in Superficial Soil Layers

Table 5

The average monthly temperatures of urban and rural soil at different depths.

Date	Average monthly temperatures of urban soil (°C)						Average monthly temperatures of rural soil (°C)						Monthly UHII (0–40 cm)/°C	3-monthly UHII (0–40 cm)/°C	Yearly UHII (0–40 cm)/°C
	0 cm	10 cm	20 cm	30 cm	40 cm	Average (0–40 cm)	0 cm	10 cm	20 cm	30 cm	40 cm	Average (0–40 cm)
2011-04	18.28	19.21	18.6	18.08	17.45	18.32	17.25	16.59	15.82	15.46	14.98	16.02	2.3	1.25	2.51
2011-05	22.85	22.46	21.71	21.29	20.7	21.8	22.05	21.08	20.75	20.43	19.94	20.85	0.95
2011-06	24.78	23.76	23.29	22.91	22.39	23.43	24.17	23.38	22.7	22.41	21.94	22.92	0.51
2011-07	28.12	27.32	26.76	26.24	25.58	26.8	27.76	26.96	26.11	25.69	25.04	26.31	0.49	1.91
2011-08	29.9	29.21	29.19	29.1	28.99	29.28	27.16	26.99	26.48	26.37	25.95	26.59	2.69
2011-09	25.91	25.62	25.88	26.15	26.33	25.98	23.27	23.55	23.35	23.55	23.48	23.44	2.54
2012-10	21.51	21.06	21.52	22	22.42	21.7	16.81	17.86	18.12	18.71	19.04	18.11	3.59	3.61
2012-11	17.79	17.71	18.27	18.81	19.3	18.38	13.34	14.36	14.71	15.37	15.79	14.71	3.67
2012-12	8.46	8.89	10.03	11.02	12.17	10.11	3.69	5.67	6.6	7.84	8.83	6.53	3.58
2012-01	7.01	7.31	8.13	8.86	9.65	8.19	2.88	4.26	4.77	5.62	6.29	4.76	3.43	3.26
2012-02	6.83	6.87	7.53	8.1	8.72	7.61	3.06	4.21	4.54	5.21	5.71	4.55	3.06
2012-03	12.42	11.73	11.75	11.83	11.91	11.93	8.81	8.75	8.47	8.58	8.54	8.63	3.3