Cement mortar

[0036] The electromagnetic wave shielding material of the cement mortar in Example 1 is composed of graphite, carbon black, iron ore, carbon fiber and iron-based microcrystalline alloy powder. The organic additives of the cement mortar in Example 1 consisted of redispersible latex powder, hydroxypropyl methylcellulose, starch ether and water reducing agent. The cement mortar of Example 1 does not contain wood fibers. The concrete composition of the cement mortar of embodiment 1 is as shown in table 1, and the compressive strength of cement mortar is as shown in table 1, and the shielding effectiveness of cement mortar is as shown in table 1. figure 1 shown.

[0038] The electromagnetic wave shielding material of the cement mortar in Example 2 is composed of graphite, carbon black, iron ore, carbon fiber and iron-based microcrystalline alloy powder. The organic additives of the cement mortar in Example 2 consisted of redispersible latex powder, hydroxypropyl methylcellulose, starch ether and water reducing agent. The concrete composition of the cement mortar of embodiment 2 is as shown in table 1, and the compressive strength of cement mortar is as shown in table 1, and the shielding effectiveness of cement mortar is as shown in table 1. figure 1 shown.

[0040] The electromagnetic wave shielding material of the cement mortar in Example 3 is composed of graphite, carbon black, iron ore and iron-based microcrystalline alloy powder. The organic additives of the cement mortar in Example 3 consisted of redispersible latex powder, hydroxypropylmethylcellulose and starch ether. The concrete composition of the cement mortar of embodiment 3 is as shown in table 1, and the compressive strength of cement mortar is as shown in table 1, and the shielding efficiency of cement mortar is as shown in table 1. figure 1 shown.